Provided is a circuit assembly with a novel structure that can quickly reduce heat generation at a connection portion of a heat generating component. A circuit assembly includes a heat generating component that generates heat when energized; a energization member that connects to a connection portion of the heat generating component; a fastening member that fastens the energization member to the connection portion; and a heat capacity increasing component that thermally connects to a fastening site of the energization member and the connection portion and increases a heat capacity of the connection portion of the heat generating component.

A battery distribution unit includes a housing having a bottom mounted to a battery case of a battery module and having a component cavity with a contactor therein. The contactor has fixed contacts having terminating ends extending from a bottom end of a contactor housing. The BDU includes terminals at the bottom end of the contactor coupled to the terminating ends and a heat exchanger cap at the bottom end of the contactor. The heat exchanger cap is provided in the component cavity in thermal communication with the fixed contacts and in thermal communication with the battery case of the battery module to dissipate heat from the fixed contacts into the battery case of the battery module.

A battery distribution unit includes a housing having a bottom mounted to a battery case of a battery module and having a component cavity with a contactor therein. The contactor has fixed contacts having terminating ends extending from a bottom end of a contactor housing. The BDU includes terminals at the bottom end of the contactor coupled to the terminating ends and a heat exchanger cap at the bottom end of the contactor. The heat exchanger cap is provided in the component cavity in thermal communication with the fixed contacts and in thermal communication with the battery case of the battery module to dissipate heat from the fixed contacts into the battery case of the battery module.

An electromagnetic relay includes a base, at least one fixed conductive sheet assembly, at least one movable conductive sheet assembly, at least one arc blow component, an electromagnet and an outer cap. The fixed conductive sheet assembly includes a fixed connecting plate and a fixed contact, and the movable conductive sheet assembly includes a movable connecting plate and a movable contact. The base is made of a thermal conductive polymer, and the fixed connecting plate has a first heat conduction part installed in the base and a second heat conduction part connected to the first heat conduction part and extended to an outer side of the base. The electromagnetic relay further includes at least two thermal conduction components installed in the base and symmetrically configured on both opposite sides of the fixed and movable contacts respectively for dissipating the heat generated by the electromagnetic relay.

A contact mechanism includes: a movable touch piece that includes a caulking portion, a pair of arms forked from the caulking portion and respectively having free ends, first and second movable contacts provided at the respective free ends of the pair of arms, and a coupler configured to couple the free ends of the pair of arms; and first and second fixed contacts disposed respectively facing the first and second movable contacts contactably to or separably from the first and second movable contacts.

A control apparatus includes a processor that determines whether an ice generation condition is satisfied on the basis of at least one or both of a state of a heat source of a vehicle and an outside air temperature after an operation stop of a drive source of the vehicle. If the ice generation condition is satisfied, the processor repeats an ice-crushing operation at a predetermined time interval in a predetermine ice-crushing time period by turning on and thereafter turning off the relay. The predetermined ice-crushing time period is determined on the basis of a temperature difference between a temperature of the fixed contact or the movable contact of the relay and a temperature of an internal atmosphere inside the relay. The predetermined time interval is a time period in which the ice on the fixed contact and the movable contact of the relay grows to a predetermined size.

A switching device is disclosed, in particular a circuit breaker, with a thermal release, on which a moving switching piece is arranged by a contact link support. The moving switching piece is borne on a spring body and is arranged opposite stationary switching pieces. A heat-extraction apparatus composed of a heat-dissipating material is in each case arranged at the side, along the stationary switching pieces.

A switching device is disclosed, in particular a circuit breaker, with a thermal release, on which a moving switching piece is arranged by a contact link support. The moving switching piece is borne on a spring body and is arranged opposite stationary switching pieces. A heat-extraction apparatus composed of a heat-dissipating material is in each case arranged at the side, along the stationary switching pieces.

A circuit breaker arrangement includes a housing, a contact seated in the housing, and a lead in electrical communication with the at least one contact and disposed outside the housing. The circuit breaker arrangement includes a heat sink in thermal communication with the lead to transfer heat between the contact and the lead.

A vacuum interrupter assembly is provided. The vacuum interrupter assembly includes an operating mechanism, a vacuum chamber including a number of bellows assemblies, a conductor assembly including a first contact assembly and a second contact assembly, the first contact assembly including a stem and a contact member, the first contact assembly stem including an elongated body with a proximal first end, a medial portion, and a distal second end. The first contact assembly stem body has a reduced length. The first contact assembly stem body having a reduced length generates less heat and electrical resistance.