Mersen B1003997 DC121GC12C125EF HelioProtection size 121 gPV photovoltaic fuse-link rated at 125 A and 1200 V DC for solar array cable, grouped-string and combiner-box protection.
£213.09
The Mersen B1003997, catalogue reference DC121GC12C125EF, is a high-performance photovoltaic fuse-link designed to protect solar array cables, grouped photovoltaic strings and DC distribution circuits against overloads and short-circuit faults. Part of the Mersen HelioProtection® DC120-123 series, it delivers reliable full-range protection for modern photovoltaic installations operating at high DC voltages.
Featuring a specialised gPV operating characteristic, this fuse is engineered specifically for photovoltaic applications where low fault currents require dedicated protection. It helps safeguard valuable solar equipment while maintaining high system reliability and minimising downtime.
With a rated current of 125 A, a rated voltage of 1200 V DC and a 100 kA breaking capacity, the B1003997 is ideal for protecting combiner boxes, grouped PV strings and inverter DC inputs. Its Size 121 square-body construction allows secure installation in compatible photovoltaic fuse bases.
Photovoltaic systems require specialised protective devices capable of safely interrupting the low yet sustained fault currents produced by solar arrays. The Mersen B1003997 provides full-range gPV protection to help protect conductors, combiner boxes and inverter input circuits from electrical damage.
Its high breaking capacity and robust square-body construction make it suitable for commercial rooftop installations, industrial solar systems and utility-scale photovoltaic power plants operating at up to 1200 V DC.
| Current | 125 A |
|---|---|
| Voltage | 200 V |
| Manufacturer | Mersen |
| Series | HelioProtection® DC120-123 |
| Model | B1003997 |
| Catalogue reference | DC121GC12C125EF |
| Product type | Photovoltaic DC fuse-link |
| Rated current | 125 A |
| Rated voltage | 1200 V DC |
| Operating characteristic | gPV |
| Current type | DC |
| Breaking capacity | 100 kA |
| Fuse size | Size 121 |
| Body format | Square body |
| Indicator | None |
| Power loss at rated current | 41 W |
| Applicable standards | IEC 60269-1 and IEC 60269-6 |
| EAN | 3605340478617 |
The Mersen B1003997 protects photovoltaic cables, grouped solar strings and DC distribution circuits against overloads and short-circuit faults.
The B1003997 has a rated current of 125 A.
This photovoltaic fuse is rated for operation at up to 1200 V DC.
A gPV fuse provides full-range protection specifically for photovoltaic systems, covering both overloads and short-circuit faults.
No. This version is supplied without a visual indicator and is intended for installation in compatible photovoltaic fuse bases.
Mersen HelioProtection® fuse-links are trusted by solar installers, EPC contractors and renewable energy engineers worldwide to provide dependable protection for high-voltage photovoltaic installations.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...