Compliant electrical circuit protection devices are described for use in hazardous environments without presenting ignition risks for potentially explosive environmental conditions. Sensing features and systems may evaluate wiring limits and user selected settings for compatibility, detect loose connections and operating parameters to ensure safe operation of the device, and to intelligently diagnose and manage issues of concern for the circuit protection devices as well as the larger electrical power system.

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 system including an arc flash sensor that detects an arc flash event and an arc flash mitigation device in communication with the sensor. The mitigation device includes a path of least resistance having a path input and a path output. The arc flash sensor is located downstream the output. The mitigation device includes an electro-mechanical switch between the input and the output and an actuator. The mitigation device also includes a bypass power switch device that includes a solid-state circuit interrupter and that conduct current between the input and the output in response to an open-circuit condition of the switch. A system controller is provided to generate a trigger to activate the actuator to generate the open-circuit condition of the switch, which causes the power switch device to interrupt a fault current associated with a fault event in response to detection of the arc flash event.

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 switch assembly is configured to be mounted to a lower cover of the junction box assembly. The switch assembly includes a holder, the holder is configured to removably coupled to the lower cover. The holder includes a pocket. The switch assembly further includes a switch. The hook is configured to engage the lower cover and is dimensioned to be seated within the pocket of the holder. The switch includes a hook. The hook is configured to pull the switch towards the lower cover so as to pinch the holder between the lower cover and the switch. Accordingly, the hook presses the switch against a bottom surface of the lower cover so as to eliminate a rattle when the switch is held in suspension beneath the lower cover of the junction box assembly.

A switch assembly is configured to be mounted to a lower cover of the junction box assembly. The switch assembly includes a holder, the holder is configured to removably coupled to the lower cover. The holder includes a pocket. The switch assembly further includes a switch. The hook is configured to engage the lower cover and is dimensioned to be seated within the pocket of the holder. The switch includes a hook. The hook is configured to pull the switch towards the lower cover so as to pinch the holder between the lower cover and the switch. Accordingly, the hook presses the switch against a bottom surface of the lower cover so as to eliminate a rattle when the switch is held in suspension beneath the lower cover of the junction box assembly.

A panelboard assembly for a harsh and/or hazardous environment is provided. The panelboard assembly includes a core assembly. The core assembly includes a main breaker assembly configured to be electrically connected to a power supply, and a branch breaker assembly electrically connected to the main breaker assembly and configured to be electrically connected to one or more loads, and a power distribution heatsink assembly. The power distribution heatsink assembly includes an electrically-conductive heatsink having a first end and an opposing second end, the first end electrically connected to the core assembly and an electrically-nonconductive isolator electrically insulating the heatsink.

A solid state switching device, such as a solid state circuit breaker, includes at least one heat sink, a control electronics printed circuit board (PCB), and power electronics. The power electronics are useful to regulate the flow of current from one terminal of the solid state switching device to another terminal. The power electronics can include one or more solid state devices such as FETs, Thyristors, Thyristors+SiC JFET in parallel, IGBTs, and IGCTs. The control PCB can include a variety of circuit elements useful to perform the function of a gate driver useful to activate the solid state device of the power electronics. The heat sink includes one or more signal vias formed therethrough to permit nesting of the control PCB within the heat sink.

A solid state switching device, such as a solid state circuit breaker, includes at least one heat sink, a control electronics printed circuit board (PCB), and power electronics. The power electronics are useful to regulate the flow of current from one terminal of the solid state switching device to another terminal. The power electronics can include one or more solid state devices such as FETs, Thyristors, Thyristors+SiC JFET in parallel, IGBTs, and IGCTs. The control PCB can include a variety of circuit elements useful to perform the function of a gate driver useful to activate the solid state device of the power electronics. The heat sink includes one or more signal vias formed therethrough to permit nesting of the control PCB within the heat sink.

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.