WEIDMULLER

Weidmüller Solar PV Combiner Boxes, Surge Protection & Electrical Components – European B2B Supply

Weidmüller is a German industrial connectivity and electrical engineering manufacturer specialising in photovoltaic protection, DC connectivity, electrical distribution, industrial communication and monitoring systems for residential, commercial and utility-scale solar installations.

Headquartered in Detmold, Germany, Weidmüller develops electrical components that connect, protect and monitor modern photovoltaic systems. Its portfolio includes PV Next combiner boxes, PV Protect surge protection boxes, PV Inline, VARITECTOR lightning and surge protection, PV-Stick connectors, WM4 C photovoltaic connectors, PV Next Fireman Switches and utility-scale string monitoring systems.

Unlike manufacturers primarily focused on solar panels, hybrid inverters or solar batteries, Weidmüller concentrates on the electrical infrastructure surrounding these technologies.

For professional solar installers, electricians, EPC contractors and solar PV system integrators, these components support reliable connections between photovoltaic strings, inverters, distribution equipment and monitoring systems.

At 3Buy Solar, we support European B2B customers with solar PV equipment procurement, electrical balance-of-system (BOS) components and complete installation requirements.

Professional buyers seeking Weidmüller products can submit the exact manufacturer order number, required quantity, technical documentation and destination country for a project-specific sourcing enquiry.

Request a Weidmüller B2B Quotation – Contact 3Buy Solar

Individual Weidmüller SKUs are not currently published in our online product catalogue. Product availability, purchasing conditions and delivery arrangements must therefore be confirmed before ordering.

Shop Related Solar PV & Electrical Components

• Solar PV & ESS Combiner Boxes
• Solar PV Protection & Disconnectors
• PV Connectors & MC4-Type Connectors
• Solar Cables & Wiring
• DC Isolators & PV Disconnect Switches
• Complete Solar PV Kits

Weidmüller Photovoltaic Technology – Connect, Protect & Monitor

Weidmüller’s photovoltaic portfolio is built around three important functions: establishing reliable electrical connections, protecting equipment against electrical faults and transients, and monitoring PV system performance.

Its main technology families include:

These components can be specified individually or incorporated into a coordinated electrical BOS package.

For installers, correct component selection helps reduce unsuitable connections, avoidable equipment failures, installation delays and unnecessary maintenance.

A complete photovoltaic system is only as reliable as its electrical connections, protection devices and installation quality.

Weidmüller PV Next – Professional Solar PV Combiner Boxes

The Weidmüller PV Next is a modular photovoltaic combiner box platform developed for residential and commercial rooftop solar installations.

According to Weidmüller, PV Next uses a standardised printed circuit board (PCB) design with integrated PUSH IN connection technology.

The manufacturer reports a 25% reduction in copper and plastic material use compared with its referenced conventional design.

The concept provides different preconfigured electrical arrangements for combining PV strings, incorporating surge protection and adding optional switching functions.

Why Use Weidmüller PV Next?

Professional installers use PV combiner boxes to organise photovoltaic DC circuits between solar panels and solar inverter inputs.

Depending on the selected model, a PV Next box can provide:

• Photovoltaic string aggregation
• DC surge protection
• Optional gPV fuse protection
• Optional DC switch disconnection
• PUSH IN conductor connections
• WM4 C PV connector interfaces
• Cable-gland connection options
• Outdoor-rated protective enclosures
• Clearly defined input/output arrangements
• Preassembled and documented electrical architecture

Not every PV Next model includes all these functions. The exact product configuration is identified by its manufacturer designation and order number.

Weidmüller PV Next Product Comparison – Manufacturer Order Numbers

The following are verified examples from Weidmüller’s official product catalogue.

These examples have a manufacturer-specified rated DC voltage of 1,100V. Their connection current ratings, enclosure specifications and installation requirements differ.

Product 2791940000 – PV Next 1 MPPT / 2 Inputs / 1 Output

Model: PVN DC 2I 1O 1MPP SPD2R WM4 11

This is a rooftop PV combiner box with:

• One MPPT group
• Two DC string inputs
• One combined output
• Type II surge protection
• WM4 C connector interfaces
• 1,100V rated DC voltage
• Maximum current per MPPT of 30A
• IP65 enclosure protection

It is relevant to appropriately designed inverter arrangements where two PV strings are combined before connection to one MPPT input.

Official Product & Technical Datasheet – Weidmüller 2791940000

Product 2866350000 – PV Next 2 MPPT / Type II SPD

Model: PVN DC 2I 1O 2MPP SPD2R WM4 11

This configuration provides:

• Two independently tracked MPPT groups
• Two string inputs per MPPT
• One output per MPPT
• Type II surge protection
• 1,100V rated DC voltage
• 35A maximum current per MPPT
• WM4 C connectors
• IP65 enclosure protection

The separate MPPT paths are relevant for solar installations with multiple independently tracked photovoltaic groups.

Official Product & Technical Datasheet – Weidmüller 2866350000

Product 2890480000 – PV Next with Type I+II SPD & DC Switch

Model: PVN DC 3I 3O 2MPP SW SPD1R WM4 11

This configuration includes:

• Two MPPT groups
• Three inputs and three outputs per MPPT
• Combined Type I+II surge protection
• Integrated switch disconnector
• WM4 C connector interface
• 1,100V rated DC voltage

This arrangement is relevant where the project requires separate PV string connections, defined DC switching and a higher surge protection category.

