Schneider Electric AR437 Thermal Overload Heating Element

Schneider Electric's AR437 thermal overload heating element is a replacement thermal unit for Square D AR-series overload relays and motor starters, used to protect motors from overheating due to overload currents. Marketed as part of the AR4.37 family, this heating element relies on a melting alloy inside the unit to trip the relay when the designated current is exceeded. It is intended for use in AR-series protection assemblies within industrial control panels and motor control centers, providing the essential heat-sensing element that enables reliable overload protection alongside compatible Square D components.