One embodiment describes a method that includes determining, using a control circuitry, temperature of a switching device before a make operation by applying a measurement current to an operating coil of the switching device, wherein the measurement current is insufficient to make the switching device; and determining voltage at the operating coil when the measurement current is applied, in which the voltage at the operating coil is directly related to the temperature. The method further includes determining, using the control circuitry, when to apply a pull-in current to the operating coil to close the switching device based at least in part on the voltage at the operating coil, such that the switching device makes at a desired time.

A protection module is for a modular ground fault protective relay. The modular ground fault protective relay includes a power supply module having a connection port. The protection module includes a body having a first side and a second side disposed opposite the first side, a module connector extending outwardly from the first side, the module connector being structured to be removably coupled to the connection port of the power supply module, and a module expansion port extending inwardly from the second side toward the first side.

A fault state indication device for a circuit breaker, comprising a contact group, a transmission assembly and an indication assembly which are mounted inside a housing. The contact group implements a normally open contact group and a normally closed contact group. The transmission assembly acts on a contact support (107), different open and closed states of the contact group are realized via the contact support. The indication assembly indicates a fault state, the indication assembly is linked with the circuit breaker, and carries out a corresponding state indication in response to a fault. The fault state indication device for a circuit breaker has a simple and reliable structure, a manufacturing process which is easier to implement. The fault state indication device can not only indicate the state and type of a load line failure, but also judge an operation state of the circuit breaker via the contact group.

The present invention relates to a molded-case circuit breaker for direct current (DC), and more particularly, to a molded-case circuit breaker for DC in which a connecting conductor for connecting terminals in the DC circuit breaker is configured as an assembly unit and contained in a terminal receiving portion to improve insulation performance and assemblability and reduce occupied space. There is provided a molded-case circuit breaker for DC that contains a plurality of interruption units, the DC circuit breaker including a terminal connecting unit that connects terminals of adjacent interruption units, the terminal connecting unit being placed within a terminal receiving portion on the front or rear of an outer casing of the circuit breaker.

A switching device having a housing, with a cover that can pivot about a rotational axis, and a securing device for carrier rail mounting. The cover has at least one coupling contact for an electrical and/or signal-type contact connection with at least one engageable switching device. A closing or releasing of the contact connection occurs with a pivoting of the cover. A locking or unlocking of the securing device occurs with a pivoting of the cover. The securing device has a spring-elastic clipping element shaped on the housing, for force-locking securing to a carrier rail end face, and has a sliding element, which is mounted such that it can slide in a linear manner within the housing and is coupled to the cover, for interlocking securing to the carrier rail end face opposite the clipping element.

One embodiment describes an interlock for an electromechanical switching system, which includes a housing; a first camming lockout member disposed in the housing and that contacts an auxiliary operator of a first electromechanical switching device; a second camming lockout member disposed in the housing and that contacts an auxiliary operator of a second electromechanical switching device, which the first camming lockout members contacts the second camming lockout member when the first camming lockout member is moved to an actuated position by the first electromechanical switching device to prevent movement of the second camming lockout member to an actuated position.

The present invention relates to a molded-case circuit breaker for direct current (DC), and more particularly, to a molded-case circuit breaker for DC that contains an internal connecting conductor connecting adjacent terminals to improve insulation performance and assemblability and reduce occupied space. There is provided a molded-case circuit breaker for DC that contains a plurality of interruption units within an outer casing, the DC circuit breaker including a two-unit connecting heater that connects fixed contacts of adjacent interruption units, the two-unit connecting heater being placed within the outer casing.

A shunt tab assembly is for an electrical switching apparatus, such as a circuit breaker. The electrical switching apparatus includes a housing, separable contacts enclosed by the housing, an operating mechanism for opening and closing the separable contacts, and a number of shunts. The operating mechanism includes a trip unit. The shunt tab assembly includes a shunt tab structured to be electrically connected to the shunts, a biasing element structured to bias the shunt tab toward a predetermined position with respect to the housing, and a fastener structured to mechanically couple and electrically connect the trip unit to the shunt tab.

A power distributor having a plurality of power distribution modules arranged in a row, for directly mounting on a carrier rail, having a supply module arranged on one end face and a signal module arranged on the opposite end face, and having at least one connection module arranged therebetween. The supply module has a supply connection for a main power line for tapping off a supply power. The connection module is fitted or can be fitted with a protective switch that can be actuated and a plurality of load connections for connecting to an interruptible load circuit by means of the protective switch. The signal module has a first signal connection for a switch signal actuating the protective switch, and the power distribution modules are or can be coupled to each other in an electrically conductive manner.

An assembly device is disclosed for fixing a molded case circuit breaker, including a housing with at least one screw hole for a fixation screw for fixing the molded case circuit breaker to a bus bar. The assembly device includes a screw head holding device for holding a screw head of the fixation screw, the assembly device being configured to be arranged inside a cavity of the housing of the molded case circuit breaker in such a way that a screw head of a fixation screw arranged at the screw hole for mounting the molded case circuit breaker to the bus bar is engageable with the screw head holding device in an engagement direction. Furthermore, a circuit breaker system is disclosed including a molded case circuit breaker and an assembly device. Moreover, a method is disclosed for mounting a molded case circuit breaker to a bus bar.