Solar 1000V DC 10x38mm Fuse complying with IEC 60269-1 & IEC 60269-6

Solar DC Fuse – 1000V DC 10x38mm gPV Fuse to IEC 60269-1 & IEC 60269-6 – Type LFPV-32 Solar DC Fuse | PV Fuse | Solar Panel Fuses | 10×38 Fuse | gPV Fuse | PV Fuse Holder

Product Introduction

The Lawson Type LFPV-32 is a precision-engineered Solar DC Fuse specifically designed for the protection and isolation of photovoltaic string arrays in solar power installations. As a certified gPV Fuse in the standard 10×38 Fuse cylindrical format, rated at 1000V DC, the LFPV-32 is capable of interrupting the low overcurrents associated with faulted PV string arrays — including reverse current faults and multi-array faults — that standard AC or general-purpose DC fuses may fail to detect and clear reliably.

Available in 13 current ratings from 1A to 32A, the LFPV-32 Solar Panel Fuses are supplied complete with a compatible PV Fuse Holder in a compact DIN rail-mountable assembly — providing a ready-to-install, self-contained PV Fuse protection solution for combiner boxes, junction boxes, and inverter input protection in residential, commercial, and utility-scale solar PV systems. Fully compliant with IEC 60269-1 and IEC 60269-6, and CE and IEC 60269-6 certified, the Lawson LFPV-32 is the trusted Solar DC Fuse for solar installers and system integrators specifying certified string protection at 1000V DC.

Key Features

• Solar DC Fuse — purpose-designed for photovoltaic string protection at 1000V DC
• gPV Fuse utilisation category — full-range DC breaking protection for PV systems per IEC 60269-6
• 10×38 Fuse format (10mm x 38mm) — industry-standard cylindrical body
• Rated voltage: 1000V DC — suitable for standard 1000V DC PV string systems
• Current ratings: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 25, 32A — 13 ratings covering all standard PV string current requirements
• Breaking capacity: 20kA DC — rated for high fault current interruption in PV combiner box applications
• Maximum power dissipation: 3.5W — low thermal load within combiner box enclosures
• 1 Pole (1P) configuration
• Cable connection: 2.5mm² to 10mm² — suitable for standard PV string wiring sizes
• Working temperature: -30°C to +70°C — suitable for outdoor solar installations across all climates
• Relative humidity: ≤ 95% — suitable for humid and tropical environments
• IP20 rated — for installation within enclosures and combiner boxes
• Altitude: ≤ 2000m — suitable for highland and mountain solar installations
• DIN rail (Class III) mounting — via included PV Fuse Holder
• Installation environment: no obvious shock and vibration
• Compliant with IEC 60269-1 and IEC 60269-6 — CE certified
• Capable of interrupting reverse current and multi-array fault conditions
• Supplied with PV Fuse Holder — compact DIN rail assembly (W: 18mm, H: 79mm, L: 62mm)

Why a Dedicated Solar DC Fuse is Essential

Solar PV systems generate direct current — and DC arc interruption is inherently more demanding than AC, because there is no natural current zero-crossing to aid arc suppression. A Solar DC Fuse must be specifically engineered and tested to interrupt DC arcs at the full 1000V DC system voltage without risk of arc re-ignition.

Furthermore, PV string faults produce characteristically low overcurrents — typically only 1.35 to 1.5 times the string short-circuit current — that a standard DC fuse may simply not detect and operate on. Only a dedicated gPV Fuse certified to IEC 60269-6 is specifically designed and tested to interrupt these low-level fault currents reliably, making the Lawson LFPV-32 Solar Panel Fuses the only technically correct choice for PV string protection.

Applications

The Lawson LFPV-32 Solar DC Fuse and PV Fuse range is specified in:

• PV string protection — individual string fusing in solar combiner boxes and junction boxes
• Residential rooftop solar — string fusing in domestic and small commercial systems
• Commercial rooftop solar — multiple string fusing in commercial PV array combiner boxes
• Ground-mount utility-scale solar — string-level fusing in large-format PV arrays
• On-grid solar inverter input protection — DC input fusing ahead of string and central inverters
• Off-grid and hybrid solar systems — battery charge controller and inverter input protection
• Solar energy storage (BESS) — DC fuse protection for battery string connections

Also Available — LFPV-35 for 1500V DC Systems

For the latest generation of high-voltage 1500V DC photovoltaic installations, Lawson also offers the Type LFPV-35 — a 10x85mm Solar DC Fuse rated at 1500V DC for utility-scale solar farms operating at the higher 1500V string voltage. Contact the Lawson Fuses sales team or visit the LFPV-35 product page for full details.

