Fire Protection Switch – ONCCY – ERS50-8-MC4 – 4 strings

ERS50-8-MC4 is a safety disconnect switch (fire protection switch) designed for photovoltaic installations, intended for the safe disconnection of DC circuits and maintaining energy from capacitors. The device supports connections using MC4 connectors and is offered with a 5-year warranty.

The manufacturer of the device is ONCCY, specializing in solutions for PV installations. The manufacturer's datasheet provides electrical and mechanical parameters of the device, information on the operating and storage temperature range, and data regarding the connection method and net weight.

Electrical and Technical Parameters

• PV circuit voltage: 300–1500 V DC
• PV circuit current: 9–55 A DC
• Number of PV circuits (strings): 1/4 (the ERS50-8-MC4 version supports 4-string connections)
• Control voltage: 100–270 V AC, nominally 220–240 V / 50 Hz
• Power consumption in the ON state: 1 W
• Control contact (FB1, FB2): max. 60 V, 400 mA
• Actuator element compliant with standard: IEC 60947-1 & 3 (marking on the datasheet: IEC 60947-1&3)
• Degree of protection: IP65

Mechanical Parameters and Operating Conditions

• Dimensions (approximate from drawing): length 389 mm (external), internal length 370 mm
• Height: 230 mm (according to drawing)
• Depth: 88 mm
• Mounting: mounting holes Ø6 mm (according to drawing)
• Connection: cable 3 x 0.75 mm², length 1 m
• Storage temperature range: -40 °C ÷ +85 °C
• Operating temperature range: -20 °C ÷ +50 °C
• Maximum temperature above which disconnection occurs: 70 °C
• Net weight: 2.1 kg