The Siemens 3VU2912-4DB4 is a 24 V DC shunt release designed for the 3VU2.1, 3VU2.2, and 3VU2.3 series of circuit breakers. Its job is simple: when you energize the release coil, it mechanically trips the breaker — no arcing, no delay. That makes it the standard choice for emergency-stop circuits, undervoltage protection, or remote-trip functions where you need a clean, fast opening of the motor circuit.
This shunt release mounts directly onto the 3VU2 breaker frame — it clips into the designated accessory slot on the left side of the breaker, below the arc chamber. No additional wiring bracket or DIN-rail adapter is needed; the release's terminals are accessible with the breaker panel-mounted.