A circuit breaker can include a moveable electrical contact configured to be moved between an open position and a closed position, and a lever assembly configured to prevent the progressive closing of the moveable electrical contact to the closed position such that the lever assembly is configured to cause snap action closing of the moveable electrical contact at a charged position of a motorized slider.

Bus mounted surge protection devices are provided that are configured to be positioned in a panelboard alongside one or more similarly sized circuit breaker devices. The bus mounted surge protection device is configured to be received by a same provisional bus as the one or more circuit breaker devices and the bus mounted surge protection device is configured to protect all of the one or more circuit breaker devices in the panelboard.

Provided is a power distribution box distributing commercial electric power supplied from lead-in electric power lines into branch electric power sources and supplying the branch electric power sources to respective loads connected thereto. More particularly, the present invention relates to a power distribution box equipped with a resistive leakage current detector extracting a resistive leakage current simply and accurately from a resultant leakage current and causing leakage current interruption and alarm to be actuated according to the extraction result. The power distribution box equipped with the resistive leakage current detector of the present invention includes: a zero-phase current transformer detecting a resultant leakage current; a voltage detector detecting voltage of branch lines; a power calculator calculating wasted power; a phase difference calculator calculating a phase difference; and a resistive leakage current extractor extracting a resistive leakage current, wherein the power calculator calculates apparent and effective power.

In one example, a hybrid circuit interrupter may include a three-coil architecture, first coil circuitry, leakage detection circuitry, and a main processing circuit including a processor. The three-coil architecture may include a coil housing, three coils, and a plurality of coil assembly conductors. The coils may be disposed within the coil housing. The coils may be parallel and aligned. The coil assembly conductors may be at least partially disposed within the coil housing. The first coil circuitry may be connected to the first coil and may generate first coil signals. The leakage detection circuitry may be connected to the other coils and may generate a leakage signal. The processor may receive the first coil and leakage signals, determine whether an arc fault exists from the first coil signals, determine whether a ground fault exists from the leakage signal, and generate a first trigger signal if a fault is determined.

A single or multiple pole switching device which includes a switch chamber with an arc extinguishing device for each pole, wherein the switch chamber has two lateral walls between which a cage is arranged that is provided for mounting a movable contact bridge, where contacts are arranged on the contact bridge, where the arc extinguishing device has a plurality of quenching plates, the ends of which are accommodated in a pocket arrangement, where the lateral walls have a support for laterally supporting the cage in a direction transverse with respect to the switching direction of the contacts and parallel to the lateral walls, where the pocket arrangement is a separate component from the cage, which pocket arrangement is spaced apart from the cage such that it does not provide such lateral support for the cage, such that a cost-effective and reliable single or multiple pole switching device is provided.

The present invention relates to a transportation device of a withdrawable circuit breaker, and more particularly, to a transportation device of a withdrawable circuit breaker capable of simultaneously moving right and left handles of a girder assembly for restricting movement of the transportation device or releasing a restricted state. The transportation device of a circuit breaker includes: a truck assembly on which a body of the circuit breaker is loadable; a body plate of a girder assembly installed on a front surface of the truck assembly; a pair of sliding plates slidably installed in the body plate; and a rotation plate having both sides to which leg portions of the sliding plates are rotatably coupled, respectively, wherein the rotation plate is inserted into a lead screw penetratingly-formed at a central part of the girder assembly.

A liquid-cooled heat dissipation apparatus includes a base (10), a telesignaling linkage member (20), a sliding plate (30) and a switch module (40). The telesignaling linkage member (20) is moveably installed on the base (10). The sliding plate (30) is installed corresponding to the telesignaling linkage member (20) and generates a movement along with the telesignaling linkage member (20). The switch module (40) includes a microswitch (41) arranged corresponding to the sliding plate (30) such that the microswitch (41) is operably opened or closed based on the movement of the sliding plate (30). Accordingly, through the opening and closing of the microswitch, the telesignaling monitoring on the functional module state can be achieved.

A differential electrical protection device D including N-1 phase conductors, each phase conductor including, between an input, or upper, connection land and an output, or lower, connection land, a portion able to pass through a torus and a portion able to pass through a current measurement and supply sensor, the input connection lands being situated in a first plane P1, and the output connection lands extending in a second plane P2, in that the supply and measurement sensors of the N1 phase conductors are each positioned in the space situated between the two planes P1,P2, and wherein it includes an additional phase conductor including an input connection land and an output connection land, a portion able to pass through the torus and a portion able to pass through an additional measurement sensor only measuring the current, this additional measurement sensor being of small size and being positioned directly above the torus in such a way that the assembly formed by the torus and the additional sensor is situated substantially in the space between the two planes P1,P2.

A circuit breaker having a housing with an accessory cover includes an accessory cover interlock assembly that trips the circuit breaker upon removal of the accessory cover. The accessory cover interlock assembly includes a plunger rotatable from an initial install position to an engaged position that moves a trip lever into a de-energize position (tripping the circuit breaker) upon removal of the accessory cover. The accessory cover interlock assembly prevents the circuit breaker from being reset while the access cover is removed. The accessory cover interlock assembly automatically resets upon re-attachment of the accessory cover to the circuit breaker housing. Methods of forced safety tripping in a circuit breaker are also provided, as are other aspects.

The disclosed invention ensures safe operation of an electrical switchgear by preventing an operator from contacting or interacting with an active circuit breaker. One way this is accomplished is through a locking system that prevents a door to the interior of the switchgear from opening until the circuit breaker is in a disengaged position. A second way this is accomplished is by a manipulation restriction system that prevents the circuit breaker from being manually moved unless the door is closed. Another way this is accomplished is by a circuit breaker decoupler, accessible from the exterior of the switchgear that can directly manipulate the circuit breaker into disengagement.