Official Product & Technical Datasheet – Weidmüller 2890480000

Product 2778880000 – PV Next Remote Disconnection

Model: PVN DC 2I 1O 2MPP RD WM4 11

The manufacturer identifies this configuration as a PV Next fireman switch featuring:

• Two MPPT groups
• Two inputs per MPPT
• One output per MPPT
• Remote disconnection
• WM4 C connection interface
• 1,100V rated DC voltage

Official Product & Technical Datasheet – Weidmüller 2778880000

Understanding PV Next Model Designations

Weidmüller model designations communicate the intended electrical arrangement.

For example:

PVN DC 2I 1O 2MPP SPD2R WM4 11

• PVN: PV Next
• DC: Photovoltaic DC application
• 2I: Two string inputs per MPPT
• 1O: One output per MPPT
• 2MPP: Two MPPT groups
• SPD2R: Type II surge protection configuration
• WM4: WM4 C connector interface
• 11: Product voltage designation corresponding to the listed 1,100V class

Model suffixes should always be interpreted using the specific manufacturer datasheet.

PV Next Is Not a Universal Combiner Box

A 1,100V combiner box must not be used on a photovoltaic circuit whose maximum design voltage exceeds the device rating.

Likewise, a box with two MPPT groups should not be assumed suitable for a three- or four-MPPT inverter without evaluating the complete electrical configuration.

Technical compatibility depends on actual voltage, current, input/output arrangement, protection requirements and connector interfaces—not simply the inverter manufacturer or nominal AC power.

Weidmüller PV Next Compatibility – Matching Combiner Boxes to Solar Inverters

One of the most important procurement considerations is matching the combiner box to the selected solar inverter and photovoltaic array.

Weidmüller provides a dedicated PV Next inverter matching and selection guide.

This helps installers identify suitable PV Next configurations for common inverter and string arrangements.

What Must Be Matched?

Before ordering a combiner box, verify:

1. Exact solar inverter model
2. Number of MPPT trackers
3. Number of PV strings connected to each MPPT
4. Maximum PV system voltage
5. PV module short-circuit current
6. Maximum current per inverter input
7. Required string aggregation
8. Required fuse protection
9. Surge protection class
10. Required DC isolation
11. Connector manufacturer and type
12. Installation environment

Example – Three-Phase Hybrid Inverter with Three MPPTs

Consider a three-phase hybrid inverter with three independent MPPT trackers.

If each tracker receives two parallel PV strings, the protection equipment must support the intended six input connections and three independently tracked electrical groups.

A one-MPPT or two-MPPT combiner box is not automatically suitable.

The installer should therefore select a properly rated three-MPPT combiner arrangement and confirm all current and voltage limits.

Example – Commercial Inverter with Four MPPTs

A commercial solar inverter with four MPPT trackers may require separate protection for multiple PV string groups.

The correct PV Next configuration depends on the number of parallel strings per tracker and the required connection arrangement.

An appropriately selected combiner box can reduce installation complexity, but an unsuitable string combination can exceed input limits or connect incompatible PV groups.

For inverter specifications, compare commercial solar inverters and hybrid solar inverters through 3Buy Solar.

Weidmüller PV Protect – 1000V & 1500V DC Surge Protection Boxes

The Weidmüller PV Protect is a preassembled surge protection box for photovoltaic applications.

It is designed to provide a practical solution where DC surge protection is required between the solar array and the inverter.

PV Protect Product Features

Depending on the model, the manufacturer offers:

• 1,000V and 1,500V DC versions
• Type I+II surge protection
• Type II surge protection
• Preassembled protection components
• Photovoltaic connector connection options
• Cable-gland connection options
• IP67-rated enclosure protection
• Compact installation design
• Clearly identified electrical connection points

Weidmüller PV Protect vs PV Next

These products have different primary purposes.

When Should Installers Choose PV Protect?

PV Protect is relevant when the installation requires a compact preassembled SPD solution without the wider string aggregation functions of a larger combiner box.

Typical applications include:

• Residential rooftop PV
• Commercial string inverter installations
• Surge protection retrofits
• Additional PV DC protection points
• Outdoor installations requiring suitable enclosure protection

PV Protect does not replace overcurrent protection or a DC isolator unless the exact selected product incorporates and is approved for those additional functions.

Weidmüller PV Inline – Compact PV Surge Protection for Restricted Spaces

The Weidmüller PV Inline is a compact photovoltaic surge protection solution developed for installations where available space is limited.

The manufacturer describes the product as a compact PV protection box with combined Type I+II surge protection.

It is particularly relevant to rooftop PV installations and selected retrofit applications.

Why PV Inline Is Different

Conventional PV surge protection may require space for a separate enclosure or protection assembly.

PV Inline is designed to fit into compact installation environments, including suitable cable duct arrangements.

The manufacturer’s design focuses on simplifying placement while providing the required surge protection functionality.

Key Application Areas

• Residential rooftop PV installations
• Existing solar system upgrades
• Restricted cable routing spaces
• Compact technical installation areas
• Additional photovoltaic surge protection

The product received the The smarter E Award 2025 and German Innovation Award 2025 in recognition of its compact design and functionality.

