Siemens 5ST3014 Auxiliary Switch Low Output 2NO

Siemens 5ST3014 is a low-power auxiliary switch with two normally open contacts (2NO) designed to attach to Siemens miniature circuit breakers to provide a dedicated auxiliary signaling function without carrying main-load current. It is compatible with 5SL, 5SY, and 5SP miniature circuit breakers and pairs with the integrated switch 5TL1, RCBOs such as 5SU1, and fault-current devices like 5SV for enhanced protection schemes. The variant 5ST3014-2 includes a test button for functional verification, and the device supports a maximum mounting torque of 1 N·m. Common applications include status indication and signaling within protection assemblies for MCBs and RCBOs, where a low-power auxiliary contact is required for monitoring or interlock logic without influencing the main circuit.