Current-limiting type plastic shell circuit breaker mechanism and current-limiting type plastic shell circuit breaker comprising same

Abstract

The invention provides a current-limiting type plastic shell circuit breaker mechanism. The current-limiting type plastic shell circuit breaker mechanism comprises a mechanism support, an upper connecting rod, a lower connecting rod, an upper movable contact, a lower movable contact and a lock catch, and is characterized by further comprising a jump pin assembly, and the jump pin assembly consists of a first jump pin, a second jump pin, a jump pin spring and two jump pin clamp plates; a first jump pin connecting column connected to the mechanism support is arranged at one end of the first jump pin, and a jump pin spring retaining device for retaining the jump pin spring is arranged at the other end of the first jump pin; a part of the first jump pin, a part of the second jump pin, the jump pin spring and the jump pin retaining device are clamped between the two jump pin clamp plates, and the second jump pin is pivotally connected to the jump pin clamp plates; and under non-overload, overload and small-current short circuit states, the second jump pin is connected with the first jump pin to form a rigid body under the action of the jump pin spring and is under a locking state by the lock catch, and under a large-current short circuit state, the second jump pin overcomes the action of the jump pin spring to rotate clockwise relative to the jump pin clamp plates so as to enable the mechanism to trip.

Description

technical field [0001] The invention relates to a current-limiting molded case circuit breaker mechanism and a current-limiting molded case circuit breaker comprising the current-limiting molded case circuit breaker mechanism. Background technique [0002] Molded case circuit breakers are often used in low-voltage power distribution systems to connect and break loads, protect the safety of lines and equipment, and belong to the category of low-voltage electrical appliances. [0003] The short-circuit breaking performance of a current-limiting molded case circuit breaker (MCCB, hereinafter referred to as a circuit breaker) depends on factors such as the opening time of the contacts, the speed of the contact movement, and the performance of the arc extinguishing chamber. In the case of other factors being the same, the faster the contact movement of the circuit breaker, the better its breaking performance. In addition, in today's market where resources are scarce, low-cost ci...

AI Technical Summary

Problems solved by technology

This kind of circuit breaker has excellent short-circuit breaking performance, but the cost is high, such as figure 2 shown

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