Installer Selection Requirements

Before ordering PV Inline, verify:

• Maximum PV operating voltage
• Device-rated continuous DC voltage
• Surge protection type
• Maximum short-circuit conditions
• Earthing arrangement
• Installation position
• Connector or cable connection requirements
• Cable duct dimensions
• Manufacturer installation instructions

The suitability of a compact SPD should be assessed electrically and mechanically, not simply by enclosure size.

Weidmüller VARITECTOR – PV Surge Protection Type I+II & Type II

The Weidmüller VARITECTOR PU PV range provides dedicated photovoltaic surge protective devices.

These components help limit transient overvoltages and protect connected equipment within the specified electrical installation.

Photovoltaic arrays are often installed on exposed roofs, commercial buildings or ground-mounted structures, where the electrical design must account for lightning-related and switching-related surges.

VARITECTOR PV Product Range

The manufacturer provides:

• Type I+II photovoltaic SPDs
• Type II photovoltaic SPDs
• 600V DC configurations
• 1,000V DC configurations
• 1,500V DC configurations
• Replaceable SPD modules on supported models
• Compact monobloc designs
• Visual protection status indicators
• Remote status signalling on selected versions

Type I+II vs Type II – Installer Comparison

The final choice must follow the relevant lightning and surge risk assessment and the applicable electrical requirements.

VARITECTOR PU PV Monobloc

Weidmüller offers monobloc Type II photovoltaic SPDs for 600V, 1,000V and 1,500V systems.

Manufacturer-described characteristics include:

• Maximum discharge current up to 40kA on specified variants
• Compact 54mm design
• Integrated status indication
• PV-specific DC protection architecture

Important Technical Parameters

For procurement, compare the following:

Ucpv: Maximum continuous operating voltage of the PV SPD.

In: Nominal discharge current under the applicable test conditions.

Imax: Maximum discharge current rating associated with the relevant Type II test.

Iimp: Impulse discharge current associated with the relevant Type I test.

Up: Voltage protection level.

Iscpv: Permitted prospective photovoltaic short-circuit current.

1000V vs 1500V PV Surge Protection

An SPD must be selected for the actual photovoltaic system voltage.

The design voltage must include the maximum expected cold-weather open-circuit voltage, not only the PV array’s nominal operating voltage.

For example, a photovoltaic array with an operating voltage below 1,000V may still produce a higher open-circuit voltage under particular temperature conditions.

The specified SPD must therefore be suitable for the maximum design voltage and the circuit’s electrical configuration.

Surge Protection for Battery Energy Storage Systems

A hybrid solar installation may have several electrical circuits requiring separate protection assessment:

• Photovoltaic DC inputs
• Battery DC connections
• Grid-connected AC outputs
• Backup AC outputs
• Monitoring and communication lines

A PV-specific VARITECTOR SPD must not automatically be used on a solar battery DC connection.

Battery surge protection must be selected according to battery voltage, grounding arrangement, prospective fault conditions and the applicable equipment requirements.

For further equipment, visit Solar PV Protection & Disconnectors at 3Buy Solar.

Weidmüller PV-Stick – Crimp-Free Solar PV Connectors with SNAP IN Technology

The Weidmüller PV-Stick is a photovoltaic connector developed for field installation without conventional crimp contact assembly.

It uses Weidmüller’s SNAP IN connection technology.

The manufacturer describes the PV-Stick as suitable for specified photovoltaic applications up to 1,500V DC.

PV-Stick Technical Advantages

• SNAP IN connection technology
• No conventional crimping operation required
• No separate crimp contact insertion
• Audible confirmation of conductor insertion
• Compact field installation
• Available photovoltaic DC connection configurations
• TÜV-tested product versions
• IEC 62852 certification for specified variants
• Installation-oriented mechanical design

How Does PV-Stick Work?

The conductor is prepared according to the manufacturer’s specified stripping dimensions.

The stripped conductor is inserted into the connection mechanism, triggering the SNAP IN contact.

The connection produces an audible click indicating that the mechanism has engaged.

The connector is then completed according to the manufacturer’s installation procedure.

The key procurement advantage is that the connection process does not require the same crimping workflow used by conventional PV connectors.

This can reduce tool requirements and installation steps for properly trained technicians.

Does Crimp-Free Mean Tool-Free Installation?

PV-Stick eliminates the conventional crimping step.

However, cable preparation, insulation stripping, connector assembly and inspection remain necessary.

Professional installers must still use the correct conductor size, cable insulation dimensions and manufacturer-approved procedure.

PV-Stick for Commercial Solar PV

The connector is relevant to:

• Solar panel string extensions
• DC field wiring
• Rooftop photovoltaic projects
• Commercial PV installations
• Correctly specified combiner box connections
• Repeat installer procurement
• PV maintenance and replacement work

For technical specifications, visit the manufacturer’s PV Connector Product & Installation Documentation.

Weidmüller WM4 C – 1500V Photovoltaic Connectors with Crimp Technology

The Weidmüller WM4 C is a photovoltaic DC connector system using conventional crimp connection technology.

The manufacturer offers field connectors and compatible equipment connection variants.

