DC Fuse

DC Fuse for Solar PV and DC Power Systems

A DC fuse protects solar PV strings, battery circuits and DC combiner boxes from overcurrent, reverse current and short-circuit faults. Unlike AC circuits, DC circuits do not naturally cross zero current, so PV and battery applications require fuses designed and rated for direct current interruption.

ETEK supplies DC fuse links, PV fuse holders and solar fuse protection devices for photovoltaic systems, combiner boxes, inverter inputs and other DC distribution applications. Common selections include gPV solar fuses for 1000V DC and 1500V DC systems, with current ratings chosen according to PV string current and system protection design.

How to choose a DC fuse

• Match the fuse voltage rating to the maximum DC system voltage, such as 1000V DC or 1500V DC.
• Select the current rating according to PV string current, parallel string count and equipment requirements.
• Use gPV-rated fuses for solar photovoltaic string protection.
• Pair the fuse link with a compatible DC fuse holder or fuse base.
• Check applicable IEC standards, temperature rating and installation environment.

DC Fuse FAQ

What is a DC fuse used for?

A DC fuse is used to disconnect a DC circuit when current exceeds a safe level, protecting cables, PV strings, batteries and equipment from overcurrent and short-circuit faults.

Can I use an AC fuse in a DC circuit?

No. DC arcs are harder to interrupt than AC arcs, so a fuse used in a DC circuit must have a suitable DC voltage and breaking capacity rating.

What fuse is used for solar PV systems?

Solar PV systems commonly use gPV DC fuses rated for photovoltaic string protection, often at 1000V DC or 1500V DC depending on the system voltage.

Where is a solar DC fuse installed?

A solar DC fuse is commonly installed in a PV string fuse holder, combiner box or inverter-side DC protection circuit according to the system design.

How do I size a DC fuse for solar?

Fuse sizing depends on PV string current, module short-circuit current, number of parallel strings, cable rating and local electrical rules. Always follow the equipment manual and applicable standards.

Can ETEK supply OEM DC fuses and fuse holders?

Yes. ETEK supplies DC fuse links and compatible fuse holders for solar PV and DC power applications, with wholesale and OEM options for distributors and equipment manufacturers.