Schneider Electric B2.40 Overload Relay Thermal Unit

Schneider B2.40 Overload Relay Thermal Unit is a thermal overload protection device designed to guard motors in electrical control circuits. This unit operates as part of an Schneider motor protection scheme, monitoring current draw and providing time-delayed disconnect signals to the associated contactor when an overload condition is detected. The B2.40 designation identifies a specific model within Schneider’s B2 overload relay family, intended for integration in panel-mounted control systems that require reliable thermal protection for rotating equipment. In typical installations, the relay is paired with a compatible contactor and control circuit to block motor operation during sustained overloads, helping prevent winding damage, reduced efficiency, and premature bearing wear. Because overload relays are model-specific, refer to the B2.40's installation and operation instructions for exact wiring diagrams, trip characteristics, and mounting requirements. This component is commonly used in industrial automation environments to protect AC motors in machines, conveyors, pumps, fans, and similar equipment where abrupt current spikes can occur.