WM4 C Technical Features

Manufacturer-described characteristics include:

• DC voltage ratings up to 1,500V on specified models
• IEC 62852-approved product versions
• TÜV-certified connector configurations
• Compatible 4mm² and 6mm² cable connection options
• Rated current up to 35A on specified versions
• Crimp contact assembly
• Matching tools and installation accessories
• Compatible interfaces on selected PV Next combiner boxes

Weidmüller PV-Stick vs WM4 C

Critical Connector Compatibility Warning

Photovoltaic connectors should only be mated in combinations approved by the relevant manufacturers and supported by the applicable certification.

A connector being described as MC4-type or MC4-compatible does not establish universal mating compatibility.

In particular, Weidmüller WM4 C and PV-Stick connector variants must not automatically be treated as interchangeable with original Stäubli MC4, MC4-Evo 2 or other manufacturers’ connectors.

Where a combiner box is specified with a WM4 C interface, the installer must verify the mating connector and cable termination arrangement.

Procurement Checklist for PV Connectors

• Exact manufacturer and connector model
• Male/female connector configuration
• Rated DC voltage
• Rated current
• Cable conductor cross-section
• Cable outer insulation diameter
• Permitted mating connector
• Crimping or SNAP IN procedure
• Required installation tools
• Environmental protection
• Relevant product certificate
• Order quantity

Browse PV Connectors & MC4 Connector Accessories at 3Buy Solar.

Weidmüller PV Next Fireman Switch – Solar PV Emergency Disconnection

The Weidmüller PV Next Fireman Switch is developed for photovoltaic installations requiring automatic string-side disconnection during specified emergency conditions.

The system can disconnect PV circuits according to its approved switching and control architecture.

This is particularly relevant to rooftop photovoltaic installations where long DC cable routes may otherwise remain energised between the modules and the solar inverter.

PV Next Fireman Switch Features

Depending on model, the manufacturer provides:

• Automatic DC string disconnection
• Remote disconnection arrangements
• Compact enclosure design
• Multiple string and MPPT configurations
• Optional integrated surge protection
• Automatic reconnection under approved operating conditions
• Rooftop installation options
• Defined emergency switching functionality

Fireman Switch vs DC Isolator

A standard DC isolator provides manual circuit isolation when operated appropriately.

A fireman switch adds an emergency disconnection function according to its control architecture.

However, string-level disconnection does not automatically make the photovoltaic modules themselves voltage-free.

PV modules continue producing voltage when exposed to light.

The location of the switching equipment and the parts of the circuit remaining energised must be understood before declaring an installation safe.

Does a Fireman Switch Replace Module-Level Rapid Shutdown?

Not necessarily.

Module-level rapid shutdown and string-level emergency disconnection are different technical arrangements.

The appropriate solution depends on the project requirements and the applicable national electrical and fire safety rules.

Professional installers should verify the required shutdown voltage limits, disconnection time, control arrangement and device location.

Browse Rapid Shutdown & Firefighter Safety Equipment at 3Buy Solar.

Weidmüller Utility-Scale PV DC Combiner Boxes – 1500V Solar Applications

For larger photovoltaic power plants, Weidmüller develops dedicated utility-scale DC combiner boxes.

These products are designed for ground-mounted PV installations, central inverter architecture and high-power photovoltaic arrays.

Unlike standard residential rooftop boxes, utility-scale equipment may be specified for higher DC voltage, greater string quantities and additional monitoring requirements.

Weidmüller 1500V PV Combiner Box Technology

Manufacturer-described options include:

• 1,500V DC system voltage
• Multiple photovoltaic string inputs
• gPV string fuse protection
• DC surge protection
• DC switching functions
• Monitoring-ready enclosures
• Customised input/output arrangements
• High-current terminals and busbars
• Industrial outdoor installation
• Project-specific configuration

High-Current Combiner Boxes for Modern Solar Panels

Modern commercial and utility-scale photovoltaic modules may have higher operating and short-circuit currents than earlier generations.

Weidmüller’s high-current PV combiner box range addresses installations using high-power and bifacial modules.

Manufacturer-described equipment options include:

• Six- and eight-input configurations
• 1,500V DC architecture
• gPV fuse protection
• 35–75A fuse product options
• Type I+II or Type II surge protection
• High-current string connections
• Industrial monitoring integration

Example Utility-Scale Weidmüller Models

These are examples from the manufacturer’s high-current PV combiner box portfolio.

The published maximum short-circuit current per input must not be confused with the nominal fuse rating or the maximum continuous output current of the complete box.

For EPC procurement, verify the current datasheet and the specific internal protection configuration.

Weidmüller PV AC Combiner Boxes – Commercial Inverter Output Aggregation

Weidmüller also manufactures PV AC combiner boxes for larger commercial and utility-scale installations.

Unlike a photovoltaic DC combiner box, an AC combiner box operates on the output side of the solar inverters.

The manufacturer’s portfolio includes solutions for multiple string inverters with rated AC voltages of 400V, 690V and 800V.

Weidmüller PV AC Combiner Box Specifications

Manufacturer-described applications include:

• Solar string inverters from 60kW to 200kW
• Aggregation of two to six inverter outputs
• 400V AC configurations
• 690V AC configurations
• 800V AC configurations
• AC short-circuit protection
• Surge protection
• Inverter isolation for maintenance
• Industrial enclosure construction
• IEC 61439-2-tested assemblies

AC Combiner Box vs DC Combiner Box

AC and DC combiner boxes cannot be substituted for each other.

