A state of a tripping solenoid in a circuit breaker is determined by a primary coil and a secondary coil wound around a hollow body of a solenoid. The secondary coil is positioned within magnetic coupling distance from the primary coil and is configured to produce a sensing voltage based on the primary coil voltage. A ferromagnetic plunger positioned in the hollow body, is configured to slide axially to a tripped position to trip the circuit breaker when a trip voltage is applied to the primary coil. A plunger position detecting circuit connected to the secondary coil, is configured to detect the position of the plunger in the hollow body of the solenoid based on the sensing voltage. A reduction or absence of the sensing voltage indicates a faulty or broken connection in the primary coil.

A contactor is provided in the present utility model, the contactor comprising: a housing; a static iron core, a movable iron core, and a contact holder positioned in the housing, wherein the static iron core is fixed to the housing, the movable iron core and the static iron core are disposed opposite to each other, and the contact holder is fixed to the movable iron core; and a built-in switch positioned in the housing, wherein the built-in switch comprises a static contact piece fixed to the housing and a moving contact piece fixed to the contact holder, and the contact holder is configured to drive the moving contact piece to move so as to switch an on/off state of the built-in switch. The contactor of the present utility model has high expandability and improves the convenience of connecting to an external circuit module.

A contactor is provided in the present utility model, the contactor comprising: a housing; a static iron core, a movable iron core, and a contact holder positioned in the housing, wherein the static iron core is fixed to the housing, the movable iron core and the static iron core are disposed opposite to each other, and the contact holder is fixed to the movable iron core; and a built-in switch positioned in the housing, wherein the built-in switch comprises a static contact piece fixed to the housing and a moving contact piece fixed to the contact holder, and the contact holder is configured to drive the moving contact piece to move so as to switch an on/off state of the built-in switch. The contactor of the present utility model has high expandability and improves the convenience of connecting to an external circuit module.

The subject matter discloses a relay, including a housing, static contact bridges, a moving contact bridge, a pushing mechanism and a detection assembly. The static contact bridges is arranged on the housing, the moving contact bridge is movably arranged in the housing between a conduction position where the moving contact bridge is conducted with the static contact bridges and a disconnection position where the moving contact bridge is disconnected from the static contact bridges, and the pushing mechanism is connected with the moving contact bridge and used for pushing the moving contact bridge to move between the conduction position and the disconnection position; the detection assembly comprises an auxiliary moving contact bridge and an auxiliary static contact bridge, the auxiliary moving contact bridge is connected with the pushing mechanism, the auxiliary static contact bridge is arranged on the housing, the auxiliary moving contact bridge is connected with the auxiliary static contact bridge when the moving contact bridge is at the conduction position, and the auxiliary moving contact bridge is disconnected from the auxiliary static contact bridge when the moving contact bridge is at the disconnection position.

The subject matter discloses a relay, including a housing, static contact bridges, a moving contact bridge, a pushing mechanism and a detection assembly. The static contact bridges is arranged on the housing, the moving contact bridge is movably arranged in the housing between a conduction position where the moving contact bridge is conducted with the static contact bridges and a disconnection position where the moving contact bridge is disconnected from the static contact bridges, and the pushing mechanism is connected with the moving contact bridge and used for pushing the moving contact bridge to move between the conduction position and the disconnection position; the detection assembly comprises an auxiliary moving contact bridge and an auxiliary static contact bridge, the auxiliary moving contact bridge is connected with the pushing mechanism, the auxiliary static contact bridge is arranged on the housing, the auxiliary moving contact bridge is connected with the auxiliary static contact bridge when the moving contact bridge is at the conduction position, and the auxiliary moving contact bridge is disconnected from the auxiliary static contact bridge when the moving contact bridge is at the disconnection position.

Testable sealed and/or self-diagnosing electromagnetic or solid-state relays simplify troubleshooting of electrical circuits. The testable relay comprises a relay housing with terminals adapted to connect to a circuit and an opposing top wall with testable terminals formed as projections being flush with or extending from the top wall and being exposed for testing the relay by applying a multimeter device. A self-diagnosing relay comprises a relay housing with terminals adapted to connect to a circuit, and at least two light-emitting diodes (LEDs). One of the LED indicates the relay is energized, and another LED light is a diagnostic LED and indicates if the relay is damaged.

Testable sealed and/or self-diagnosing electromagnetic or solid-state relays simplify troubleshooting of electrical circuits. The testable relay comprises a relay housing with terminals adapted to connect to a circuit and an opposing top wall with testable terminals formed as projections being flush with or extending from the top wall and being exposed for testing the relay by applying a multimeter device. A self-diagnosing relay comprises a relay housing with terminals adapted to connect to a circuit, and at least two light-emitting diodes (LEDs). One of the LED indicates the relay is energized, and another LED light is a diagnostic LED and indicates if the relay is damaged.

A relay with an intermediate alert mechanism and a method for producing an intermediate alert in association with a relay. The relay comprises an input sampling module configured to detect a parameter of a source to be monitored; a processing module configured to determine a working range based on a threshold level and a working condition, and the processing module further configured to automatically determine at least one intermediate level within the working range based on the threshold level. The processing module causes the transmission of an intermediate trigger signal when the detected value of the parameter reaches the intermediate level.

Testable sealed and/or self-diagnosing electromagnetic or solid-state relays simplify troubleshooting of electrical circuits. The testable relay comprises a relay housing with terminals adapted to connect to a circuit and an opposing top wall with testable terminals formed as projections being flush with or extending from the top wall and being exposed for testing the relay by applying a multimeter device. A self-diagnosing relay comprises a relay housing with terminals adapted to connect to a circuit, and at least two light-emitting diodes (LEDs). One of the LED indicates the relay is energized, and another LED light is a diagnostic LED and indicates if the relay is damaged.

Testable sealed and/or self-diagnosing electromagnetic or solid-state relays simplify troubleshooting of electrical circuits. The testable relay comprises a relay housing with terminals adapted to connect to a circuit and an opposing top wall with testable terminals formed as projections being flush with or extending from the top wall and being exposed for testing the relay by applying a multimeter device. A self-diagnosing relay comprises a relay housing with terminals adapted to connect to a circuit, and at least two light-emitting diodes (LEDs). One of the LED indicates the relay is energized, and another LED light is a diagnostic LED and indicates if the relay is damaged.