Solid-state circuit breaker

A solid-state circuit breaker, comprising an electronic switch and a mechanical switch connected in series, wherein the mechanical switch comprises:

• a housing;
• a handle, rotatably installed to the housing and rotatable between an on position and an off position;
• a movable contact and a stationary contact, the movable contact is configured to be movable between an open position and a closed position, in the open position, the movable contact is not in contact with the stationary contact, and in a closed position, the movable contact is in contact with the stationary contact;
• a movable contact bracket, the movable contact is installed on the movable contact bracket;
• a transmission assembly, being capable of transmitting a motion of the handle to the movable contact bracket to drive the movable contact to achieve contact and separation with the stationary contact;
• a handle micro-switch, installed to the housing and configured to be actuated upon the handle rotating to the on position and released upon the handle leaving the on position, so that the handle micro-switch is in an on state of the handle micro-switch upon the handle being in the on position and the handle micro-switch is in an off state of the handle micro-switch upon the handle leaving the on position;
• a contact micro-switch, installed to the housing and configured to be actuated by the moveable contact bracket upon the movable contact moving to a closed position and released upon the movable contact leaving the closed position, so that the contact micro-switch directly measures a position of the moveable contact independently of a position of the handle, and so that the contact micro-switch is in an on state of the contact micro-switch upon the movable contact being in the closed position and the contact micro-switch is in an off state of the contact micro-switch upon the movable contact leaving the closed position,
• wherein, by detecting a corresponding state of the handle micro-switch and a state of the contact micro-switch, it is achieved that, upon the solid-state circuit breaker being switched from off to on, the mechanical switch is turned on first, and then the electronic switch is turned on;
• and
• upon the solid-state circuit breaker being switched from on to off, the electronic switch is turned off first, and then the mechanical switch is turned off.