Solar 1500V DC 10x85mm Fuse complying with IEC 60269-1 & IEC 60269-6

Solar DC Fuse — PV Fuse & Photovoltaic Fuse to IEC 60269-1 & IEC 60269-6 Solar Fuse | PV Fuse | Photovoltaic Fuse | DC Fuse | 1000V DC Fuse | 1500V DC Fuse

Product Introduction

The Lawson LFPV range is a purpose-engineered family of Solar Fuse links and PV Fuse links specifically designed for the protection and isolation of photovoltaic string arrays in solar power installations. Available in two formats — the LFPV-32 (1000V DC, 10x38mm) and the LFPV-35 (1500V DC, 10x85mm) — the Lawson LFPV Photovoltaic Fuse range covers the full voltage spectrum of modern solar PV systems, from standard 1000V DC string systems through to the latest generation of high-voltage 1500V DC utility-scale solar installations.

Both products are certified DC Fuse links capable of interrupting the characteristic low overcurrents associated with faulted PV systems — including reverse current faults and multi-array faults — that standard AC or general-purpose DC fuses may fail to detect and clear reliably. Fully compliant with IEC 60269-1 and IEC 60269-6 — the international standards governing Photovoltaic Fuse performance — the Lawson LFPV range is the trusted Solar Fuse solution for solar installers, system integrators, and electrical contractors specifying certified string protection for residential, commercial, and utility-scale solar PV arrays.

Why a Dedicated Solar Fuse is Essential

Standard AC or general-purpose DC fuses are not suitable for photovoltaic string protection for two fundamental reasons. First, PV systems generate direct current — and DC arc interruption is inherently more demanding than AC arc extinction, because there is no natural current zero-crossing to aid arc suppression. A DC Fuse for solar applications must be specifically engineered and tested to interrupt DC arcs at the full system voltage — 1000V DC or 1500V DC — without risk of arc re-ignition or destructive failure.

Second, the fault currents associated with reverse current and multi-array faults in PV string arrays are characteristically low — often only 1.35 to 1.5 times the string short-circuit current — and a standard fuse may simply not detect and operate at these low overcurrent levels. Only a dedicated gPV Photovoltaic Fuse certified to IEC 60269-6 is specifically tested for these conditions and guaranteed to provide reliable protection.

Applications

The Lawson LFPV Solar Fuse, PV Fuse, and Photovoltaic Fuse range is specified in:

• Residential rooftop solar — LFPV-32 (1000V DC) for string fusing in domestic and small commercial combiner boxes
• Commercial rooftop solar — LFPV-32 (1000V DC) for multiple string fusing in commercial combiner and junction boxes
• Ground-mount utility-scale solar — LFPV-32 (1000V DC) and LFPV-35 (1500V DC Fuse) for large-format PV array string protection
• Solar energy storage systems (BESS) — DC fuse protection for battery string connections in solar-plus-storage installations
• On-grid solar inverter protection — string-level DC fusing on the inverter input
• Off-grid and hybrid systems — battery charge controller and inverter input protection in off-grid solar arrays
• High-voltage 1500V DC solar farms — the LFPV-35 1500V DC Fuse is the correct Solar Fuse for the latest generation of utility-scale solar installations operating at 1500V system voltage

Why Choose Lawson LFPV Solar Fuses?

Lawson Fuses has been manufacturing certified, performance-guaranteed fuse-links to international standards since 1938 — and the LFPV Solar Fuse and PV Fuse range brings this same engineering rigour and quality assurance to the solar energy sector. Both the LFPV-32 and LFPV-35 are manufactured under an ISO 9001 accredited quality management system with test facilities independently accredited to ISO/IEC 17025, ensuring consistent, documented performance in every DC Fuse that leaves the factory.

With IEC 60269-1 and IEC 60269-6 certification, gPV utilisation category, and the specific capability to interrupt low-level reverse current and multi-array fault currents, the Lawson LFPV Photovoltaic Fuse range provides the complete, certified Solar Fuse system that solar installers, system designers, and site engineers need to protect their PV investments.

The Lawson Type LFPV-32 is a Solar Fuse and PV Fuse in the industry-standard 10x38mm cylindrical format, rated at 1000V DC — the standard maximum DC voltage for conventional photovoltaic string systems. Covering 13 current ratings from 1A to 32A, the LFPV-32 Photovoltaic Fuse is the correct DC Fuse for protecting individual PV strings in combiner boxes and junction boxes across residential rooftop, commercial, and ground-mount solar installations at up to 1000V DC.

The Lawson Type LFPV-35 is the next-generation Solar Fuse and PV Fuse for the growing class of 1500V DC photovoltaic systems. As solar panel technology and system design evolves towards higher string voltages — driven by the efficiency and cost advantages of 1500V DC architecture in utility-scale and large commercial solar farms — the need for a certified 1500V DC Fuse for photovoltaic string protection has become essential.

The LFPV-35 Photovoltaic Fuse is a 10x85mm cylindrical fuse-link — longer than the standard 10x38mm format to accommodate the enhanced arc-interruption capability required at 1500V DC — and is specifically designed to interrupt the low overcurrent conditions of reverse current and multi-array faults in 1500V PV string arrays. Certified to IEC 60269-1 and IEC 60269-6 as a 1500V DC Fuse for photovoltaic applications, the LFPV-35 is the correct Solar Fuse for string protection in high-voltage solar power systems.

