A quick trip circuit breaker

Abstract

The invention discloses a quick-release circuit breaker, which comprises a casing and a wiring seat, a bimetal sheet, a contact assembly, a switch assembly, and an electromagnetic assembly sequentially arranged therein. The contact assembly includes a static contact, a moving contact Arm, release piece, lock piece and spring, the switch assembly includes a rotating handle, a transmission link and a torsion spring, and the transmission link is linked with the lock piece and the release piece to form a trip lock action. It also includes a transmission part, which is movably arranged between the tripping part and the moving iron core of the electromagnetic assembly, and the head end of the transmission part is rotatably mounted on the housing through a pin shaft, and the transmission part corresponds to the moving iron core. The head end of the iron core is provided with a push top that cooperates with the push top, and the tail end of the release part is provided with a push head that cooperates with the push top push, and the transmission part is provided with a movable contact arm. Push-to-fit push-off tabs. The invention has the advantages of fast opening, fast arc extinguishing, good safety and the like.

Description

Technical field [0001] The invention relates to a low-voltage electrical appliance with over-current protection and short-circuit protection, in particular to a quick trip circuit breaker Background technique [0002] At present, the main structure of a circuit breaker used for overcurrent or short circuit protection of low-voltage lines is as follows: a terminal block, a bimetallic sheet, a contact assembly, a switch assembly, an electromagnetic assembly, and a circuit breaker between the bimetallic sheet and the electromagnetic assembly are sequentially arranged in the housing. There is also an arc extinguishing cover between the contact ends. The contact assembly includes a static contact, a movable contact, a tripping piece, a locking piece and a spring. The switch assembly includes a rotating handle, a transmission connecting rod and a torsion spring. And the transmission connecting rod cooperates with the locking member and the tripping member to form a tripping and locking...

AI Technical Summary

Problems solved by technology

[0002] At present, the main structure of a circuit breaker used for overcurrent or short circuit protection of low-voltage lines is as follows: a terminal block, a bimetal, a contact assembly, a switch assembly, an electromagnetic There is also an arc extinguishing cover between the contact ends. The contact assembly includes a static contact, a moving contact, a release piece, a lock piece, and a spring. The switch assembly includes a rotating handle, a transmission link, and a torsion spring. And the transmission link cooperates with the lock piece and the trip piece to form a trip lock action. When an overcurrent or short circuit occurs in a circuit breaker with this traditional structure, the head end of the moving iron core pushes the trip piece to rotate. The rotation of the tripping part makes the trip between the transmission link and the locking part, so that the moving contact and the static contact linked with the locking part are opened, but the circuit breaker of this structure, because the moving contact and the static contact The opening of the switch requires the force of the moving iron core to be transmitted to the static contact after the tripping piece and the lock piece. The force transmission stroke is long, and the opening speed is not fast enough, so that the arc is not easy to extinguish instantly, and it is easy to burn out the circuit breaker. shell and contacts, and the opening speed is slow, the instantaneous current in the circuit breaker is too large, which makes the circuit breaker have a safety hazard of explosion

In addition, the circuit breaker with this structure closes again under the action of the contact pressure spring after the moving contact is repelled by the electric repulsion force, the opening performance is not good enough, and it is easy to cause accident hazards

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