Monitoring unit for monitoring a circuit breaker comprising an electrical power supply management system and circuit breaker comprising such a unit

Monitoring unit for monitoring a circuit breaker comprising an electrical power supply management system and circuit breaker comprising such a unit This monitoring unit (1) for monitoring a circuit breaker comprises: - a safety module (22); - programmable computation modules (40, 41, 42, 43, 44); - an electrical power supply management system (4) configured to switch, according to the level of electrical power received from electrical power supply sources (10, 11, 12, 13) and according to a predefined power supply program, between: - an active power supply mode, in which the safety module (22) and at least a portion of the computation modules (40, 41, 42, 43, 44) are supplied with power, and - a safety power supply mode, in which the safety module (22) is supplied with power and the computation modules (40, 41, 42, 44) are not supplied with power. C;V