A circuit interrupter for protecting a protected circuit includes separable contacts, an operating mechanism structured to trip open the separable contacts, a current sensor structured to sense a current flowing through the protected circuit, a temperature sensor structured to sense a temperature of the protected circuit proximate the current sensor, and a processor configured to select a trip time based on the sensed current, to adjust the selected trip time based on the sensed temperature, and to cause the operating mechanism to trip open the separable contacts when the adjusted selected trip time is reached.

A current sensing assembly includes a conductor having a first side, a second side opposite the first side, a third side, and a fourth side opposite the third side. The first side has a first notch formed therein and the second side has a second notch formed therein opposite the first notch. The current sensing assembly also includes a sensor assembly including a first magnetic sensor disposed in the first notch or proximate to the third side of the conductor between the first and second notches, and a second magnetic sensor disposed in the second notch or proximate to the fourth side of the conductor between the first and second notches.

An electronic trip unit is for a low-voltage circuit breaker of a three-phase AC circuit. The electronic trip unit includes a housing with a front, rear, left-hand, right-hand, top and bottom face; a controller to compare current measurement values of the three-phase AC circuit with at least one of current limit values, current period limit values and time period limit values and to output a tripping signal, for interrupting the three-phase AC circuit, upon the values being exceeded. The electronic trip unit further includes a receptacle to provide a connection between the electronic trip unit and the module, the module being receivable by the left-hand, right-hand, top or bottom side face of the housing. At least one function of the electronic trip unit is activated upon the module being received. The front face of the housing includes a viewing window. At least a portion of a received module is visible.

A contactor arrangement includes a post, a fastener and a temperature sensor. The post defines a post axis. The fastener is fixed to the post along the post axis. The temperature sensor is in thermal communication with the contactor conductor and post through the fastener and is electrically insulated from the post for monitoring resistive heat generation in a contactor fixed to the post by the fastener.

A switch is disclosed, in particular a power switch, for low voltages. The switch includes mechanically separable contact elements, in abutment when the switch is closed and via which a current to be monitored flows through the switch, an electronic trigger unit, which triggers a respective contact mechanics unit if a current condition is satisfied. In the event of triggering, the contacts are separated and the switch is switched on via the contact mechanics unit. A supply unit is included to extract a first electric energy from the current flowing through the switch to supply the trigger unit with energy. To guarantee energy supply even when switching to a short-circuit, the contact mechanics unit is coupled to a conversion unit, which converts a portion of the mechanical energy to be provided during switching-on into a second electric energy that supplies the trigger unit with electric energy during switching-on.

The present invention relates to a circuit breaker (20, 40) comprising a handle (33) connected to a switching and trip mechanism (25) in the base unit (20a), and capable of opening and closing a system (24) of electrical contacts in normal operation, ensuring the interchangeability between a pluggable electronic trip module (20b) and/or a pluggable thermomagnetic trip module (20b), using the same structural base unit (20a). The device comprises a main electric circuit 1 and a secondary circuit 2 or 2b, wherein the main circuit 1, using a current transformer (29) in the base unit (20a) which converts a current flowing in the main circuit 1 of the power line (23) to power the secondary circuit 2 or 2b, issues a trip command to protect the main circuit 1, opening the contact system (24) when predefined current limits are exceeded.

A protective circuit breaker includes a switch housing; connection pieces; a switching contact arranged in the switch housing and connected to the connection pieces; a converter housing including a first passage opening and inserted into a recess in the switch housing and through which the second connection piece runs; a converter coil being arranged around the passage opening/the second connection piece; a plate-like converter cover including a second passage opening through which the second connection piece extends. In order to permit a simple voltage tap, in an embodiment the converter cover has arranged on it: a first contact bearing against the second connection piece at the converter cover, a second contact electrically connected to the first connection piece, and a third contact connected to the first or a second electronics system. An electrical connection is included, via which the third contact is selectively connectable to the first or second contact.

A testing system may include a printed-circuit board coil embedded on a printed circuit board. The testing system may further include a test circuit electrically connected to the printed-circuit board coil, the test circuit configured to: receive a signal from the printed-circuit board coil, analyze the signal from the printed-circuit board coil, and determine a fault based on the signal from the printed circuit board coil.

A circuit breaker includes a circuit breaker main body unit having a main circuit unit forming a circuit line of each phase, a current transformer part having a coil disposed in the circuit line of each phase and a pair of terminals extending from both ends of the coil and selectively connected to an external power source unit, and a safety switching part configured to connect the pair of terminals such that the pair of terminals are not opened, when the power source unit and the pair of terminals are separated.

A contactor arrangement includes a post, a fastener and a temperature sensor. The post defines a post axis. The fastener is fixed to the post along the post axis. The temperature sensor is in thermal communication with the contactor conductor and post through the fastener and is electrically insulated from the post for monitoring resistive heat generation in a contactor fixed to the post by the fastener.