Square D 31071-964-50 Unlatch Coil 120V AC For Latching Relay

Square D 31071-964-50 Unlatch Coil is a 120 VAC unlatch coil designed for use with Square D latching relays in the company’s NEMA‑style relay families. The part number 31071-964-50 identifies a replacement coil that provides the reset function to release a latched relay when energized. As an unlatch coil, it is used in two‑coil latch configurations where a separate unlatch input is required to return the relay to its de‑energized state. This coil is intended for compatibility with Square D relays that require an unlatch coil to pair with a latch coil, enabling independent set and reset control in industrial control panels and automation circuits. The 120 V AC rating aligns with common factory control voltages, supporting applications such as signaling, sequencing, and safety interlock logic where a defined latch/unlatch sequence ensures reliable switching action. When replacing, verify that the target relay family expects an unlatch coil of 120 VAC and that the relay design indeed employs a separate unlatch path alongside its latch coil to maintain proper operation.