CIRCUIT BREAKER AND POWER SUPPLY SYSTEM

A circuit breaker and a power supply system are provided, to improve switching performance of the circuit breaker. The circuit breaker includes a mechanical switch circuit, and the mechanical switch circuit includes a busbar, a power module, and a drive module. The power module includes a movable contact and a stationary contact. The stationary contact is electrically connected to the busbar, the movable contact is movable, when the movable contact is connected to the stationary contact, the mechanical switch circuit is conducted, and when the movable contact is disconnected from the stationary contact, the mechanical switch circuit is disconnected. The drive module includes a switch circuit, a movable coil, and a stationary coil. The movable coil and the stationary coil are disposed adjacently, the switch circuit is configured to control a current direction of the movable coil and a current direction of the stationary coil, and the movable coil and the stationary coil attract or repel each other based on whether the current directions are the same, to enable the movable coil to drive the movable contact to be connected to or disconnected from the stationary contact.