Schneider Electric FB34.1AK Thermal Overload Relay

Schneider Electric FB34.1AK Thermal Overload Relay is a Class 10 manual-reset thermal unit in the FB34 family designed to protect motors from overload by sensing running current and interrupting the circuit when the preset limit is exceeded. The FB34.1 designation corresponds to a nominal motor current range of about 25.6 to 26.0 A, making it suited for mid-range full-load currents and for protection of motors used in pumps, fans, conveyors, and similar loads. As a manual-reset device, the relay requires a deliberate reset after cooling, helping to prevent immediate restart and potential equipment damage. This overload unit is part of Schneider Electric's Square D legacy product line and is typically paired with compatible contactors or motor starters in control panels or motor control centers to deliver integrated motor protection, including protection for hermetically sealed or submersible pump motors as described in FB thermal unit guidance. When selecting this variant, verify the trip class (Class 10), current rating, and mounting compatibility with the adjoining starter to ensure proper protection for the motor.