Siemens 3RV1901-1D Contact Block

Siemens 3RV1901-1D is an auxiliary contact block for Sirius 3RV1 motor protectors, delivering a front-mount SPDT contact (one normally open and one normally closed) to provide an auxiliary signaling path alongside the main power contacts. Designed for transverse front mounting on Sirius Classic devices, it mounts on the protector to offer a compact, integrated point for status feedback or interlock signaling in motor-start circuits. With a single Form C contact arrangement, the block supports monitoring of the protector’s state and can feed PLC inputs or local indicators without altering the protected circuit. As part of the Sirius Classic ecosystem, the 3RV1901-1D shares the same mounting footprint and wiring conventions, enabling straightforward accessory integration for enhanced control logic and safety signaling.