The present invention relates to an air circuit breaker, in which a recess is formed on one side or each of both sides of each contact plate provided in an insulating cage so as to reduce a contact area between a movable contactor and the contact plate when the movable contactor and the contact plate are brought into contact with each other, thereby preventing a contact portion between the movable contactor and the contact plate from being melted due to heat generation.

The present invention relates to an air circuit breaker, in which a recess is formed on one side or each of both sides of each contact plate provided in an insulating cage so as to reduce a contact area between a movable contactor and the contact plate when the movable contactor and the contact plate are brought into contact with each other, thereby preventing a contact portion between the movable contactor and the contact plate from being melted due to heat generation.

The present disclosure provides controllers for power distribution network circuit interrupting devices and provides electronic control circuits for inclusion in such controllers. The electronic control circuit has a boost circuit, a capacitor storage unit and a pulse width modulator control circuit. The boost circuit boosts an input voltage to a value to supply sufficient energy to a protective relay solenoid to energize the solenoid. The capacitor storage unit stores the boosted voltage from the boost circuit. The pulse width modulator control circuit is responsive to a control and enable circuit to selectively enable energy from the capacitor to energize the one or more protective relays in power distribution system circuit interrupting device.

The present disclosure provides controllers for power distribution network circuit interrupting devices and provides electronic control circuits for inclusion in such controllers. The electronic control circuit has a boost circuit, a capacitor storage unit and a pulse width modulator control circuit. The boost circuit boosts an input voltage to a value to supply sufficient energy to a protective relay solenoid to energize the solenoid. The capacitor storage unit stores the boosted voltage from the boost circuit. The pulse width modulator control circuit is responsive to a control and enable circuit to selectively enable energy from the capacitor to energize the one or more protective relays in power distribution system circuit interrupting device.

The present invention relates to an air circuit breaker, in which a recess is formed on one side or each of both sides of each contact plate provided in an insulating cage so as to reduce a contact area between a movable contactor and the contact plate when the movable contactor and the contact plate are brought into contact with each other, thereby preventing a contact portion between the movable contactor and the contact plate from being melted due to heat generation.

An electrically insulating housing including a mechanical interface, the mechanical interface configured to mechanically connect the electrical connector to or disconnect the electrical connector from a bushing of an external device; an electrical system including: an electrical conductor; and a switching apparatus in an interior of the insulating housing; and a control system configured to control current flow in the electrical conductor by controlling a state of the switching apparatus.

A high voltage relay device according to the present invention includes fixed contacts, a movable contact provided at one side of the fixed contacts and contactable with or separated from the fixed contacts, fixed-side arc electrodes coupled to the fixed contacts, and a movable-side arc electrode coupled to one side of the movable contact and contactable with or separated from the fixed-side arc electrodes when the movable contact is brought into contact with or separated from the fixed contacts, whereby a generation of arc from primary electrodes when current flows and is cut off can be prevented so as to enhance reliability of the primary electrodes, and also usage of specialized materials may result in reduction of material costs.

A fast circuit cutoff device includes a housing, an igniter, a piston, at least one arc extinguishing component and a conductor, the igniter, the piston and the at least one arc extinguishing component are provided in the housing, the conductor penetrates through the housing, the igniter and the piston are located on a first side of the conductor, and the at least one arc extinguishing component is provided on a second side of the conductor; the igniter is configured to drive the piston to move towards the arc extinguishing component to a blocking state, so as to cut a part of the conductor into fragments by the piston; and under the blocking state, ends of the fragments are inserted into the at least one arc extinguishing component under a compression of the piston.

A fast circuit cutoff device includes a housing, an igniter, a piston, at least one arc extinguishing component and a conductor, the igniter, the piston and the at least one arc extinguishing component are provided in the housing, the conductor penetrates through the housing, the igniter and the piston are located on a first side of the conductor, and the at least one arc extinguishing component is provided on a second side of the conductor; the igniter is configured to drive the piston to move towards the arc extinguishing component to a blocking state, so as to cut a part of the conductor into fragments by the piston; and under the blocking state, ends of the fragments are inserted into the at least one arc extinguishing component under a compression of the piston.

Disclosed is an air circuit breaker. The air circuit breaker according to an embodiment of the present disclosure includes a CT magnet unit. The CT magnet unit is provided in the air circuit breaker to cover a movable contact point exposed to the outside. A CT magnet is provided inside a case that forms the outer shape of the CT magnet unit. The CT magnet independently forms a sub magnetic field or forms a main magnetic field together with an extinguishing magnet provided in an arc extinguishing unit. Due to the magnetic field formed by the CT magnet, an arc that is generated receives the application of an electromagnetic force directed toward the arc extinguishing unit. Accordingly, the generated arc can be quickly moved and extinguished.