Technical Specifications

Connections and Installation

Physical Dimensions

Q1. What is the Lawson LFPV-32 Solar DC Fuse?

The Lawson LFPV-32 is a Solar DC Fuse in the standard 10x38mm cylindrical format, rated at 1000V DC with a 20kA breaking capacity, available in 13 current ratings from 1A to 32A. It is a certified gPV Fuse compliant with IEC 60269-1 and IEC 60269-6 — specifically designed to protect photovoltaic string arrays against reverse current and multi-array fault conditions. It is supplied with a compact DIN rail-mountable PV Fuse Holder.

Q2. What is a 10×38 Fuse and why is it used in solar PV applications?

A 10×38 Fuse is a cylindrical fuse-link measuring 10mm in diameter and 38mm in length — the most widely used cylindrical fuse format in solar PV combiner boxes and junction boxes worldwide. The Lawson LFPV-32 10×38 Fuse is specifically rated at 1000V DC and certified as a gPV Fuse to IEC 60269-6, making it the correct Solar DC Fuse format for standard PV string protection applications in residential, commercial, and utility-scale solar installations.

Q3. What does gPV mean and why does my Solar DC Fuse need to be gPV rated?

gPV is the utilisation category defined by IEC 60269-6 specifically for Solar Panel Fuses used in photovoltaic energy systems. The “g” indicates full-range breaking capacity (protecting against both overloads and short circuits), and “PV” denotes photovoltaic application. A gPV Fuse is specifically tested to interrupt the characteristically low overcurrents of PV string faults — typically reverse current and multi-array faults — at the full 1000V DC system voltage. Standard DC fuses are not tested for these conditions and may fail to operate, leaving PV strings unprotected.

Q4. What current ratings are available for the LFPV-32 Solar DC Fuse?

The LFPV-32 PV Fuse 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 rating for a given PV string is determined by the string short-circuit current (Isc) and the maximum reverse current that the string can experience under worst-case fault conditions.

Q5. Does the LFPV-32 come with a PV Fuse Holder?

Yes. The LFPV-32 Solar DC Fuse is supplied complete with a compatible PV Fuse Holder in a compact DIN rail-mountable assembly measuring 18mm (W) x 79mm (H) x 62mm (L). The fuse holder accepts cable connections from 2.5mm² to 10mm² and mounts on a standard 35mm DIN rail — providing a ready-to-install, self-contained Solar DC Fuse protection solution for combiner boxes and solar panel protection enclosures.

Q6. What is the breaking capacity of the LFPV-32 Solar Panel Fuses?

The Lawson LFPV-32 Solar DC Fuse has a breaking capacity of 20kA DC at 1000V DC — sufficient to safely interrupt the maximum prospective fault currents likely to be encountered in PV string combiner box applications.

Q7. What temperature range is the LFPV-32 Solar DC Fuse rated for?

The LFPV-32 gPV Fuse is rated for a working temperature range of -30°C to +70°C — making it suitable for solar installations across a wide range of climates, from cold northern locations to hot equatorial and desert environments where high ambient temperatures are a design consideration.

Q8. What cable sizes are compatible with the LFPV-32 PV Fuse Holder?

The PV Fuse Holder supplied with the LFPV-32 10×38 Fuse accepts cable connections from 2.5mm² to 10mm² — covering the standard range of PV string cable sizes used in residential and commercial solar installations.

Q9. Can the LFPV-32 Solar DC Fuse be used at altitude? Yes.

The LFPV-32 Solar Panel Fuses are rated for use at altitudes up to 2000m — making them suitable for highland and mountain solar installations such as those increasingly deployed in elevated terrain across the UK, Europe, and internationally.

Q10. Is the Lawson LFPV-32 available for 1500V DC solar systems?

No — the LFPV-32 Solar DC Fuse is rated at 1000V DC and is suitable for standard 1000V DC PV string systems only. For 1500V DC high-voltage solar installations, Lawson offers the Type LFPV-35 — a 10x85mm Solar DC Fuse rated at 1500V DC for utility-scale solar farms and large commercial PV systems operating at the higher 1500V string voltage. Contact the Lawson Fuses sales team or visit the LFPV-35 product page for full details.