An electromagnetic relay according to an aspect of the present disclosure includes a housing including a base part on which an electromagnetic relay main body is mounted, and a cover part covering the electromagnetic relay main body, in which the housing is in a sealed state when a pressure inside the housing is equal to or lower than a predetermined pressure, in which when the pressure inside the housing is equal to or lower than the predetermined pressure, the cover part and the base part are butted against each other, and the electromagnetic relay includes a connection passage connecting an abutment part between the cover part and the base part to outside of the electromagnetic relay.

An electromagnetic relay according to an aspect of the present disclosure includes a housing including a base part on which an electromagnetic relay main body is mounted, and a cover part covering the electromagnetic relay main body, in which the housing is in a sealed state when a pressure inside the housing is equal to or lower than a predetermined pressure, in which when the pressure inside the housing is equal to or lower than the predetermined pressure, the cover part and the base part are butted against each other, and the electromagnetic relay includes a connection passage connecting an abutment part between the cover part and the base part to outside of the electromagnetic relay.

A system including a vehicle having a motive electrical power path; a power distribution unit including a current protection circuit comprising a breaker/relay including: a fixed contact; a movable contact; a physical opening response portion responsive to a current value in the motive power circuit; a current source circuit electrically coupled to the breaker/relay and structured to inject a current across the fixed contact; and a voltage determination circuit electrically coupled to the breaker/relay and structured to determine at least one of an injected voltage amount and a contactor impedance value, wherein the voltage determination circuit comprises a high pass filter having a cutoff frequency selected in response to a frequency of the injected current.

A mobile application includes a motive power circuit, the motive power circuit including a power storage device and an electrical load, where the power storage device and the electrical load are selectively electrically coupled through a power bus; a power distribution unit (PDU) electrically interposed between the power storage device and the electrical load, where the PDU comprises a breaker/relay positioned on one of a high side and a low side of the power storage device; wherein the breaker/relay includes a fixed contact electrically coupled to the power bus, a moveable contact selectively electrically coupled to the fixed contact, an armature operationally coupled to the moveable contact, and a biasing member biasing the armature.

A mobile application including a motive power circuit including a power storage device and an electrical load, where the power storage device and the electrical load are selectively electrically coupled through a power bus; a power distribution unit (PDU) electrically interposed between the power storage device and the electrical load, wherein the PDU comprises a breaker/relay including: a fixed contact electrically coupled to the power bus; a movable contact selectively electrically coupled to the fixed contact; an armature operationally coupled to the movable contact; a first biasing member biasing the armature; a contact force spring operationally interposed between the armature and the movable contact; and a means for adjusting an opening velocity of the moveable contact during a run-time operation of the power bus, wherein the opening velocity comprises an initial velocity of the moveable contact away from the fixed contact in response to a physical opening response.

An electromagnetic relay deicing system includes an electromagnetic relay that includes a common terminal, a normally open terminal, and a normally closed terminal and that supplies electric power from an electric power supplier to an electrical apparatus when the common terminal and the normally open terminal are connected, and a control circuit that controls an on-state and an off-state of the electromagnetic relay. During the on-state of the electromagnetic relay, the common terminal and the normally open terminal are connected by a movable piece. During the off-state of the electromagnetic relay, the common terminal and the normally closed terminal are connected by the movable piece. The control circuit deices the electromagnetic relay by causing, during the off-state of the electromagnetic relay, electric conduction between the common terminal and the normally closed terminal connected by the movable piece so that ice on a surface of the normally open terminal melts.

An electromagnetic relay deicing system includes an electromagnetic relay that includes a common terminal, a normally open terminal, and a normally closed terminal and that supplies electric power from an electric power supplier to an electrical apparatus when the common terminal and the normally open terminal are connected, and a control circuit that controls an on-state and an off-state of the electromagnetic relay. During the on-state of the electromagnetic relay, the common terminal and the normally open terminal are connected by a movable piece. During the off-state of the electromagnetic relay, the common terminal and the normally closed terminal are connected by the movable piece. The control circuit deices the electromagnetic relay by causing, during the off-state of the electromagnetic relay, electric conduction between the common terminal and the normally closed terminal connected by the movable piece so that ice on a surface of the normally open terminal melts.

An electrical contact switch device includes: a fixed contact; a movable contact configured to come into contact with and move away from the fixed contact; a casing configured to house the movable contact and the fixed contact inside, and the casing includes at least one micro opening whose opening area is 80 m.sup.2 or less on an outer surface facing an outside.

An electrical contact switch device includes: a fixed contact; a movable contact configured to come into contact with and move away from the fixed contact; a casing configured to house the movable contact and the fixed contact inside, and the casing includes at least one micro opening whose opening area is 80 m.sup.2 or less on an outer surface facing an outside.

Provided is a power relay assembly. The power relay assembly comprises: a support plate having at least one electrical element mounted on one surface thereof and including a plastic material having a heat dissipation property and insulation property; at least one bus bar electrically connected to the electrical element; and an electromagnetic wave shielding unit for shielding electromagnetic waves generated from the electrical element.