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The RS ProSolid State Relay family designed to switch various loads such as heating elements， motors and transformers. The relay is capable of switching high voltages up to 600 VACrms. The built-in varistor secures transient protection for heavy industrial applications.3 phase 55A per phase solid state relay Control voltage: 24-275 VAC24-50 VDC Zero Switching Rated operational voltage: 42-530VACrms Blocking Voltage 1200Vp Non rep surge current t=10ms 600Ap Drop out voltage 1.2VDC Input current <23mA On-state Voltage drop1.6Vrms Industrial housing Built in LED Built in varistor， suitable for heavy applications Response time pickup @50Hz= 10ms Operating temp: -300℃ to 800℃ (-220°F to 176°F)