Square D AR2.24 Contactor 24 VAC Coil For 480V Load

AR2.24 is an ambient-compensated, bimetallic thermal overload unit (Class 20) in the Square D AR-series motor starters. This replacement heater element plugs into AR assemblies and supports either manual- or auto-reset protection, allowing you to choose how the device resets after an overload event. It trips at a fixed current threshold and responds to ambient temperature, with a trip current around 1.47–2 A, providing reliable motor protection in industrial control circuits. As a dedicated AR-series protective element, the AR2.24 is designed to accompany Square D contactors to guard motors and wiring against overheating under fault conditions. Suppliers describe AR2.24 as a replacement heater element for AR2.24 assemblies, used to maintain protection without replacing the entire starter.