A miniature circuit breaker

Abstract

The invention discloses a micro breaker. The micro breaker comprises a first movable contact, a first fixed contact, a second movable contact, a second fixed contact, a drop-out mechanism and the like. Screwing tool holes allowing a screwing tool to stretch in for conducting wire connection are formed in a shell, at least one terminal cover is provided, and the terminal covers are arranged between a first output terminal and the corresponding screwing tool hole and a second output terminal and the corresponding screwing tool hole. When the first movable contact and the first fixed contact are connected with the second movable contact and the second fixed contact, the screwing tool holes corresponding to the first output terminal and the second output terminal are shielded. A locking assembly is arranged between the drop-out mechanism and the second movable contact. Under the effect of external force, the locking assembly triggers the drop-out mechanism and the second movable contact sequentially to enable the first movable contact to be disconnected with the second movable contact and the second fixed contact to be disconnected with the second movable contact sequentially, and meanwhile, enable the terminal covers to no longer shield the screwing tool holes under the driving of the locking assembly. The micro breaker can guarantee that wire connecting personnel can conduct wire connecting safely under the condition that the inner parts of the breaker are completely disconnected, and the situation that the wire connecting personnel conduct hot-line work due to negligence can be well avoided.

Description

technical field [0001] The invention belongs to the field of electrical technology, in particular to a miniature circuit breaker. Background technique [0002] The miniature circuit breaker is the most widely used terminal protection device in the building electrical terminal power distribution device. It is used for single-phase and three-phase short-circuit, overload, overvoltage and other protections below 125A, including single-pole 1P, two-pole 2P, three-pole 3P, and four-pole 4P. [0003] The miniature circuit breaker is composed of operating mechanism, contacts, protection devices (various releases), arc extinguishing system and so on. Its main contact is closed manually or electrically. After the main contact is closed, the free tripping mechanism locks the main contact in the closing position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release i...

AI Technical Summary

Problems solved by technology

However, in the circuit breaker of this patent document, the screwdriver hole communicating with the output terminal is always open, and it is easy for the wiring personnel to extend the screwdriver into the screwdriver hole when the contacts in the circuit breaker are not disconnected. Misoperation of wiring the output terminals, which may lead to electric shock accidents for wiring personnel

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