For commercial PV projects, both may be needed depending on system architecture and electrical distribution design.

Weidmüller PV String Monitoring – Solar SMS for Utility-Scale Plants

The Weidmüller Solar SMS platform is designed for photovoltaic string monitoring in larger power plants.

String monitoring is particularly relevant to installations where operators must identify performance differences or faults among many photovoltaic circuits.

What Does Solar SMS Monitor?

Depending on model and system design, Weidmüller’s monitoring architecture supports:

• Individual PV string current measurement
• String voltage monitoring
• Surge protective device status
• Circuit breaker or switching status
• Operating data collection
• Fault identification
• Communication with plant monitoring systems

Solar SMS Technical Architecture

The manufacturer provides modular solutions including:

• Solar SMS Master
• Solar SMS Slave
• RS485 communication
• Modbus RTU integration
• Fibre-optic options
• LoRaWAN communication variants

The system supports monitoring of up to 32 strings in documented configurations.

Selected monitoring modules support current measurement ranges up to 50A per string.

Why String Monitoring Matters for EPC & O&M Teams

In a large photovoltaic installation, a single underperforming string may contribute only a small percentage of total plant output.

Without sufficiently detailed monitoring, such faults can remain unnoticed.

String monitoring can help identify abnormal performance and support maintenance planning.

For commercial and utility-scale projects, this contributes to more effective operations and maintenance.

The actual benefit depends on system design, monitoring granularity, fault response and overall plant performance.

Solar SMS vs Solar Inverter Monitoring

Manufacturer inverter portals typically provide operating information from the inverter itself.

String monitoring equipment provides additional information at the PV string or combiner box level.

These functions complement one another but are not identical.

For related equipment, visit Solar Inverter Monitoring & Data Loggers at 3Buy Solar.

Weidmüller PV Communication Boxes & Weather Monitoring

Commercial and utility-scale solar plants often require a wider monitoring infrastructure than individual inverter data connections.

Weidmüller develops PV communication boxes and weather monitoring equipment for larger installations.

PV Communication Boxes

These are used to connect, organise and transmit operating data from supported field equipment.

Depending on project design, the communication architecture may involve:

• Inverter communications
• PV string monitoring
• Industrial networking
• Data conversion
• Monitoring gateways
• Plant supervisory systems

PV Weather Boxes

Weather measurements can provide useful context when analysing photovoltaic performance.

Parameters may include:

• Solar irradiance
• Module temperature
• Ambient temperature
• Wind speed
• Wind direction
• Humidity
• Precipitation

Combining environmental measurements with actual PV generation data can support performance analysis and fault investigation.

Integration with Plant SCADA

For utility-scale projects, the communications and monitoring infrastructure must be coordinated with the selected SCADA and plant control architecture.

Protocol compatibility, data availability and system access requirements should be confirmed during engineering.

These products are part of Weidmüller’s wider manufacturer portfolio and are subject to project-specific sourcing.

Weidmüller Klippon Connect & Industrial Electrical Connectivity

Beyond photovoltaic-specific products, Weidmüller manufactures industrial terminal blocks, device connections and electrical panel components.

Its Klippon Connect terminal block portfolio includes products relevant to electrical distribution, control cabinets and industrial automation.

Klippon Connect Technologies

The manufacturer offers:

• SNAP IN terminal blocks
• PUSH IN terminal blocks
• Screw connection terminal blocks
• Feed-through terminal blocks
• PE terminal blocks
• Fuse terminal blocks
• Disconnect terminal blocks
• Power distribution connections
• Marking and identification accessories

These are relevant to appropriately designed AC distribution boards, control cabinets, monitoring equipment and industrial electrical installations.

OMNIMATE Device Connectivity

The manufacturer’s OMNIMATE product portfolio covers connectors and terminals for electronic equipment.

Applications include power electronics, inverter control equipment and industrial communication devices.

Why Weidmüller Connectivity Matters

Professional electrical installations require connections with appropriate current ratings, insulation characteristics, environmental suitability and mechanical retention.

Incorrect terminal selection can compromise an otherwise properly designed system.

For procurement, terminal blocks and connectors must be specified according to the intended circuit and manufacturer product ratings.

Weidmüller Components for Solar Batteries, Hybrid Inverters & Complete Kits

Weidmüller should be distinguished from solar inverter and battery manufacturers.

Its photovoltaic product portfolio is primarily focused on electrical connectivity, protection, switching, distribution and monitoring, rather than manufacturing residential solar batteries or conventional hybrid solar inverters.

However, these components are relevant to installations combining photovoltaic generation with energy storage.

PV Side of a Hybrid Energy Storage System

A hybrid solar inverter receives power from a photovoltaic array.

Depending on system design, this DC input arrangement may require external surge protection, string connections, appropriate isolation and monitoring.

Weidmüller products can be specified for these functions where the exact electrical ratings and approvals are suitable.

Battery Side of an Energy Storage System

A solar battery connection has different electrical characteristics from the photovoltaic strings.

Battery protection must account for:

• Battery operating voltage
• Maximum charge/discharge current
• Prospective short-circuit current
• BMS and contactor architecture
• Permitted switching equipment
• DC fuse and breaker requirements
• Cable and busbar ratings
• Manufacturer-approved protective arrangements

A Weidmüller PV Next combiner box or PV-specific SPD must not automatically be used as battery protection equipment.

