The ABB ESB20 installation contactors are used to control single loads up to 20 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 250 V AC Rated Control Circuit Voltage (Uc):24 V Rated Frequency (f):Control Circuit DC Control Circuit 50 Hz Control Circuit 60 Hz Control Circuit 400 Hz Main Circuit DC Main Circuit 50 Hz Main Circuit 60 Hz Rated Operational Current AC-1 (Ie):(NC) 20 A (NO) 20 A