Fire safety switch PROJOY PEFS-EL50H-6 P2 (MC4) for 3 strings PEFS-EL50H-6-P2

Advanced Fire Protection for Photovoltaic Installations

The PROJOY PEFS-EL50H-6(P2) fire safety switch is a key element in protecting photovoltaic installations against fire hazards and ensuring safe working conditions for service teams and firefighters. The device is specifically designed for medium-sized PV systems supporting up to three photovoltaic panel strings, offering comprehensive protection in emergency situations.

The switch operates on the principle of automatic DC circuit disconnection upon detection of AC network issues or exceeding the critical temperature of 70°C. This eliminates the risk of electric shock during firefighting operations and protects valuable equipment from damage caused by sudden voltage loss.

Automatic Operation and PV System Protection

The device's operation mechanism is based on intelligent AC power monitoring. When firefighters or service personnel disconnect the AC power supply (e.g., via an emergency switch), the PEFS switch automatically detects the network failure and, after 5 seconds, immediately disconnects all three DC circuits of the photovoltaic panels.

This functionality provides dual protective benefits. First, it ensures complete safety for rescue teams by eliminating high DC voltage in the range of 600-1500V, which poses a lethal threat during firefighting on roofs with PV installations. Second, it protects the inverter from damage resulting from sudden AC voltage disconnection, significantly extending the service life of costly equipment.

The device is completely maintenance-free - it requires no manual resetting or additional configuration. Upon restoration of AC power, it automatically restores DC connections, ready for normal operation of the photovoltaic system.

Specifications and Technical Capabilities

The switch is adapted for operation in the most demanding conditions. It supports DC voltages up to 1500V DC and currents up to 50A per string, making it compatible with modern high-power photovoltaic installations. The operating temperature range is from -20°C to +50°C, with a maximum operating temperature before automatic shutdown of +70°C.

The enclosure with an IP66 protection class ensures full resistance to weather conditions - dust, rain, and intense sunlight do not affect the proper functioning of the device. The materials used in the construction are fire-resistant class V-0 and UV-resistant, guaranteeing long-term parameter stability even during years of exposure to external factors.

The device dimensions are 375 × 224 × 95 mm, and its weight is approximately 2.5 kg, facilitating installation even in hard-to-reach roof locations.

Compliance with Standards and Quality Certificates

The product meets the requirements of the highest international standards - it holds CE, TUV, CB, SAA, and UL certificates, confirming full compliance with European standards and global electrical safety norms.

Particularly important is its compliance with the amendment to the Construction Law effective from September 2020 for installations with power greater than 6.5 kW. The device has a positive opinion from Fire Safety Experts and complies with EN standards regarding electrical apparatus.

The switch can be used as part of a comprehensive PV safety system together with MC4 connection boxes or traditional cable solutions - all mounting variants are available in the manufacturer's offer.