A unipolar switching module made of insulating material and including an incorporated thermomagnetic tripping set, and/or a current measurer and power supply set for an electronic controller A multipolar low-voltage molded case circuit breaker can include unipolar switching modules, which interact with the tripping set and/or the current measurer and power supply set.

The invention refers to a circuit breaker (300A) comprising a vacuum interrupter (301) for a gas insulated switchgear. Moreover, the invention refers to a gas insulated switchgear comprising at least one circuit breaker (300A) and/or a disconnector pole. The circuit breaker (300A) has a vacuum interrupter (301) comprising a first movable contact (302), a second stationary contact (303) and a first center axis (304). Moreover, the circuit breaker (300A) comprises a first insulator (305), a contact unit (306) arranged at the first insulator (305), wherein the first movable contact (302) can be moved towards the contact unit (306) so as to be connected to the contact unit (306), an electrical conducting unit (307) comprising a first side (308) and a second side (309), wherein the first side (308) and the second side (309) are opposite to each other, wherein the vacuum interrupter (301) is arranged at the first side (308) of the electrical conducting unit (307), and a second insulator (310) wherein the second insulator (310) is arranged at the second side (309) of the electrical conducting unit (307), wherein the second insulator (310) is connected to the second stationary contact (303), wherein the second insulator (310) has a second center axis (311), and wherein the second center axis (311) of the second insulator (310) is parallel to or collinear with the first center axis (304) of the vacuum interrupter (301).

An electric circuit breaker device includes an igniter provided to a housing, a projectile disposed in a cylindrical space formed in the housing, the projectile being movably formed in the cylindrical space by energy received from the igniter, a conductor piece that is provided to the housing, forms a portion of an electric circuit, includes a cutoff portion to be cut off by the projectile in a portion thereof, and is disposed with the cutoff portion crossing the cylindrical space, an arc-extinguishing region positioned within the cylindrical space, on a side opposite to the projectile prior to actuation of the igniter with the cutoff portion interposed between the arc-extinguishing region and the projectile, and configured to receive the cutoff portion cut off by the projectile, and a coolant material having a fibrous form and disposed in the arc-extinguishing region.

An electric circuit breaker device includes an igniter provided to a housing, a projectile disposed in a cylindrical space formed in the housing, the projectile being movably formed in the cylindrical space by energy received from the igniter, a conductor piece that is provided to the housing, forms a portion of an electric circuit, includes a cutoff portion to be cut off by the projectile in a portion thereof, and is disposed with the cutoff portion crossing the cylindrical space, an arc-extinguishing region positioned within the cylindrical space, on a side opposite to the projectile prior to actuation of the igniter with the cutoff portion interposed between the arc-extinguishing region and the projectile, and configured to receive the cutoff portion cut off by the projectile, and a coolant material having a fibrous form and disposed in the arc-extinguishing region.

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.

Disclosed is a small circuit breaker. The small circuit breaker according to an embodiment of the present invention is provided with an arc guiding portion at a movable contact carrier. Accordingly, an arc generated as a fixed contact and a movable contact are separated from each other can be smoothly discharged to the outside, along the arc guiding portion. Thus, even in a case that an additional arc chamber is not provided, a generated arc can be discharged smoothly. As a result, damage of the fixed contact and the movable contact, which occurs when an arc is positioned near the fixed contact or the movable contact for an excessively-long time, can be prevented.

Disclosed is a small circuit breaker. The small circuit breaker according to an embodiment of the present invention is provided with an arc guiding portion at a movable contact carrier. Accordingly, an arc generated as a fixed contact and a movable contact are separated from each other can be smoothly discharged to the outside, along the arc guiding portion. Thus, even in a case that an additional arc chamber is not provided, a generated arc can be discharged smoothly. As a result, damage of the fixed contact and the movable contact, which occurs when an arc is positioned near the fixed contact or the movable contact for an excessively-long time, can be prevented.

A circuit breaker includes a main protection circuit connected in series with a protected circuit, an auxiliary protection circuit connected in series with the protected circuit, where the main protection circuit is connected in parallel with the auxiliary protection circuit, a mechanical disconnecting device, where the mechanical disconnecting device disconnects the main protection circuit when an over-current occurs in the protected circuit, and a fusing device, where the fusing device is fused after the main protection circuit is disconnected, to disconnect the protected circuit.

A circuit breaker includes a main protection circuit connected in series with a protected circuit, an auxiliary protection circuit connected in series with the protected circuit, where the main protection circuit is connected in parallel with the auxiliary protection circuit, a mechanical disconnecting device, where the mechanical disconnecting device disconnects the main protection circuit when an over-current occurs in the protected circuit, and a fusing device, where the fusing device is fused after the main protection circuit is disconnected, to disconnect the protected circuit.