The PFIM-100/4/003-A with RCD breaker by Eaton is a four-pole, 100 Amp rated, 400 Volt rated circuit breaker. It features a Resistance-Capacitance-Diode (RCD) element, which combination of resistors, capacitors, and diodes help protect the circuit, reduce nuisance tripping, reduce inrush current, maintain rejection, and restrict contact bounce. The breaker is rated for a maximum surge current of 250 Amps and a nominal current of 30 milliAmps. It also includes ratings for power failure, frequency, short circuit protection, and a temperature-compensated thermal disconnect.