The invention relates to a protective device (2) for an electrical circuit (1), including a first fuse (8), a pyroelectric switch (12) connected in parallel with the first fuse and comprising a control area (16), capable of receiving a trigger signal (S), and a power area (18) for the passage of the electric current. The device also comprises a control circuit configured to produce and transmit the trigger signal to the control area. The device includes a second fuse connected in series between a first input conductor (4) and the first fuse and capable of supplying a power supply voltage (V) to the control circuit, which is connected between the second fuse and the control area.

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.

This electrical switching apparatus includes a protection casing, at least one switching member suitable for switching between a first position permitting the passage of a current and a second position preventing the passage of the current, a mechanism for control of the or of each switching member, and at least one auxiliary module disposed in the casing, the auxiliary module being removable with respect to the casing and configured to implement a function associated with the control mechanism. The electrical switching apparatus includes a mechanical referencing member common to the control mechanism and to each auxiliary module, for the positioning of the control mechanism and of each auxiliary module in the casing.

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.

Two electric poles are controlled in one and the same circuit breaker by an undivided opening mechanism controlled by a pyrotechnic actuator. The opening of the circuit that is brought about by this actuator, which is fast for a large opening travel of the mobile contacts, makes it possible to extinguish electric arcs under good conditions. The poles may be placed in series on one and the same electrical circuit in order to reduce the potential difference across the terminals of each of them, thereby further increasing the effectiveness of the circuit breaker in terms of arc extinguishing.

A switching assembly includes an operating assembly and a fixed contact assembly including a first fixed contact, a second fixed contact, a third fixed contact, a fourth fixed contact, and a number of terminals. The number of terminals includes a first terminal, a second terminal, and a third terminal. The switching assembly also includes a movable contact assembly that includes a first movable contact and a second movable contact. The first movable contact is movable between a first position and a second position. The second movable contact is movable between a first position and a second position. The operating assembly is coupled to the movable contact assembly and moves the first and second movable contact assemblies between the first and second positions. The switching assembly also includes a shunt assembly including a number of shunts. The shunt assembly is configured in one of a series configuration or a parallel configuration.

A low-profile electronic circuit breaker includes first and second electrical branches coupled to respective first and second load terminals. The electronic circuit breaker also includes an electronic processing circuit configured to monitor an electrical condition in the first and second electrical branches. The electronic circuit breaker is packaged in a housing sized to occupy a standard single-pole breaker panelboard location. In some embodiments, the electronic circuit breaker has no load neutral terminals associated with the first and second load terminals. Methods of assembling an electronic circuit breaker are provided, as are other system and method aspects.

This electrical switching apparatus includes a protection casing, at least one switching member suitable for switching between a first position permitting the passage of a current and a second position preventing the passage of the current, a mechanism for control of the or of each switching member, and at least one auxiliary module disposed in the casing, the auxiliary module being removable with respect to the casing and configured to implement a function associated with the control mechanism. The electrical switching apparatus includes a mechanical referencing member common to the control mechanism and to each auxiliary module, for the positioning of the control mechanism and of each auxiliary module in the casing.

A load providing test and diagnostic assist device for provision of power to equipment undergoing diagnostic testing and repair includes a breaker that is sized appropriately to the amperage of the equipment under repair. The device includes a power cable and a power cord that are gauged appropriately to the current source supplied to the equipment under repair. The power cable has a first terminus and a second terminus. The power cord has a first end and a second end. The first end and the first terminus are electrically coupled to the breaker. A connector is electrically coupled to the second terminus of the power cable. The connector is couplable to an alternating current source. A coupler is electrically coupled to the second end of the power cord.

Embodiments provide tripping unit of a circuit breaker. The tripping unit includes a magnet, a bimetal member extending alongside of the magnet, and an armature pivotable on the magnet, wherein the armature having an engagement portion engageable with the bimetal member at a moveable end of the bimetal member. Circuit breakers including triggering mechanisms and tripping units are also disclosed, as are low-profile, electronic circuit breakers including a maximum transverse width (Wt) limited to occupy only a single standard breaker panelboard location. System and methods are provided, as are other aspects.