Siemens 3RH2911-2XA22-0MA0 Auxiliary Switch Block

Siemens 3RH2911-2XA22-0MA0 is a front-mounted auxiliary switch block for SIRIUS 3RT2 contactors and 3RH2 relays that adds two normally open and two normally closed contacts to the control circuit. Mounted on the front of the partner contactor, it provides four auxiliary contacts at terminals 53/54, 61/62, 71/72, and 83/84, with the current path configured as 1 NO, 1 NC, 1 NC, 1 NO. It uses spring-loaded terminals for reliable connections and is rated for an insulation voltage up to 690 V with a 6 kV impulse withstand; the enclosure carries an IP20 protection rating. In operation, it supports up to 10,000,000 mechanical cycles and about 200,000 electrical cycles (AC-15, 230 V). Ambient operating temperature ranges from -25 to +60 C, with storage temperatures from -55 to +80 C. This auxiliary switch block expands the signaling capability of 3RT2 contactors and 3RH2 relays, enabling additional feedback and interlock options in control circuits.