The present invention provides an arc-extinguishing device, including an arc-extinguishing chamber, where the arc-extinguishing chamber includes a support, a plurality of arc-extinguishing grid sheets, a first gas-evolving hood, and a second gas-evolving hood; the plurality of arc-extinguishing grid sheets are mounted on the supports, the arc-extinguishing grid sheet has a groove to form a moving track for a moving contact, both sides of the groove extend toward the moving contact respectively to form a first extension leg and a second extension leg, an end and an inner side of the first extension leg are wrapped by the first gas-evolving hood, and an end and an inner side of the second extension leg are wrapped by the second gas-evolving hood; a surface of the gas-evolving hood extending along the inner side of the extension leg toward the groove is referred to as a wrapping surface.

A relay includes a movable contact piece having a first movable contact and a second movable contact, a first fixed terminal having a first fixed contact, a second fixed terminal having a second fixed contact, a drive device configured to move the movable contact piece, and the wall portion disposed inside the first fixed contact and the second fixed contact in a longitudinal direction. At least a part of the wall portion is disposed at a position beyond the first fixed contact and the second fixed contact toward the movable contact piece in a moving direction of the movable contact piece. The movable contact piece has a shape so as to avoid the wall portion in a contact state where the first movable contact is in contact with the first fixed contact and the second movable contact is in contact with the second fixed contact.

A process of manufacturing a heat resistant and low carbon plate for a circuit breaker includes preparing a heat resistant and low carbon plate for a circuit breaker; coating the heat resistant and low carbon plate with organic material; coating the organic material with inorganic material; and heating and drying the heat resistant and low carbon plate. The process continuously grips each of heat resistant and low carbon plates conveyed on a conveyor with a coat application device being used for the coating steps. A circuit breaker having the heat resistant and low carbon plate is also provided.

The electrical switch includes two fixed contacts and a rotatable knife contact having a rotational axis and including at least one longitudinal pair of blades flexibly connected to each other. The two fixed contacts as well as the blades in the rotatable knife contact are of a first electrically conductive material composition. The first and the second fixed contact includes a first contact pin and outer ends in the blades in the rotatable knife contact includes a second contact pin. The first contact pin and the second contact pin are of a second electrically material composition, which is different from the first material composition. The first contact pin and the second contact pin pass over each other during a switching event.

Provided herein are protection devices having U-shaped fuse elements. In some embodiments, a protection device may include a housing defining a cavity, and a fuse element within the cavity. The fuse element may include a first component and a second component separated by a barrier, and wherein the first and second components are joined at a fusible bridge.

In an embodiment a switching device includes at least one stationary contact in a switching chamber containing a gas comprising H.sub.2 and one movable contact in the switching chamber, wherein the switching chamber has a switching chamber wall and a switching chamber base, and wherein the switching chamber at least partially comprises a polymer material configured to release hydrogen when heated.

A method and apparatus for a printed circuit board having a substrate, an electrical component disposed on the substrate and connected to an input, a wire bond connecting the electrical component to an output, and a gas-generating fuel disposed on the substrate proximate to the wire bond to account for an arc fault.

A low voltage switch pole including an insulating casing defining an internal space with a contact area and an arc extinguishing area, a fixed contact assembly and a movable contact assembly being position in the contact area, the movable contact assembly being movable between a closed position in which it is into contact with the fixed contact assembly and an open position in which it is spaced apart from the fixed contact assembly, an arc chamber including a plurality of substantially parallel metallic plates being position in the arc extinguishing area, wherein fixed contact assembly is provided with a contact support, a contact surface contacting the movable contact assembly in the closed position and positioned on the contact support, and a conductive expansion plate positioned on the contact support and extending toward the arc chamber, and wherein the fixed contact assembly is provided with a gasifying plate which is directly mounted on the conductive expansion plate.

A circuit interrupter includes a fixed terminal, a movable contactor, a moving mechanism, a squib, and accommodation. The fixed terminal includes a fixed contact. The movable contactor includes a movable contact connected to the fixed contact. The moving mechanism is configured to move the movable contactor from a closed position where the movable contact is connected to the fixed contact to an open position where the movable contact is separated from the fixed contact. The squib is configured to generate gas by combustion. The accommodation is for accommodating the fixed contact and the movable contactor. In the circuit interrupter, the gas is introduced into the accommodation.

An arc chute includes a pair of opposing side walls and a non-magnetic body. The side walls are formed of an electrically insulating material. The non-magnetic body includes an open area and a plurality of slots through which to facilitate gas flow. The arc chute also includes a back wall arranged on a back side of the non-magnetic body and including at least one first insulator and at least one magnet. The at least one first insulator is arranged between the at least one magnet and the open area and configured to electrically isolate the magnet from the non-magnetic body. The magnet is configured to generate a magnetic field to redirect an arc in the open area toward one of the side walls.