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 fastening assembly is for a circuit breaker. The circuit breaker has a base and a bimetal. The fastening assembly includes a heater element structured to be coupled to the bimetal and the base, and a plurality of fastening members including a nut and a coupling member coupled to the nut. The nut is structured to be disposed between the heater element and the bimetal. The coupling member extends through the heater element and into the nut in order to minimize movement of the heater element with respect to the base.

A bimetal thermal element adapted to assembling into a support. The bimetal thermal element includes: a bimetal strip having a first end and a second end opposite to the first end, and a notch formed at the first end; a heater made of a resistant strip including a linear portion and a wound portion, wherein the linear portion is straight and extending from a first position near the second end of the bimetal strip in a direction parallel to the bimetal strip and the wound portion is wound around the bimetal strip and the linear portion; and an insulating device to insulate the bimetal strip from the heater. With this design, there is also no current within the bimetal strip and its support, so the deflection of the bimetal strip is generated only by the temperature-rise coming from the resistant strip, therefore, it can realize a long tripping time.

Provided is a trip mechanism for DC molded case circuit breaker, in which the insulating distance between the poles increases without any increase in whole product size, thereby reliably providing a trigger output against an over current and a fault current instantaneous breaking required. The trip mechanism includes a trip mechanism part including an instantaneous trip mechanism, the instantaneous trip mechanism including a movable member to operate according to a fault current instantaneous breaking required, and a thermal trip mechanism including a bimetal to operate according to an over current, the trip mechanism part being provided for one of two adjacent poles; a crossbar that is rotatable by contacting and pressing of the movable member of the instantaneous trip mechanism or the bimetal of the thermal trip mechanism; and a shooter that is provided to be rotatable by contacting of the crossbar rotating.

This disclosure relates to a heat sensitive electrical safety device with a manually resettable device and an automatically resettable fuse. The manually settable fuse prolongs the serviceable life of the automatically resettable fuse.

A circuit breaker having a frame comprises a bimetal plate having a longitudinal length wherein the bimetal plate is cut along the longitudinal length into a narrow section and a wider section both being parallel to each other such that the bimetal plate is configured to control when and how a trip mechanism of a trip unit activates. The circuit breaker comprises a heating element coupled to the bimetal plate to heat the narrow section and the wider section when a current goes through the heating element. The narrow section and the wider section of the bimetal plate to deflect differently when a same amount of heat is applied in a same amount of time to control when and how the trip mechanism activates such that to allow to have two different current ratings in the frame in that the bimetal plate allows to increment a current protection level from a lower current rating to a higher current rating.

A circuit breaker having a frame comprises a bimetal plate having a longitudinal length wherein the bimetal plate is cut along the longitudinal length into a narrow section and a wider section both being parallel to each other such that the bimetal plate is configured to control when and how a trip mechanism of a trip unit activates. The circuit breaker comprises a heating element coupled to the bimetal plate to heat the narrow section and the wider section when a current goes through the heating element. The narrow section and the wider section of the bimetal plate to deflect differently when a same amount of heat is applied in a same amount of time to control when and how the trip mechanism activates such that to allow to have two different current ratings in the frame in that the bimetal plate allows to increment a current protection level from a lower current rating to a higher current rating.

A miniature safety switch is used in motor vehicle electronics. The miniature safety switch has a housing base, from which a fixed contact arm and a bimetallic contact arm, which has a moving contact and a bimetallic snap disk attached thereto, are led out. A PTC resistor is brought into direct contact with the bimetallic snap disk by a compression spring and is electrically integrated in such a way that, as a result of the heat generated by the PTC resistor, the bimetallic snap disk remains in the open position thereof in the event of triggering.

A circuit breaker and method for operating a circuit breaker. The circuit breaker includes a first and a second breaker terminal, a bimetal strip, a first conduction line, a switch with a first and a second contact, a triggering device mechanically coupling the bimetal strip to the switch, a magnet and a detection device comprising a magnetic field sensor configured to detect a magnetic field of the magnet. The first conduction line is electrically coupled to the first breaker terminal and to the first contact and is wound around the bimetal strip. The magnet is connected to at least one of the bimetal strip, the triggering device and the switch.

A thermal trip assembly is for an electrical switching apparatus. 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 thermal trip assembly includes a load conductor, a bimetal adapted to cooperate with the operating mechanism to open the separable contacts in response to a trip condition, and a bypass heater element structured to be electrically connected to the shunts. The bypass heater element directs the flow of electric current to at least partially bypass the bimetal.