Full current rating schedule and technical specifications available in the Type LFPV-35 Product Information Sheet. Contact the Lawson Fuses sales team for current rating availability.

Q1. What is a Solar Fuse?

A Solar Fuse — also called a PV Fuse or Photovoltaic Fuse — is a fuse-link specifically designed for the protection of photovoltaic string arrays in solar power systems. Unlike standard AC or general-purpose DC fuses, a Solar Fuse must be rated for high-voltage direct current (1000V DC or 1500V DC), certified to IEC 60269-6 (the gPV utilisation category), and capable of interrupting the low-level overcurrents characteristic of reverse current and multi-array faults in PV string arrays. The Lawson LFPV-32 is a 1000V DC Solar Fuse (10x38mm) and the LFPV-35 is a 1500V DC Fuse (10x85mm), both certified to IEC 60269-1 and IEC 60269-6.

Q2. What is a 1500V DC Fuse and when do I need one?

A 1500V DC Fuse is a solar fuse rated for use in photovoltaic systems operating at up to 1500V DC system voltage — the latest generation of high-voltage PV architecture increasingly used in utility-scale and large commercial solar farms. 1500V DC systems allow longer string lengths, fewer combiner boxes, and reduced balance-of-system costs compared to 1000V DC systems, but they require fuse-links specifically rated and tested for 1500V DC arc interruption. The Lawson LFPV-35 (10x85mm) is the correct 1500V DC Fuse for photovoltaic string protection in these high-voltage systems.

Q3. What is the difference between the LFPV-32 and LFPV-35 Solar Fuses?

The LFPV-32 is a 1000V DC Solar Fuse in the standard 10x38mm cylindrical format, suitable for conventional PV string systems up to 1000V DC. The LFPV-35 is a 1500V DC Fuse in a longer 10x85mm format, designed for the latest generation of 1500V DC high-voltage solar installations. The longer body of the LFPV-35 accommodates the greater arc-interruption capability required at 1500V DC. Both are certified gPV Photovoltaic Fuse links to IEC 60269-1 and IEC 60269-6.

Q4. Why can’t I use a standard DC fuse in a solar PV system?

Standard general-purpose DC fuses are not suitable for solar PV string protection because they are not tested for the specific fault conditions of PV systems. PV faults produce characteristically low overcurrents (reverse current, multi-array fault) that a standard DC fuse may not reliably detect and clear. Additionally, standard DC fuses are typically rated at much lower voltages than the 1000V DC or 1500V DC levels found in modern solar string systems. Only a gPV Photovoltaic Fuse certified to IEC 60269-6 provides guaranteed protection against both the low-level fault currents and the high DC voltages of PV arrays.

Q5. What is a gPV fuse?

gPV is the utilisation category defined by IEC 60269-6 for Photovoltaic Fuse links used in the protection of solar PV energy systems. The “g” indicates full-range breaking capacity (protecting against both overloads and short circuits), and “PV” denotes photovoltaic application. A gPV Solar Fuse is specifically tested to interrupt the low overcurrents associated with reverse current and multi-array faults at the full rated DC voltage of the system — either 1000V DC or 1500V DC — providing complete certified protection for PV string arrays.

Q6. What current ratings are available for the LFPV-32 Solar Fuse?

The LFPV-32 PV Fuse (1000V DC, 10x38mm) is available in 13 current ratings: 1A, 2A, 3A, 4A, 5A, 6A, 8A, 10A, 12A, 15A, 20A, 25A, and 32A — covering all standard PV string current protection requirements. The correct current rating for a given PV string is typically determined by the string short-circuit current (Isc) and the maximum reverse current the string can experience under worst-case fault conditions.

Q7. What current ratings are available for the LFPV-35 1500V DC Solar Fuse?

Current rating availability for the LFPV-35 1500V DC Fuse (10x85mm) is available on request — please download the LFPV-35 Product Information Sheet or contact the Lawson Fuses sales team directly for the full current rating schedule and availability for your specific 1500V DC solar installation.

Q8. What fuse holder is compatible with the LFPV-32 10x38mm Solar Fuse?

The LFPV-32 Solar Fuse (10x38mm) is compatible with the Lawson MSC 101 modular cylindrical fuse holder (10×38 Fuse Holder, rated 32A) and other compatible DIN-rail mounted 10x38mm PV fuse holders rated for 1000V DC service. Always ensure the fuse holder is rated for the full 1000V DC system voltage — standard AC-rated fuse holders are not suitable for DC solar applications.

Q9. What fuse holder is compatible with the LFPV-35 1500V DC Fuse?

The LFPV-35 1500V DC Fuse (10x85mm) requires a compatible fuse holder specifically rated for 1500V DC and the 10x85mm fuse body format. Contact the Lawson Fuses sales team for guidance on compatible fuse holder solutions for 1500V DC PV string applications.

Q10. How do I order Lawson LFPV Solar Fuses?

The Lawson LFPV-32 Solar Fuse and LFPV-35 1500V DC Fuse range is available through the Lawson Fuses sales team and their network of authorised sales partners and electrical wholesalers across the UK. Contact Lawson Fuses directly for trade pricing, availability by current rating and voltage, and technical support for your solar PV installation or system design project.