This relay unit includes: a first bus bar; a relay electrically connected to the first bus bar; and an apparatus cover for covering the first bus bar and the relay. The apparatus cover includes: an upper member in a box shape having a covered upper end, the upper member having an opening formed in a lower end; and a lower member bonded to the upper member such that the opening of the upper member is covered with the lower member. The lower member is formed of a resin having heat conductivity that is higher than that of the upper member. The first bus bar is connected to the lower member via a first inner heat conductive sheet such that heat can be transferred to the lower member, said first inner heat conductive sheet being disposed between the first bus bar and the lower member.

An energized parts guard is disclosed comprising a panel of substantially rigid, electrically insulative material wherein the substantially rigid panel further comprises a first one or more apertures and a second one or more apertures. The first one or more apertures are so dimensioned to accept one or more circuit breakers inserted into the first one or more apertures such that there is less than a 12.5 mm gap between the panel and the circuit breaker on at least two sides of the one or more circuit breakers. The second one or more apertures are positioned to facilitate access to at least one terminal of each of the one or more circuit breakers when the one or more circuit breakers are inserted into the first one or more apertures.

Provided is an electrical connection box including a housing casing for housing a relay, and a heat transfer sheet for transferring heat from the relay to the housing casing, the electrical connection box including: a bus bar provided between a top surface and an inside surface that correspond to each other in the housing casing so as to oppose the top surface and the inside surface; a first holding portion protruding from the inside surface and holding the bus bar via the heat transfer sheet; and a second holding portion protruding from the top surface and holding the bus bar.

A switch with an integrated overcurrent protection element can include multiple arc gap between the contacts when opening the circuit during overload protection and switching operations. The switch can include an overcurrent protection element which can make contact with two contact terminals, and which can change to a different shape upon exposure to an overcurrent condition. The overcurrent protection element can also be moved in a direction normal to the two contact terminals between a first position and a second position through the use of a rotary switch to selectively place the overcurrent protection element in contact with the two contact terminals.

A plastic retaining pin for being inserted through a retaining hole in a high voltage insulating cover has a compressible nose, with the wide part of the nose being larger than the retaining hole. The pin may be on the order of 3-12 inches long. The other end of the pin has a grasping ring for receiving the hook of a hot stick. Along the length of the body of the pin is a plurality of radial portions (e.g., six or more) extending outward from a centerline of the body. These radial portions may be skirts or ribs having a diameter less than the retaining hole in the cover. The skirts or ribs greatly increase the surface leakage distance along the body of the pin and also prevent conductive liquids flowing along the body, which may lead to a flashover.

A circuit breaker, and method of assembling the circuit breaker, includes a circuit breaker housing defining an interior portion, and which includes a molded base and a separable cover. The molded base includes an interior surface and an exterior surface. The exterior surface of the molded base is operatively disposed outside of the interior portion of the circuit breaker housing, and the exterior surface of the base defines at least one current sensing unit receiving cavity configured to receive a current sensing unit therein. The molded base and separable cover are cooperatively disposed to surround the interior portion of the circuit breaker housing.

The present disclosure relates to finger-safe requirements for breaker modules from electrical panel boards and envisages a finger safe cover 100a for a terminal of an electrical switching device 50. The finger safe cover comprises a cover body 110a with an expandable aperture section 120a. The aperture section 120a has an annulus 122a having a primary aperture 124a and a coupling section 126a surrounding the annulus 122a. The primary aperture 124a allows a thinner conducting cable 52 to pass therethrough. The coupling section 126a couples the annulus 122a with the cover body 110a. The aperture section 120a defines a secondary aperture 128a when the annulus 122a is detached from the cover body 110a by breaking the coupling section 126a, to allow to pass therethrough a thicker conducting cable 54. The cover 100a passes the IPXXB test, eliminates the need of safety accessories and is easy to install.

The present disclosure relates to finger-safe requirements for breaker modules from electrical panel boards and envisages a finger safe cover 100a for a terminal of an electrical switching device 50. The finger safe cover comprises a cover body 110a with an expandable aperture section 120a. The aperture section 120a has an annulus 122a having a primary aperture 124a and a coupling section 126a surrounding the annulus 122a. The primary aperture 124a allows a thinner conducting cable 52 to pass therethrough. The coupling section 126a couples the annulus 122a with the cover body 110a. The aperture section 120a defines a secondary aperture 128a when the annulus 122a is detached from the cover body 110a by breaking the coupling section 126a, to allow to pass therethrough a thicker conducting cable 54. The cover 100a passes the IPXXB test, eliminates the need of safety accessories and is easy to install.

A push button switch includes a housing made up of a base and a cover, a first plunger mounted on the cover so as to be pushed down, a movable contacting piece configured to be driven by a push-down operation on the first plunger, a movable contact provided in the movable contacting piece, and a fixed contact disposed so as to come into and out of contact with the movable contact. Specifically, the movable contacting piece includes a movable contact piece provided with the movable contact, and an operation tongue piece disposed on at least one side of the movable contact piece and coupled with the movable contact piece so as to rotate integrally. The operation tongue piece is operated by the operation body of the first plunger to bring the movable contact into and out of contact with the fixed contact.

A disconnector for photovoltaic applications having at least two modular contact boxes, each contact box having a box-like body coupled to a contiguous box-like body of a contiguous modular contact box. The box-like body forms a central seat that accommodates a rotatable contact and two peripheral seats, each of which accommodates a connection portion of a corresponding fixed contact that can be accessed from the outside of the modular contact box. The rotatable contact is able to rotate about the axis of the central seat with respect to the box-like body in order to engage the fixed contacts arranged with their connection portion in the peripheral seats or to disengage from the fixed contacts.