Siemens 3RV2901-2A Auxiliary Contact Block 2 Form A

Siemens 3RV2901-2A is a side-mounted auxiliary contact block for the 3RV2 family of molded‑case circuit breakers, delivering two normally open (Form A) contacts that close when the associated breaker energizes to provide a signaling interface for control circuits. The unit attaches to the side of the breaker and uses spring‑type terminals suitable for 1.5 mm² conductors, enabling clean, low‑voltage wiring for auxiliary and control wiring. Its finger‑safe construction supports front‑accessible operation in panel installations, making it a reliable choice for status signaling, interlocks, and PLC feedback in motor control and automation cabinets. Typical applications include signaling breaker status to a PLC or interlocking logic to ensure proper sequencing, and Siemens explicitly lists it as an auxiliary switch block accessory for the 3RV2 circuit breakers.