The working principle of DC circuit breaker: a supporting contact the lower part of the connecting bar comprises a main loop, an upper connection row and silver plated contact closing device is composed of a with closing coil of large tank like magnet.
The magnet contains a movable core, contact pressure spring and a magnetic core reset spring; all of these components are mounted on the operating lever. The fork unit is mounted at the top of the operating lever.
Overcurrent tripping device contains a armature consisting of laminated sheet, a connected to the operation of the controlled by the spring rod on the movable magnetic core, due to the role of the rod can set the trip setting value. Five the auxiliary contact is controlled by the movable contact.
The plastic box are located in the lower part of the closing device.
The arc extinguishing chamber comprises an angle plate, a baffle plate and a de ionized plate, and the above is arranged between the two pieces of the arc board.
When the circuit breaker is due to the flow or normal of the sub gate command and the sub gate, the propulsion mechanism will drive the movable contact points. The propulsion mechanism also acts on the 5 reversing auxiliary contacts.