Define the DC system
Record maximum voltage, operating current, source characteristics, polarity and installation architecture.
Solar DC Protection Systems
Solar DC Protection Systems
PV and other DC systems require devices documented for the relevant DC voltage, connection and fault duty; an AC rating cannot simply be carried across.
01 What problem does this project solve?
Photovoltaic DC Protection
On the DC side of a PV array the fault behaviour is different from anything on the AC side. There is no natural current zero to help interrupt an arc, both conductors are live, and the array sits outdoors on a roof where it is exposed to both weather and lightning. Protection has to be selected for those conditions specifically.
- No natural current zero to assist DC arc interruption
- Both polarities live — neither can be treated as a neutral
- String fault current limited by the array itself
- Lightning and surge exposure on an outdoor structure
- Safe isolation for inverter and array maintenance
- UV, water and temperature exposure on all enclosures
02 What does one system need?
The devices a complete system requires.
03 How does LAIWO solve it?
One product set, mapped to each protection function.
We build the DC side as one coordinated set rather than as separate components: gPV fuse links and matching holders, DC-rated isolation, Type 1+2 surge protection and the IP65 enclosure that houses them. Voltage class is the first decision — the 1000V and 1500V product sets are not interchangeable.
| Project requirement | LAIWO solution |
|---|---|
| String overcurrent | WPV-FU gPV fuse link, 10×38 or 10×85 |
| Fuse mounting and indication | WPV32 holder, indicator version |
| Isolation | WRI enclosed or RIS DIN-rail isolator |
| Surge | WSPV Type 1+2 DC SPD |
| Combining and enclosure | WENC IP65 combiner box |
| Array connection | 1000VDC PV connectors |
04 Why should buyers choose LAIWO?
A manufacturer that covers the whole chain.
OEM / ODMIn-house factoryEngineering supportTestingCertificationCustom configuration
Application overview
Start with the system requirement, then select the product.
DC arcs and fault interruption differ from AC operation, making voltage, polarity, pole arrangement and connection method critical selection inputs. The exact device must be documented for the proposed DC application.
LAIWO’s solar and DC path covers DC breakers, PV fuses and holders, isolation, surge protection and solar distribution enclosures. Product selection should be supported by the current datasheet, wiring information and model-level approval scope.
Selection path
How a requirement becomes a controlled product package.
Each stage reduces ambiguity before samples, technical review and quotation.
Assign each protection function
Separate overcurrent protection, isolation and surge-protection requirements before selecting devices.
Check documented DC ratings
Verify voltage, breaking capability, pole arrangement and wiring against the exact model datasheet.
Coordinate the product package
Match devices, holders, enclosures, labels and technical files to the target application and market.
Product paths
Related product families
Frequently asked questions
Questions to resolve before quotation.
Can an AC MCB be used in a DC circuit?
Only where the exact model is specifically rated and documented for the proposed DC voltage and connection. Matching current ratings alone is not sufficient.
What data is needed for a PV fuse quote?
Provide fuse size, maximum voltage, operating and fault current, utilization category, quantity, holder requirement, destination market and documentation needs.
Can DC protection products be supplied as a coordinated range?
A range can combine breakers, fuses, holders, isolation, surge protection and enclosures, subject to application and compatibility review.
Technical & sales support
Next: evaluate the products themselves.
Choose the resource or sales route required for the next stage of product evaluation.
01 · Explore
View Catalogues
Review the existing product range before choosing a model or configuration.
Open downloads → 02 · VerifyGet Certificate Pack
Tell us the model and market so sales can match the relevant document scope.
Request documents → 03 · EvaluateRequest Samples
Share the product, rating, quantity and evaluation target for a sample discussion.
Discuss samples → 04 · SourceRequest a Quote
Send model, quantity, destination and OEM scope for a structured response.
Start an inquiry →