Mersen PV Fuse

Mersen PV Fuses

Mersen photovoltaic (PV) fuse series was engineered and designed specifically for the protection of photovoltaic systems. Its enhanced fuse construction makes it ideal for constant temperature and current cycling withstand adding to system longevity. The photovoltaic fuses allow for safe circuit interruption under typical low fault current conditions produced by PV arrays. Protect your off-grid or grid tied PV system from unexpected ground faults and line faults using Mersen’s HelioProtection fuse line.

Solar fuses, also known as photovoltaic (PV) fuses, protect solar panels, inverters, and control boxes from overcurrent. These fuses interrupt low-fault currents, such as reverse currents and multi-array faults, preventing damage to PV systems. Mersen’s HP15M photovoltaic (PV) fuse series was engineered and designed specifically for the protection of photovoltaic systems. Its enhanced fuse construction makes it ideal for continuous temperature and current cycling withstand adding to system longe

A Century of Global Expertise: Mersen Protects Your Solar Power Investment

Maximize the reliability of your solar power system with Mersen’s advanced electrical components, designed specifically for photovoltaic (PV) applications. Solar energy generation is dependable, but only when properly protected. Mersen offers a comprehensive range of electrical protection solutions, including fuses, fuse holders, heatsinks, wire management, disconnect switches, laminated bus bars, and surge protective devices. Our products are engineered to safeguard wiring between strings and protect critical system components.

With Mersen’s innovative HelioProtection product line, faulty circuits are safely isolated, extending system life and ensuring reliable, uninterrupted power generation. Leveraging over 100 years of experience and dedication to electrical safety, Mersen delivers innovative solutions and technical support to solar power designers, integrators, installers, and equipment manufacturers.

Introducing Mersen’s HelioProtection® Brand

Inspired by the Greek sun god Helios, the HelioProtection brand embodies Mersen’s commitment to the solar industry. Mersen’s products are rigorously tested and certified to meet the latest PV industry standards, ensuring safety, reliability, and top-tier performance. Beyond compliance, Mersen subjects their products to stringent quality controls and rigorous electrical, mechanical, and environmental testing.

HelioProtection Brand Promise:

• Expertise in solar power applications
• Premium solutions for the PV industry
• Uncompromised safety and reliability

Mersen: The Benchmark for the PV Industry

• First to market with UL 2579 Listed products
• Key contributor to shaping new safety standards
• The only manufacturer offering comprehensive solutions for overcurrent protection, surge protection, laminated bus bars, and cooling systems tailored for the PV market.

Key Features of Mersen Solar Fuses:

• Low fault current interrupting capability
• Durable construction for enhanced system longevity
• Temperature cycle withstand capability
• First UL-listed solution for PV applications
• Globally recognized and accepted

Notable Mersen Products:

• HP10M, HP15M, HP25M, HP30M Fuses: Designed for 1000VDC and 1500VDC PV systems.
• HP15P40 Solar Fuses (1500VDC): Handles higher amperage demands, with a design that meets the harsh conditions of high-amperage PV circuits.
• HP6M, HP6M20 20A 600VDC Fuse: Offers reliable protection for PV systems with low minimum breaking capacity, extending the lifespan of off-grid and grid-tied systems.

Understanding Key Standards for Photovoltaic System Protection

• UL 2579 – Fuses for Photovoltaic Systems: This standard is specifically designed for fuses used in photovoltaic (PV) circuit protection. Unlike UL 248 for “Low Voltage Fuses,” UL 2579 requires additional testing to simulate the conditions of PV installations. These tests include:

  1. Verification of Freedom from Thermally Induced Drift
  2. Functionality at Temperature Extremes
  3. Current Cycling.

• UL 4248-18 – Photovoltaic Fuse Holders: This standard applies to fuse holders rated up to 1500VDC, intended for use with photovoltaic fuses as defined in UL 2579.

• UL 98B – Enclosed and Dead-Front Switches for Photovoltaic Systems: This covers enclosed and dead-front switches rated up to 1000VDC, designed for use in DC PV systems, in compliance with Article 690 of the National Electrical Code.

International Electrotechnical Commission (IEC) Standards

• IEC 60269-6 – Fuse-links for Photovoltaic Energy Systems: This standard outlines additional requirements for fuse-links protecting PV strings and arrays in circuits with nominal voltages up to 1500VDC. Fuses compliant with this standard are marked “gPV,” indicating full-range DC breaking capacity for PV systems.

With over 125 years of expertise, Mersen has been a leader in the electrical power industry, continually expanding its portfolio and capabilities through key acquisitions and innovations. Today, Mersen remains a trusted name in the protection of photovoltaic systems worldwide.

Mersen Photovoltaic fuse blocks and holders products

Mersen’s circuit protection products and services prioritize minimizing downtime, enhancing workplace safety, and ensuring Code compliance for industrial/MRO, OEM, and construction markets. Offering electrical fuses, fuse blocks, holders, and engineering services, the Mersen brand delivers reliable protection.

