A circuit breaker, in particular of a power breaker, having a busbar which is mounted so as to be movable between a closed position and an open position. The busbar, a trip device and a hand lever are coupled by means of the mechanism in such a way that, when the hand lever is moved from the first position into the second position, the busbar is moved from the open position into the closed position. Upon tripping of the trip device, the busbar is moved from the closed position into the open position, and the hand lever is moved from the second position into the first position if it is not blocked. When the hand lever is moved from the second position into the first position, the busbar is moved from the closed position into the open position regardless of whether the busbar is blocked in the closed position.

A collapsible link device includes a side frame, a carrier, a main contact arm, a plurality of collapsible links, and a release mechanism. The carrier is pivotably coupled to the side frame. The main contact arm is pivotably coupled to the carrier and includes a first end including a first electrical contact. The plurality of collapsible links are pivotably coupled to the side frame and the carrier. The release mechanism is pivotably coupled to at least one of the collapsible links and the carrier. The plurality of collapsible links are movable between an uncollapsed position in which the first electrical contact contacts a second electrical contact and a collapsed position that results from the first electrical contact separating from the second electrical contact.

A collapsible link device includes a side frame, a carrier, a main contact arm, a plurality of collapsible links, and a release mechanism. The carrier is pivotably coupled to the side frame. The main contact arm is pivotably coupled to the carrier and includes a first end including a first electrical contact. The plurality of collapsible links are pivotably coupled to the side frame and the carrier. The release mechanism is pivotably coupled to at least one of the collapsible links and the carrier. The plurality of collapsible links are movable between an uncollapsed position in which the first electrical contact contacts a second electrical contact and a collapsed position that results from the first electrical contact separating from the second electrical contact.

A blocking member for an actuator having a movable arm for effecting a quick-make feature, includes for example, an elongated member having a first end and a second end, and wherein a portion of said elongated member being configured so that said blocking member disposed in a first position engages a portion of the movable arm of the actuator to restrain movement of the movable arm, and so that said blocking member disposed in a second position disengages from the portion of the movable arm of the actuator to permit movement of the movable arm.

An electrical protection device, including a switching mechanism configured to switch between a set configuration and a tripped configuration, and a slide movable between a set position and a disengaged position. The electrical protection device further includes a resetting hook kinematically linked to a switching lever, and the slide supports a slide hook. When the slide is in the disengaged position, the resetting hook and the slide hook are ready to be engaged, and when the slide is in the set position, the slide hook and the resetting hook are spaced apart from each other and resetting of the electrical protection device results in engagement of the slide hook and the resetting hook and in a displacement of the slide.

A latch-free actuator includes, for example, a movable arm, a first biasing element operable to apply a force to move the movable arm in a first direction, and a yieldable support having a rigid configuration defining a generally straight axis and a flexible configuration defining a non-straight axis. The yieldable support is operable in the rigid configuration to support a compression force along the straight axis due to and countering the first biasing element so that the movable arm is prevented from movement in the first direction, and the yieldable support is operable, by applying a tripping force, to the yieldable support to transition the rigid configuration to the flexible configuration to withdraw support of the compression force and allow the movable arm to be moved by the first biasing element in the first direction.

A tripping mechanism for a circuit breaker comprises a connecting rod assembly and a control assembly, wherein one end of the connecting rod assembly is connected with a rotating shaft assembly for driving the circuit breaker to be switched off in a driving manner, and the other end of the connecting rod assembly is provided with a jump pin which can be connected with the control assembly in a latching manner, and the jump pin is also provided with a U-shaped groove. The control assembly comprises a switching-off latch which is rotatably mounted. The end part of the switching-off latch can be connected with the U-shaped groove in a latching and limiting manner, and the circuit breaker triggers the end part of the switching-off latch to be tripped from the U-shaped groove when being switched off, and therefore the rotating shaft assembly connected with the connecting rod assembly drives the circuit breaker to be switched off. The tripping mechanism for the circuit breaker, which is provided by the present invention, is stable in latching, simple in structure and accurate in action.

An energy storage operation mechanism for a circuit breaker comprises a side plate assembly, a connecting rod assembly, a cam assembly, an energy storage assembly, a rotating shaft assembly and a control assembly. A rotatable driving shaft is mounted in the side plate assembly. The connecting rod assembly and the cam assembly are mounted on the driving shaft. The energy storage assembly and the rotating shaft assembly are mounted at one side of the driving shaft, and the control assembly is mounted at the other side of the driving shaft. The connecting rod assembly is connected with the rotating shaft assembly. The cam assembly can be in contact and connection with the energy storage assembly to push the energy storage assembly to store energy. The control assembly can be connected with the connecting rod assembly and the cam assembly in a latching manner. The energy storage operation mechanism for the circuit breaker, which is provided by the present invention, is compact in structure and high in reliability.

A circuit breaker includes, for example, a housing, a stationary electrical contact attached to the housing, a movable arm operably movably attachable to the housing and a second end having an electrical contact releaseably contactable with the stationary electrical contact, and an actuator mechanism. The actuator mechanism includes a first biasing means for opening the electrical contacts, a second biasing means for closing the electrical contacts, and a yieldable support. The yieldable support is operable in a rigid configuration to support a compression force to prevent opening of the electrical contacts while the second biasing means is operable to apply the force to close the electrical contacts. The yieldable support is operable, by applying a tripping force, to transition the rigid configuration to the flexible configuration to withdraw support of the compression force and allow opening of the electrical contacts.

Circuit breakers with handles having at least one handle bearing pin that contacts an upper end portion of a moving arm and allows the arm to rotate to OFF, ON and TRIP positions, typically about 90 degrees of rotation.