Residual current circuit breaker 4P 10kA B-40A 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 the subsequent installation of additional equipment. Labeling option directly on the device.