In a DC circuit breaker (dz47 electric car-air switch electric motorized circuit breaker manufacturers), the main circuit comprises a lower connecting line for supporting the movable contact, and a contact closing device of an upper connecting row and a surface silver plating is composed of a large pot shaped magnet with a closing coil.

The magnet comprises a moving core, a contact pressure spring and a magnetic core reset spring; all of these components are mounted on the operating rod. The shifting fork unit is installed at the top of the operating rod. The overcurrent tripping device comprises an armature composed of a laminated sheet and a movable magnetic core connected to the operating rod controlled by a spring.

Five pairs of auxiliary contacts are controlled by the contact switch. They are located in the plastic box at the lower part of the closing device. The arc extinguishing chamber comprises an angle plate, a baffle plate and a deionization plate which are arranged between two arc extinguishing plates.

When the circuit breaker is closed due to over current or normal switching command, the propulsion mechanism will drive the movable contact to be divided. The propulsion mechanism also acts on 5 reversing auxiliary contacts.

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