Complete Solar PV Kit Electrical BOS

A professional complete solar kit may require:

• Solar panels
• Grid-tied or hybrid inverter
• Compatible solar battery
• PV cables
• Approved PV connectors
• DC surge protection
• DC disconnect equipment
• AC circuit protection
• Monitoring accessories
• Mounting system
• Appropriate earthing and bonding
• Distribution equipment

Weidmüller’s electrical infrastructure portfolio is relevant to several of these functions.

Browse related equipment:

• Solar Panels
• Hybrid Solar Inverters
• Solar Batteries
• Energy Storage Kits with Inverter
• Commercial Energy Storage
• Complete Solar PV Kits

These are multibrand 3Buy Solar product categories. Listed equipment should only be combined where the appropriate technical compatibility has been established.

Weidmüller Electrical BOS Selection – Installer & EPC Technical Checklist

Before ordering Weidmüller PV components, the following technical parameters should be confirmed.

1. Solar PV Array

• PV module manufacturer and model
• Module rated power
• Open-circuit voltage
• Short-circuit current
• Modules per string
• Number of parallel strings
• Minimum design temperature
• Maximum system DC voltage

2. Solar Inverter

• Exact manufacturer model
• Number of MPPT trackers
• Number of string inputs
• Maximum input voltage
• Maximum operating current per MPPT
• Maximum short-circuit current per input
• Existing DC isolation functionality
• Integrated SPD specification, where applicable

3. Combiner Box

• Number of MPPT groups
• Number of string inputs
• Number of outputs
• Required string aggregation
• Rated DC voltage
• Rated current
• Required PV fuse protection
• Required SPD class
• Switch-disconnector requirement
• Enclosure protection
• Connector interface

4. Surge Protection

• Type I+II or Type II
• Ucpv voltage rating
• Nominal and maximum discharge capability
• Impulse discharge capability where required
• Voltage protection level
• Short-circuit characteristics
• Earthing and lightning protection design
• Protection coordination requirements

5. PV Connectors

• Exact connector manufacturer
• Male/female connector type
• Mating approval
• Cable conductor cross-section
• Cable insulation diameter
• Voltage and current ratings
• Approved installation tools
• Manufacturer certification

6. Electrical Documentation

• Manufacturer datasheet
• Installation manual
• EU Declaration of Conformity where applicable
• Required IEC/EN certificates
• Product-specific approvals
• Technical drawings
• Tender specifications
• Installation and maintenance instructions

This checklist can be used when preparing project quotations, supplier RFQs, equipment tenders and electrical bills of materials.

Weidmüller CE Documentation, European Standards & Technical Downloads

Professional photovoltaic projects require documentation appropriate to the actual equipment and installation country.

Weidmüller provides product-specific technical specifications, drawings, datasheets, approvals and installation documentation through its official resources.

Official Weidmüller Technical Resources

Weidmüller – Official Manufacturer Website

Industrial connectivity, photovoltaic components, automation and electrical engineering technology.

Weidmüller – Official Photovoltaics Portfolio

Residential and commercial PV connection, protection and monitoring equipment.

Weidmüller – PV Next Combiner Box Technical Documentation

Product configurations, installation manuals, selection guidance and related technical files.

Weidmüller – PV Connector Technical Documentation

PV-Stick, WM4 C, installation procedures and available certificates.

Weidmüller – Technical Product Catalogues

Manufacturer product catalogues, including the 2026 renewable energy technology portfolio.

Weidmüller – Official Online Product Catalogue

Exact manufacturer order numbers, product specifications, approvals, datasheets and engineering documentation.

Relevant European Electrical Standards

Depending on the product and installation, relevant standards include:

The exact edition, national adoption and project applicability must be verified for the destination country.

CE Marking vs Independent Product Certification

CE marking is not the same as an independent TÜV or VDE certificate.

For professional procurement, distinguish between:

• EU Declaration of Conformity
• Independent product test certificate
• Manufacturer installation manual
• Relevant IEC/EN compliance documentation
• Technical datasheet
• Assembly approval
• Country-specific requirements

Do not assume that an approval covering one Weidmüller PV Next, connector or SPD model applies to the entire product family.

Weidmüller Installation Videos – 3Buy Solar Training & Technical Support

Professional photovoltaic installation requires technical knowledge covering DC wiring, protection, inverter configuration, electrical distribution and system commissioning.

The 3Buy Solar YouTube Training & Technical Support Channel provides installation tutorials, product demonstrations and technical resources relevant to professional solar PV and battery energy storage installations.

3Buy Solar Installer Training Resources

Our training resources cover topics including:

• Solar inverter installation
• Solar PV system wiring
• Hybrid energy storage integration
• Electrical protection and metering
• Inverter commissioning
• Battery energy storage
• System monitoring
• PV fault diagnosis
• Professional installation practices

Official Weidmüller PV Installation Videos

For Weidmüller-specific product training, consult the manufacturer’s technical pages.

Weidmüller PV Next – Combiner Box Installation & Product Videos

Manufacturer videos demonstrating the PV Next design and connection concept.

Weidmüller PV-Stick – SNAP IN Connector Installation

Manufacturer resources demonstrating the crimp-free PV-Stick assembly process.

