Mersen Z1033389 HP12NH3LGPV250 HelioProtection gPV photovoltaic fuse link rated at 250 A and 1250 V DC with NH3L construction and plain blade terminals.
Replacement product
MERSEN FUSE 1500VDC NH3L gPV 250A HP15NH3LGPV250
SKU: K1037861
£277.71 ex VAT
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£201.18
The Mersen Z1033389, catalogue number HP12NH3LGPV250, is a heavy-duty gPV photovoltaic fuse link developed to provide reliable overcurrent and short-circuit protection for high-voltage solar power installations. As part of the Mersen HelioProtection® HP12NH series, it is specifically engineered for modern photovoltaic systems operating at up to 1250 V DC, helping protect cables, combiner equipment and inverter DC inputs from damaging electrical faults.
Rated at 250 A, the Z1033389 features a robust NH3L square-body fuse with plain blade terminals for installation into compatible fuse clips. Its full-range gPV operating characteristic enables reliable interruption of both low-level overload currents and high-energy short-circuit faults commonly encountered within photovoltaic arrays.
Designed to meet recognised international photovoltaic protection standards, this fuse combines low power dissipation, durable construction and excellent resistance to thermal cycling, making it ideal for utility-scale, commercial and industrial renewable energy installations.
Dedicated photovoltaic fuse links are specifically engineered to safely interrupt the unique DC fault currents generated by solar arrays. The Mersen Z1033389 helps protect grouped photovoltaic strings, combiner equipment and inverter inputs from damaging overloads while maintaining dependable long-term performance in demanding renewable energy environments.
Its robust NH3L construction and proven gPV operating characteristics make it well suited to commercial rooftop installations, industrial photovoltaic systems and utility-scale solar farms where system uptime and equipment protection are essential.
| Current | 250 A |
|---|---|
| Voltage | 250 V |
| Manufacturer | Mersen |
| Series | HelioProtection® HP12NH |
| Item number | Z1033389 |
| Catalogue number | HP12NH3LGPV250 |
| Product type | Photovoltaic fuse link |
| Fuse utilisation category | gPV |
| Rated current | 250 A |
| Rated voltage | 1250 V DC |
| Breaking capacity | 50 kA DC |
| Fuse size | NH3L |
| Terminal type | Plain blades |
| Mounting method | Fuse clip mounting |
| Power dissipation at rated current | 46 W |
| Power dissipation at 0.7 × rated current | 18 W |
| Frequency | 50 / 60 Hz |
| Standards | IEC 60269-6, UL 2579 |
| RoHS compliant | Yes |
The Mersen Z1033389 protects photovoltaic cables, grouped strings, combiner boxes and inverter DC inputs against overloads and short circuits.
The fuse has a rated current of 250 A.
The Z1033389 is designed for photovoltaic systems operating at up to 1250 V DC.
The gPV classification identifies a full-range photovoltaic fuse capable of protecting solar DC circuits against both overload and short-circuit faults.
This NH3L fuse link has plain blade terminals and is installed into a compatible photovoltaic fuse base or fuse clip assembly.
Mersen HelioProtection® photovoltaic fuse links are trusted worldwide by renewable energy engineers, EPC contractors and solar installers to deliver dependable DC protection for modern photovoltaic systems.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
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...
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...