Siemens 3RH2911-2HA11 Auxiliary Contact Block

Siemens 3RH2911-2HA11 is a front-mounted auxiliary contact block for Siemens Sirius 3RH/3RT series contactors, delivering one normally open (NO) and one normally closed (NC) auxiliary contact in a compact 4-pole module that mounts on 3RT2 contactors and 3RH2 relays. It uses spring-loaded terminals and offers IP20 protection with an insulation rating up to 690 V; the operating temperature range is -25 to +60 C, and it supports a mechanical life of about 10 million cycles and an electrical life up to about 200,000 cycles at AC-15/230 V. The device provides a front-access signaling path (1 NO + 1 NC) and is designed to integrate with the Siemens Sirius control architecture for auxiliary switching tasks.