HelioProtection® HP10J Fuses – Photovoltaic: Mersen’s HP10J photovoltaic (PV) fuse series is designed specifically for DC Recombiner Boxes in the protection of 1000VDC photovoltaic systems. Its robust construction makes it ideal for continuous temperature and current cycling withstand adding to system longevity. The 1000VDC rated HP10J designed for low minimum breaking capacity capabilities of 1.35 times the fuse rated current value, allows for safe circuit interruption under typical low fault current conditions produced by PV arrays. Protect your off-grid or grid tied PV system from unexpected ground faults and line faults using Mersen’s HelioProtection fuse line.

HelioProtection® HP10M Fuses – Photovoltaic: Mersen’s HP10M photovoltaic (PV) fuse series was developed specifically for the protection of PV string wiring for 1000VDC industrial rooftop and utility scale photovoltaic systems. Its robust construction makes it ideal for continuous temperature and current cycling withstand adding to system longevity. The 1000VDC rated HP10M, designed for low minimum breaking capacity capabilities of 1.35 times the fuse rated current value, allows for safe circuit interruption under typical low fault current conditions produced by PV arrays. In addition to the standard ferrule terminal, parts are available with CrimpCap terminals for in-line fuse applicaitons. The unique wire crimp terminal (CC option) permits solderless wire-to-fuse connection for overmold encapsulations of fuse and wiring. Protect your off-grid or grid-tied PV system from unexpected ground faults and string faults using Mersen’s HelioProtection fuse line.

HelioProtection® HP10NH, Photovoltaic fuse-links gPV 1000VDC: The Mersen HP10NH photovoltaic (PV) fuse series is specifically designed to protect PV systems. Helio-Protection HP10NH fuse links safeguard cables in a PV string during short circuits in panels, serving as the main fuse. This globally accepted gPV fuse range expands Mersen’s PV fuse offering and complies with IEC 60269-6 and UL 2579 standards. These fuses are also available with bolted blades for direct mounting.

HelioProtection® HP15MxxR 1500VDC Solar Fuses Gen2: Mersen’s GEN2 HP15M photovoltaic (PV) fuse series is engineered to withstand the demanding temperature and current cycling of PV systems. Tested rigorously, GEN2 fuses offer enhanced reliability with a 1500VDC rating and a low minimum breaking capacity of 1.35 times the fuse’s rated current, ensuring safe circuit interruption under low fault current conditions. Alongside the standard ferrule terminal, Crimp Cap terminals are available for in-line applications, enabling solderless wire-to-fuse connections for overmold encapsulation. Protect your off-grid or grid-tied PV systems from unexpected faults with Mersen’s HelioProtection fuse series.

HelioProtection® HP15NH, Photovoltaic fuse-links gPV 1500VDC

HelioProtection® HP15Pxx 1500VDC Solar Fuses 20x65mm

HelioProtection® HP6J Fuses – Photovoltaic

HelioProtection® HP6M Fuses – Photovoltaic

HelioProtection® HPJ Fuse Holders – Photovoltaic

HP15FHM32 and US15M1HEL HelioProtection® Fuse Holders for PV Applications

HP15FHP80 HelioProtection® Fuse Holders for PV Applications

HP15G 1500VDC Class G (10x57mm) Photovoltaic Fuses

PV Modular fuse-holder CUS101HEL: The innovative Modulostar range of Mersen fuse-holders, including the CUS101HEL series, is specifically designed to protect PV systems. These modular fuse-holders are finger-safe to an IP20 protection grade under IEC and UL standards, allowing fuse changes with a simple flick. The CUS101HEL series is available in a 1-pole design, with or without a visual blown fuse indicator. Made from durable thermoplastic material, they are ideal for use with Mersen HP6M and HP10M fuse-links.

USGM – Midget: Mersen’s USGM series fuse holders provide a highly efficient, time-saving, and reliable solution. As the first to integrate screw-less, spring pressure wire termination technology into a power fuse holder, Mersen offers the best of both technologies. This innovation combines the safety, ease-of-use, labor savings, and reliability of UltraSafe fuse holders with the convenience of spring pressure technology.

USM – Midget: Mersen’s USM Series UltraSafe Modular Fuse Holders offer enhanced safety for Midget 1-1/2″ x 13/32″ AC and DC-rated fuses up to 30 amperes. Certified as “Finger-safe” under IEC and DIN standards with an IP20 protection rating, they allow safe fuse changes with a simple flick. Available in 1, 2, 3, or 4 poles, they can include visual blown-fuse indicators and can be field-assembled using pin-tie handles. UltraSafe holders save up to 15% mounting space and easily snap onto 35mm DIN-rails, speeding up panel assembly. Made from durable polyamide, they offer superior insulating properties.