Siemens 3RH2911-1HA11 Top Mount Auxiliary Contact Block

Siemens 3RH2911-1HA11 is a front-mount auxiliary contact block that adds a second independently wired NO/NC pair to compatible Siemens contactors, typically used with 3RT2 contactors and 3RH2 relays for control-circuit signaling. It provides one normally open (NO) and one normally closed (NC) contact, with screw terminals for the auxiliary circuit, and is rated for insulation up to 690 V with a 6 kV surge withstand. The device delivers a mechanical life of up to 10,000,000 switching cycles and an electrical life of about 200,000 cycles at AC-15, 230 V, ensuring long-term reliability in automation panels. Featuring a snap-on front-mount design for quick installation on suitable Siemens assemblies, it is a compact, two-pole auxiliary block suited to expanding control logic in motor control centers and industrial control panels.