A contactor assembly post is provided. The contactor assembly post includes a first portion electrically connected to an external bus bar at an exterior of an electrical contactor housing, a second portion electrically connected to an internal bus bar at the exterior of the electrical contactor housing, a third portion and fins. The internal bus bar is configured to extend into an interior of the electrical contactor housing to be electrically coupled to another internal bus bar. The third portion extends transversely between the first and second portions. The fins extend transversely from multiple points defined along a longitudinal axis of the third portion.

A contactor assembly post is provided. The contactor assembly post includes a first portion electrically connected to an external bus bar at an exterior of an electrical contactor housing, a second portion electrically connected to an internal bus bar at the exterior of the electrical contactor housing, a third portion and fins. The internal bus bar is configured to extend into an interior of the electrical contactor housing to be electrically coupled to another internal bus bar. The third portion extends transversely between the first and second portions. The fins extend transversely from multiple points defined along a longitudinal axis of the third portion.

A relay unit includes: bus bars serving as conductive paths; relays including contact portions for turning on and off energization of the bus bars, and a plurality of terminals connected to the contact portions, the bus bars being fixed to the terminals; and heat dissipation members that are fixed to the terminals of the relays, receive heat of the terminals, and dissipate the heat.

A relay unit includes: bus bars serving as conductive paths; relays including contact portions for turning on and off energization of the bus bars, and a plurality of terminals connected to the contact portions, the bus bars being fixed to the terminals; and heat dissipation members that are fixed to the terminals of the relays, receive heat of the terminals, and dissipate the heat.

An electronic control device includes a relay including a relay case and an electromagnet and a contact part. The relay case is structured to contain the electromagnet and the contact part. The contact part is structured to be opened and closed by action of the electromagnet. A connector terminal is electrically connected to the relay. A circuit board is structured to mount the relay and the connector terminal thereon. An exterior shell is structured to contain the circuit board such that the connector terminal is exposed outside the exterior shell. A thermal mass element is disposed in a wiring route between the relay and the connector terminal.

An electronic control device includes a relay including a relay case and an electromagnet and a contact part. The relay case is structured to contain the electromagnet and the contact part. The contact part is structured to be opened and closed by action of the electromagnet. A connector terminal is electrically connected to the relay. A circuit board is structured to mount the relay and the connector terminal thereon. An exterior shell is structured to contain the circuit board such that the connector terminal is exposed outside the exterior shell. A thermal mass element is disposed in a wiring route between the relay and the connector terminal.

A relay movable spring capable of reducing temperature rise comprising movable contacts, a movable spring sheet and a movable spring lead-out sheet. The movable spring sheet has an opposite first end and second end. The first end is connected to the movable spring leading-out sheet; the movable spring sheet comprises at least two current-carrying conductors; at least two movable contacts are provided, which are fixed to the at least two current-carrying conductors respectively, and which are close to the second end of the movable spring sheet, so that the movable spring sheet forms at least two parallel structures; and a connecting sheet is also mounted on the movable spring sheet, the connecting sheet connecting the at least two movable contacts.

A relay movable spring capable of reducing temperature rise comprising movable contacts, a movable spring sheet and a movable spring lead-out sheet. The movable spring sheet has an opposite first end and second end. The first end is connected to the movable spring leading-out sheet; the movable spring sheet comprises at least two current-carrying conductors; at least two movable contacts are provided, which are fixed to the at least two current-carrying conductors respectively, and which are close to the second end of the movable spring sheet, so that the movable spring sheet forms at least two parallel structures; and a connecting sheet is also mounted on the movable spring sheet, the connecting sheet connecting the at least two movable contacts.

A system including a vehicle having a motive electrical power path; a power distribution unit including a current protection circuit disposed in the motive electrical power path, the current protection circuit including a breaker/relay, the breaker/relay including: a fixed contact, a moveable contact, and a physical opening response portion responsive to a current value; 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 an analog hardware filter having a cutoff frequency selected in response to a frequency of the injected current.

An electrical unit includes a contactor having a housing member, a first terminal, a second terminal, and/or a contact member disposed in the housing member and configured to selectively electrically connect the first terminal and the second terminal. The electrical unit may include a cooling member connected to the housing member, a first bus bar connected to the cooling member and the first terminal, and/or a second bus bar connected to the cooling member and the second terminal. The cooling member may be configured to dissipate heat that is generated via electrical current flowing through the contact member.