Circuit breaker 4-pole 10kA/15kA B-50A 4M. Circuit breaker in accordance with DIN EN 60898-1 (VDE 0641-11) with time-delayed thermal release for overload protection and electromagnetic release for short-circuit protection. Suitable for the subsequent installation of additional devices. Labeling option directly on the device and individual removal from the phase busbar assembly by unlocking the quick-release top hat rail fastening.