The ABB ESB25 installation contactors are used to control single and three-phase loads up to 25 A and can be operated by AC or DC. These contactors are made for use in household applications as well as in industrial environments. The following benefits are provided: Hum-free operation, low power consumption and integrated overvoltage protection. Rated Operational Voltage:Main Circuit 220 V DC Main Circuit 400 V AC Rated Control Circuit Voltage (Uc):24 V Rated Frequency (f):Control Circuit 400 Hz Control Circuit 50 Hz Control Circuit 60 Hz Control Circuit DC Main Circuit 50 Hz Main Circuit 60 Hz Main Circuit DC Rated Operational Current AC-1 (Ie):(NC) 30 A (NO) 40 A Rated Operational Current AC-3 (Ie):(230 V) Single Phase, NO 22 A (400 V) Three Phase, NO 22 A