Square D LC11021 Shunt Trip Circuit Breaker Accessory

The Square D LC11021 shunt-trip accessory is designed for legacy LC-frame molded‑case circuit breakers, adding remote-trip capability from a separate control circuit to allow immediate disconnection without needing to access the main panel, and it integrates with Square D's LC family to extend protective reach. The shunt-trip coil is rated for 120 to 240 VAC and operates at a standard 50/60 Hz, so a wide range of control-signal sources—such as supervisory circuits, interlocks, or alarm-triggered relays—can energize the coil to trip the breaker. As a dedicated LC-frame accessory, LC11021 provides a way to implement remote isolation in safety-critical electrical distributions, enabling fast shutdown of a protected circuit in response to an external fault or command. Because it is an official Square D component for legacy LC-frame protection, LC11021 is intended to work with compatible LC-series breakers and related accessories, preserving the integrity of the original protection scheme. The 120–240 V, 50/60 Hz compatibility covers common industrial control voltages, ensuring the remote-trip solution remains versatile across facilities while avoiding changes to the primary protection device.