Weidmüller VARITECTOR – Surge Protection Technical Talks

Manufacturer educational resources explaining surge protection principles, device selection and operating requirements.

3Buy Solar Installer Academy

Professional installers and technical procurement teams can also visit the 3Buy Solar Installer Training & Webinar Academy.

Our technical training resources supplement the latest manufacturer documentation.

For safety-critical PV equipment, the applicable Weidmüller installation manual and electrical standards must always take precedence.

Why Professional Solar Installers Choose Weidmüller

Weidmüller is particularly relevant to photovoltaic projects where electrical safety, installation consistency and maintainability are important.

PV-Specific Product Engineering

Products such as PV Next, PV Protect and VARITECTOR PU PV are developed for photovoltaic electrical applications.

Installer-Oriented Connection Technology

PV-Stick, WM4 C, PUSH IN and SNAP IN technology provide different options for improving field wiring and electrical connections.

Broad Combiner Box Portfolio

Weidmüller provides configurations for residential rooftops, commercial installations and utility-scale solar plants.

Surge & Lightning Protection

Its PV protection portfolio includes equipment for different DC voltage classes and surge protection requirements.

Emergency Disconnection

PV Next Fireman Switches provide defined automatic disconnection functions for selected rooftop PV systems.

Commercial & Utility Monitoring

Solar SMS, PV communication boxes and weather monitoring equipment support larger photovoltaic plant operation.

Industrial Electrical Expertise

The manufacturer’s terminal block, connection and automation portfolio supports a wider range of electrical installations.

Manufacturer Documentation

Exact order numbers, technical specifications, product drawings and downloadable documentation simplify procurement and project engineering.

For professional installers, the primary objective is not simply to buy branded electrical accessories. It is to select correctly rated, documented components for the installation.

Why Source Weidmüller PV Components Through 3Buy Solar?

3Buy Solar is a European B2B solar PV supplier, solar wholesaler and solar distributor serving qualified electrical contractors, professional solar installers, EPC companies, resellers and technical procurement teams.

Our procurement activities cover solar panels, solar inverters, solar batteries, energy storage equipment and the related components required for complete PV projects.

Model-Specific Weidmüller Sourcing Enquiries

Professional buyers can submit Weidmüller order numbers for confirmation of availability, purchasing terms and delivery options.

This is particularly important for combiner boxes and protection equipment, where visually similar products can have very different electrical specifications.

Project-Based Electrical BOS Procurement

For larger installations, procurement enquiries may include several product families, such as:

• PV Next combiner boxes
• VARITECTOR SPDs
• PV-Stick connectors
• WM4 C connectors
• PV Next Fireman Switches
• PV monitoring accessories
• Solar cables
• Related electrical equipment

Complete Solar Project Supply

3Buy Solar also offers related equipment through its multibrand catalogue, enabling buyers to plan photovoltaic panels, hybrid inverters, batteries and installation components together.

European Logistics

Delivery and logistics arrangements depend on confirmed product availability, equipment characteristics, order quantities and destination.

Bulk Purchasing & Installer Orders

Buyers requiring repeated quantities can submit the complete manufacturer part list for commercial evaluation.

Manufacturer Documentation & Technical Resources

We link directly to official Weidmüller specifications and technical resources to support accurate product identification.

3Buy Solar Installer Education

Our YouTube channel and training academy provide further resources relevant to solar PV and energy storage installation.

For project-specific service, commissioning and warranty enquiries, the current manufacturer instructions and authorised support process should be followed.

Weidmüller B2B Procurement – What to Include in Your RFQ

For an accurate Weidmüller quotation, professional buyers should submit the following details.

Manufacturer Order Number: Exact Weidmüller article number.

Product Description: PV Next, PV Protect, VARITECTOR, PV-Stick, WM4 C, Fireman Switch or another component.

Quantity: Required units and any anticipated repeat-order volumes.

PV System Voltage: Maximum DC voltage, including temperature-adjusted string Voc.

Current: Maximum operating and short-circuit current.

Inverter: Manufacturer, model and relevant PV input specifications.

MPPT Configuration: Number of trackers and strings per tracker.

Protection Requirements: SPD type, required fuse protection and disconnection functions.

Connection Type: WM4 C, approved alternative PV connector or cable-gland connection.

Enclosure Requirements: Indoor/outdoor location, protection rating and environmental conditions.

Compliance: Applicable IEC/EN documentation and project-specific approvals.

Delivery: Destination country, delivery address and requested project schedule.

For larger commercial installations, include the electrical single-line diagram, equipment schedule or bill of materials.

This improves the accuracy of technical identification and reduces the risk of ordering an unsuitable protection device.

Request a Weidmüller B2B Quotation – Contact 3Buy Solar

Frequently Asked Questions About Weidmüller Solar Components

What does Weidmüller manufacture for solar PV systems?

Weidmüller manufactures photovoltaic combiner boxes, surge protection equipment, DC connectors, fireman switches, industrial connectivity components and solar monitoring systems. Its portfolio includes PV Next, PV Protect, PV Inline, VARITECTOR, PV-Stick, WM4 C and Solar SMS.

Is Weidmüller a German manufacturer?

Yes. Weidmüller is a German industrial electrical engineering and connectivity manufacturer headquartered in Detmold, Germany.

What is Weidmüller PV Next?

