Auxiliary Contact Block for 3RT2 and 3RH2
The Siemens 3RH2911-2HA31-Z X95 is an auxiliary switch block that mounts on the front of 3RT2 contactors and 3RH2 contactor relays, providing 3 normally-open and 1 normally-closed contact set for signaling or interlocking in a motor control center. The contacts are rated for switching control circuits and are terminated with spring-loaded (cage-clamp) terminals, which speeds wiring and resists loosening under vibration compared to screw terminals.
RoHS compliance is confirmed from October 2009 onward, and the part carries no export control restrictions (AL: N / ECCN: N), simplifying cross-border procurement.
Contact Configuration and Wiring
The contact arrangement is 3 NO + 1 NC, with the NC contact on the first pole position (current path identified as 1 NC, 1 NO, 1 NO, 1 NO). This is a common pattern for signaling a contactor's energized state while providing one break contact for safety interlocks.