Phoenix Contact Electronic Circuit Breakers. Electronic device circuit breaker CB Series. Compact design with precise nominal current levels Modular expansion possible thanks to the uniform, plug-in housing concept Active current limitation, even when switching capacitive loads N/O contact for remote signaling of the operating state. Multi-channel electronic device circuit breaker CBM Series. With active current limitation for protecting four loads at 24 V DC in the event of overload and short circuit. Precise nominal current levels of 0.5 to 10 A Integrated dynamic current limitation Electronic locking mechanism to increase system safety DIN rail mounting