Siemens 3VF9222 1BC10 Breaker Auxiliary Switch

Siemens 3VF9222-1BC10 auxiliary switch is a Form C SPDT signaling device designed as an optional contact block for Siemens Type 3VF2 circuit breakers. The module provides a single changeover contact (1 CO) that switches its output between normally open and normally closed states in response to the breaker mechanism, enabling clean status signaling for control systems, interlocks, and alarm circuits without interrupting the main power path. The 3VF9222-1BC10 designation identifies the exact accessory variant compatible with IEC 947-2 Type 3VF2 breakers, offering an compact auxiliary contact integration that mirrors the breaker’s operational position. Used in switchgear assemblies where indication of the breaker’s position is required in automation sequences, this auxiliary switch can be wired to PLCs or control relays to provide status feedback tied to the breaker’s closed or open state. As with Siemens accessories in the 3VF2 family, the 3VF9222-1BC10 is intended to accompany the main breaker assembly, ensuring coordinated signaling across devices in electrical protection schemes.