Residual current circuit breaker 4P 10kA B-20A 300mA Type A. Residual current circuit breaker according to DIN EN 61009-1 (VDE 0664-20) with 4-pole circuit breaker for 400 V three-phase circuits and a residual current protection circuit in a compact housing, blue test button and residual current display. Easy individual removal from the phase busbar system. Suitable for subsequent installation of additional equipment. Labeling option directly on the device.