Siemens 3RH2911-1HA13 Soft Starter For AC Motors

Siemens 3RH2911-1HA13 is an auxiliary switch accessory for Sirius contactors, delivering one normally open and three normally closed contacts in a compact, front-mounted module. Designed for use with 3RT2 motor contactors and 3RH2 auxiliary relays, it attaches to the front of the device to add signaling and interlocking capabilities without increasing panel depth. The unit uses screw terminals for secure wiring and provides four discrete current paths: 1 NO and 3 NC, arranged to support signaling, PLC feedback, and interlocking logic in motor-control circuits. Compatible with Siemens size S0/S00 contactors in Sirius installations, this accessory helps maintain a neat panel layout while expanding control options. Common applications include signaling machine status, interlocks, and control feedback for start/stop sequences in AC motor control panels.