Siemens contactor relay 230v ac 24v dc 3rh1 series siemens 3rh1140 1bb40 the siemens 3rh1140 1bb40 is a sirius contactor relay and forms part of the 3rh1 series it has been logically designed right down to the last detail from the basic units to the accessories the 3rh1 contactor relay is suitable for use in any climate and finger safe according to en 50274 the relay has screw terminalsthe 4no relay is supplied in the 24v dc voltage option and supplied in s00 size siemens 3rh1140 1bb