A low voltage circuit breaker

Abstract

The invention discloses a low-voltage circuit breaker. The low-voltage circuit breaker comprises a shell, a contract system which is connected with a circuit, a tripping mechanism which drives the contact system to break the circuit and an arc-extinguishing device which conducts arc extinguishing on the contact system, the tripping mechanism comprises a circuit module which detects circuit faults and an operation module which drives the contact system to break the circuit, the operation module comprises an electromagnetic component and an action component, the electromagnetic component is connected with the circuit module in a coupled mode, and when the circuit breaker is tripped, the circuit module drives the electromagnetic component to drive the action system to make the contact system break the circuit. According to the low-voltage circuit breaker, by means of the arrangement of the circuit module, the circuit faults can be effectively detected; by means of the the arrangement of the electromagnetic component and the action component, when the circuit module detects the circuit faults, the electromagnetic component and the action component can effectively drive the contact system to break the circuit, and the influences of the environment and the temperature do not exist.

Description

technical field [0001] The invention relates to a low-voltage electrical appliance, more specifically to a low-voltage circuit breaker. Background technique [0002] The low-voltage circuit breaker is a commonly used power distribution appliance, which is widely used in various electric power projects. It is responsible for power distribution and protection in the low-voltage power distribution system. Its operational performance is crucial to the security and stability of the power grid. When a fault occurs in the system, the circuit breaker quickly cuts off the faulty component in the system, or cuts off the entire power supply, so as to prevent the fault from expanding and avoid huge economic losses and casualties. [0003] The structure of the existing low-voltage circuit breaker includes contacts, tripping components and arc extinguishing devices. During the operation of the circuit breaker, the tripping components are used to drive the contacts to disconnect to realiz...

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Problems solved by technology

[0003] The structure of the existing low-voltage circuit breaker includes contacts, tripping components and arc extinguishing devices. During the operation of the circuit breaker, the tripping components are used to drive the contacts to disconnect to realize disconnection of the circuit, while the arc extinguishing device is timely. The arc generated when the contact is disconnected can be well disconnected to avoid greater loss of the circuit. However, the existing trip assembly structure includes a detection assembly and an operation assembly, wherein the detection assembly is The bimetal sheet and the current coil electromagnet, when the circuit is overloaded, the bimetal sheet will heat up and deform. The head disconnects the circuit to avoid greater loss of the circuit, but because the working principle of the bimetal is realized by temperature, it is greatly affected by the ambient temperature in the actual use process, so in the use process, It is easy to cause greater losses in the circuit caused by the failure of the circuit breaker to act in time

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