Residual current circuit breaker 4-pole 10kA 40A 300mA type S selective. Residual current circuit breaker (FI) in accordance with DIN EN 61008-1 (VDE 0664-10), DIN EN 61008-2-1 (VDE 0664-11) with bi-connect terminals at the bottom, external blue test button and residual current display. Suitable for the subsequent installation of additional equipment. Connection terminals with wire insertion protection, labeling option directly on the device.