Photovoltaic systems make an important contribution to the energy transition. However, as the systems operate outdoors, they are particularly susceptible to overvoltage. Mersen’s HelioProtection program protects PV systems from voltage spikes caused by lightning strikes or grid fluctuations, for example. It increases the operational reliability and efficiency of solar systems.
At the heart of the HelioProtection program are the DC Surge-Trap® Series: a complete range of lightning current and surge protective devices engineered for all types of photovoltaic (PV) installations: utility-scale farms, rooftop systems, and off-grid self-consumption setups – particularly those equipped with external lightning protection systems (LPS). These combined Type 1+2 / Class I + II devices are designed to discharge direct lightning currents and protect against induced voltage surges – without the need for additional backup fuses, even in the presence of high short-circuit currents typical in PV environments. Fully compliant with international IEC/EN standards and the UK-specific BS 7671:2018 regulation, they ensure high-performance protection across global markets.
The DC Surge-Trap® units feature a compact, plug-in DIN rail format for fast, space-saving installation. Their reversible chassis for top or bottom cable entry, along with visual and remote end-of-life indicators, greatly simplifies maintenance and reduces system downtime.
Beyond surge protection, Mersen offers the solar industry’s most comprehensive portfolio of PV electrical protection solutions – including DC fuses and fuse holders, PV string fuses, NH fuses, and disconnectors. As the only supplier to provide a full ecosystem of fuses, surge protection devices, laminated bus bars, capacitors, and cooling systems for power electronics, Mersen is uniquely positioned to support PV system manufacturers with integrated, high-reliability solutions.
In its function as Board member of Current OS and active member of ODCA Mersen is helping shape the future of DC power distribution. As the market shifts towards higher voltages around 2000 VDC, Mersen is at the forefront of developing innovative protection solutions to meet the evolving demands of energy storage, e-mobility, and renewable applications. With its deep expertise in electrical safety, the company is helping manufacturers design more compact, efficient, and reliable systems. Mersen’s commitment to innovation positions it as a key enabler in this new era of high-voltage DC architectures.
Visit Mersen at Solar & Storage from 23 to 25 September 2025 in Birmingham at stand P68.
