A circuit breaker having a circuit operating device according to one embodiment of the present invention includes a circuit unit having a main circuit, a detecting unit having a detection circuit for detecting a fault current in the main circuit, and a circuit operating device configured to allow connection or isolation between the main circuit and the detection circuit, wherein the circuit operating device includes a first fixed unit and a second fixed unit connected to the main circuit and the detection circuit, respectively, and arranged in parallel to each other, and a moving unit rotatably coupled between the first fixed unit and the second fixed unit to connect or isolate the main circuit and the detection circuit to or from each other.

The present invention relates to a multi-pole molded case circuit breaker, more particularly, to a multi-pole molded case circuit breaker having a safety device (with an isolation function) which prevents a manipulation handle from being moved to an off-position when a fusion occurs on a contact part.

A circuit breaker includes an electrically insulative case and a handle rotatably coupled to the electrically insulative case. The circuit breaker also includes a gear train mechanism. The gear train mechanism includes a drive gear drivingly coupled to the handle and a plurality of pinions engaged with the drive gear. The drive gear is arranged to rotate the plurality of pinions in response to a rotation of the handle. The gear train mechanism also includes a rack engaged with the plurality of pinions. The rack is arranged to translate in response to a rotation of the plurality of pinions.

A plug-in circuit breaker that includes a circuit breaker housing with a limiting hole and a opening and closing button. The circuit breaker further includes a locking member rotatably arranged inside the circuit breaker housing with an upper portion close to the limiting hole provided with a locking protrusion fitting. A lower portion of the circuit breaker housing is provided with a locking driving surface fitting with the opening and closing button. When the limiting hole is not shielded, the opening and closing button jacks up the locking driving surface to enable the locking protrusion to extend out of the limiting hole. The plug-in circuit breaker is closed when the limiting hole is shielded, so that the locking protrusion cannot extend out of the limiting hole. The locking driving surface limits the opening and closing button, so that the opening and closing button cannot press to the destined position.

A circuit interrupter having a status indicator providing a current status of the circuit interrupter, the status indicator presenting one of: an On state, an Off state or a Fault state. The status indication is provided as a visual status and is color coded to one of the three circuit interrupter states. The circuit interrupter further including, in one configuration, a rocker actuator that rotates about an axis and the status indication mechanism is coupled to the rocker actuator.

The invention disclosed is a circuit breaker 2, comprising a case 3 that houses circuit breaker components 16, 20, 22. The case has a handle opening 7 for an operating handle 4 to project through the handle opening. The handle opening has a viewing cut-out 6 formed on a side of the handle opening. An operating handle 4 is pivotally 10 mounted inside the case, with an outer portion 17 extending through the handle opening in the case. The operating handle is operatively coupled to a contact operating mechanism 20 and a current-responsive tripping mechanism 22 in the case. An indicator 8 is positioned on a side 9 of the operating handle. The indicator is visible through the viewing cut-out when the operating handle has been moved to a central position (FIG. 3C) in the handle opening, in response to a trip event in the circuit breaker.

An electrically insulative case includes a door arranged to move between an opened position and a closed position and a rack mechanism arranged to move between an ON position and an OFF position. The electrically insulative case further includes an interlock including a plunger arranged to move between a locked position and an unlocked position. The interlock also includes an engagement mechanism that is coupled to the plunger. The engagement mechanism is arranged to move between a first position in which the engagement mechanism is spaced from the rack mechanism and a second position in which the engagement mechanism is engaged with the rack mechanism. The door is inhibited from moving to the opened position when the plunger is in the locked position. The plunger is arranged to move to the locked position when the engagement mechanism is in the second position and the rack mechanism is in the ON position.

A direct-current (DC) air circuit breaker for opening and closing a circuit according to various embodiments includes a circuit unit having a main circuit, a detecting unit having a detection circuit for detecting a fault current in the main circuit, and a circuit operating device configured to allow connection or isolation between the main circuit and the detection circuit.

The present invention relates to a multi-pole molded case circuit breaker, more particularly, to a multi-pole molded case circuit breaker having a safety device (with an isolation function) which prevents a manipulation handle from being moved to an off-position when a fusion occurs on a contact portion.

Examples described herein relate to circuit breaker assemblies with changeable orientation. In one example, an apparatus includes a circuit breaker assembly and a circuit breaker housing to receive the circuit breaker assembly. The circuit breaker assembly includes a circuit breaker including a contact, a cover plate attached to a surface of the circuit breaker, and a handle movable between a first position and a second position. The circuit breaker assembly is removably attachable to the circuit breaker housing to change an orientation of the circuit breaker assembly.