PV Next is a modular photovoltaic combiner box platform designed for rooftop and commercial solar installations. Different models provide string aggregation, surge protection, optional fuse protection and additional switching functionality.

What is the difference between PV Next and PV Protect?

PV Next is a combiner box platform with different string connection and protection configurations. PV Protect is primarily a compact preassembled DC surge protection solution. The correct product depends on whether the project requires string aggregation, surge protection or additional switching functions.

Does Weidmüller offer 1500V solar PV protection?

Yes. Weidmüller manufactures selected 1,500V DC protection products, including PV Protect, VARITECTOR and utility-scale combiner box equipment. Standard PV Next rooftop products frequently have a different voltage rating, such as 1,100V. The exact model must be checked.

What is Weidmüller VARITECTOR?

VARITECTOR is Weidmüller’s surge protection equipment range. The PU PV series includes photovoltaic-specific devices with Type I+II and Type II protection configurations for different DC system voltages.

What is the difference between Type I+II and Type II SPD?

Type I+II provides combined lightning-current and transient overvoltage protection functions. Type II provides surge protection for applications where Type II capability is sufficient. The appropriate device must be selected according to the installation’s lightning and surge protection assessment.

What is Weidmüller PV Inline?

PV Inline is a compact photovoltaic surge protection product intended for limited installation spaces, including suitable rooftop cable duct applications. The manufacturer offers a combined Type I+II surge protection design.

What is Weidmüller PV-Stick?

PV-Stick is a photovoltaic DC connector using SNAP IN technology to provide conductor termination without conventional crimping. Manufacturer-approved versions are available for photovoltaic applications up to 1,500V DC.

What is the difference between Weidmüller PV-Stick and WM4 C?

PV-Stick uses SNAP IN connection technology, while WM4 C uses crimp-type electrical contacts. Both are photovoltaic connector platforms, but they have different installation methods and product requirements.

Are Weidmüller WM4 C connectors compatible with original MC4 connectors?

They must not automatically be assumed compatible. Physical mating does not establish manufacturer-approved cross-compatibility. The exact connector pair and applicable certification must be confirmed before installation.

Can Weidmüller PV Next be used with Deye, Solis, SolaX or Huawei inverters?

Potentially, where the selected PV Next model matches the inverter’s DC input configuration and the photovoltaic array’s electrical parameters. Compatibility depends on voltage, current, MPPT arrangement, strings per MPPT, connectors and protection requirements—not the inverter brand alone.

Does Weidmüller manufacture firefighter switches?

Yes. The PV Next Fireman Switch range provides automatic photovoltaic DC string disconnection functions for specified emergency operating conditions.

Does a PV Next Fireman Switch make the solar panels voltage-free?

No. Disconnection interrupts the specified DC electrical circuit, but photovoltaic modules can continue generating voltage when illuminated. The remaining energised portions depend on the installation design.

Does Weidmüller manufacture utility-scale combiner boxes?

Yes. Weidmüller supplies PV DC combiner boxes for larger solar plants, including 1,500V-class equipment and higher-current variants for modern PV modules.

Does Weidmüller manufacture AC combiner boxes?

Yes. Its commercial and utility-scale AC combiner box portfolio supports suitable string inverter output aggregation, with configurations for 400V, 690V and 800V AC systems.

What is Weidmüller Solar SMS?

Solar SMS is the manufacturer’s photovoltaic string monitoring platform. It supports monitoring of electrical string parameters and additional equipment status information in appropriately configured commercial and utility-scale PV plants.

Does Weidmüller manufacture solar inverters and solar batteries?

Weidmüller is primarily known for electrical connectivity, protection and monitoring equipment rather than conventional residential solar inverters or solar batteries. Its components can be used within correctly engineered solar-plus-storage installations.

Can Weidmüller PV SPDs protect a lithium battery system?

A PV-specific SPD is not automatically suitable for battery DC protection. The device must be approved for the actual battery voltage, electrical configuration and fault conditions. Battery protection should follow the relevant energy storage system manufacturer’s instructions.

Where can I download Weidmüller datasheets and certificates?

Official technical files, datasheets and product approvals are available through the Weidmüller Online Product Catalogue and Technical Product Catalogue Library.

Where can professional buyers source Weidmüller solar components in Europe?

Professional installers, electricians, EPC contractors and B2B procurement teams can contact 3Buy Solar with the exact Weidmüller manufacturer order numbers for a sourcing enquiry. Availability, price and delivery conditions must be confirmed before ordering.

Source Weidmüller PV Next, VARITECTOR & Solar Electrical Components Through 3Buy Solar

Weidmüller provides electrical connectivity, protection and monitoring technologies for residential, commercial and utility-scale photovoltaic installations.

From PV Next combiner boxes and VARITECTOR surge protection to PV-Stick connectors, PV Next Fireman Switches and industrial monitoring systems, its portfolio supports the electrical infrastructure required for professional solar PV projects.

At 3Buy Solar, we help European installers, EPC contractors, electrical specialists and procurement teams identify and source suitable solar PV equipment and related electrical components.

For Weidmüller products, submit your manufacturer model numbers, order quantities, required technical documentation and delivery details.

Request a Weidmüller B2B Quotation – Contact 3Buy Solar

3Buy Solar – European B2B Solar PV Supply, Combiner Boxes, Surge Protection & Professional Electrical Components.