Eaton Cutler-Hammer WR440300 Residual Current Circuit Breaker

The Eaton Cutler-Hammer WR440300 Residual Current Circuit Breaker is a 40 Amp, four-pole device with a 300 mA residual current rating. It detects leakage by monitoring the balance between all live conductors and neutral, and it trips to interrupt power when the residual current exceeds 300 mA. This characteristic provides residual current protection for circuits where leakage faults must be cleared promptly. The four-pole configuration supports protection of multiple conductors in installations that require shared neutrals or multi-wire circuits, and the WR440300 designation places it within Eaton's WR-series residual current devices. Designed for use in panel-mounted applications, this unit integrates into standard electrical distribution setups that rely on reliable leakage protection to enhance electrical safety. Because it is a four-pole unit, it is suitable for installations where simultaneous disconnection of multiple conductors is required. It is rated for 40 A, aligning with typical branch circuit protection needs, while maintaining a 300 mA sensing threshold. Typical uses include safeguarding electrical installations from leakage faults.