Siemens Contactor relay, screw, size S00, 3NO+1NC, 230VACContactor relays are switching devices for control and auxiliary circuits and are used for controlling, signaling and locking switching devices and switchgear. Naturally, SIRIUS 3RH2 contactor relays come with standard compliant connection designations and a connection system that saves both time and installation overhead. This makes them particularly suitable for practical applications. The 3RH2131 1AP00 contactor relays and size S00 motor contactors