Siemens 3RH2911-2FB22 is a front-mounted auxiliary switch block for Sirius contactors, delivering four auxiliary contacts: two normally open (NO) and two normally closed (NC). It is designed to mount on Siemens 3RT2 contactors and 3RH2 relays, and features spring-loaded terminals for reliable connections to the control circuit, with terminal pairs labeled.3/.4,.1/.2,.5/.6, and.7/.8. The auxiliary block supports signaling at voltages up to 690 V AC and up to 250 V DC, enabling safe feedback of contactor status in machine controls.
