Rapid-releasing breaker

Abstract

The invention discloses a rapid-releasing breaker, comprising a shell, a wiring base, a dual-metal sheet, a contact component, a switch component, and an electromagnetic component which are sequentially provided in the shell. The contact component includes a static contact, a movable contact arm, a releasing member, a locking member and a spring. The switching component includes a rotating handle, a transmission connecting rod and a torsional spring. The transmission connecting rod is matched with the locking member and the releasing member to form the releasing and locking action. The invention further includes a transmission member that is movably arranged between the releasing member and the movable iron core of the electromagnetic component. A head end of the transmission member is rotatably installed in the shell through a pin shaft. The transmission member is provided with a pushing raised head that is matched with transmission member in a pushing way with respect to the head end of the movable iron core. A tail end of the releasing member is provided with a pushing head that is matched with the pushing part in a pushing way. The transmission member is provided with a pushing raised head that is matched with the movable contact arm in a pushing way. The invention has rapid brake separation, fast arc extinction and high safety.

Description

technical field [0001] The invention relates to a low-voltage electrical appliance for over-current protection and short-circuit protection, in particular to a quick-release 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 double gold piece, 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 ro...

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 double gold piece, 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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