PROJOY Safety Switch PEFS-EL50H-8(P2) 4-STRING

The PROJOY PEFS-EL50H-8 fire safety switch (4-string variant) is an isolation DC switch designed for photovoltaic installations, intended for quickly disconnecting PV circuits in emergency situations (e.g., rescue services actions). The device ensures automatic disconnection of PV circuits, isolation of panels, and protection of the installation during a fire or service inspections.

Manufacturer Information

The manufacturer of the switch is Projoy Electric — a company specializing in protective equipment for DC systems in photovoltaic systems. Projoy offers solutions intended for commercial and large-scale applications, focusing on safety, certification, and compatibility with existing photovoltaic installations.

Selected Electrical Parameters

• Circuit voltage (Vdc): 300–1500 Vdc
• Nominal switch current: 50 A (variant EL50H)
• Number of strings / inputs: 4 strings (4-string variant)
• Type of wiring / connectors: prepared holes and MC4 connectors (according to variant P2)
• Leakage / triggering current of the isolator: typical values for the series: nominal isolator current ~30 mA, average triggering/engaging current of the isolator ~100 mA (information consistent with the PEFS series catalog)
• Nominal AC communication voltage: 230 Vac (auxiliary power supply for auxiliary devices)
• Communication interface / auxiliary power supply: 24 Vdc / 300 mA max (control/communication input)
• Operating temperature range: -20°C to +50°C, automatic switch off at housing temperature +70°C
• Protection level: IP66

Mechanical Parameters

• Housing: plastic housing / steel sheet depending on the variant, design prepared for installation with MC4 connectors
• Dimensions (approximate, mm): width ~437 mm, total height ~263 mm, depth ~90–100 mm (dimensions resulting from technical drawings of PEFS variants)
• Installation: mounting holes according to the technical drawing, possibility of wall or distribution cabinet mounting
• Weight: the weight of the device has not been clearly stated in the sheet; typical for modules of this class (the stated weight should be confirmed in the manufacturer's technical document)
• Additional mechanical features: breathing valve to prevent condensation inside the housing; prepared cable entries and the possibility of using MC4 connector sets