Square D B0.44 is a 480V thermal protection device described as a thermal unit with melting‑alloy trip characteristics (Type S, Type B) and a class 20 rating. It is specified for a nominal current range of 0.31–0.34A, providing isolation when the device temperature or current reaches the melt threshold. Used in Square D heater element and motor‑control assemblies, the B0.44 serves as a dedicated thermal interrupter within legacy equipment and related control circuits. The part remains listed in Square D catalogs and is available through distributors as a replacement component for compatible Square D systems.
