Thermal type adjustable tripping device for miniature circuit breaker

Abstract

The invention discloses a thermal type adjustable tripping device for a miniature circuit breaker. The thermal type adjustable tripping device is mounted in a base of the miniature circuit breaker and comprises a base, a tripping mechanism, a thermal deformation element and an adjusting mechanism. The tripping mechanism is provided with an extended tripping connecting rod. The thermal deformation element is arranged close to the tripping connecting rod. A gap is reserved between the thermal deformation element and the tripping connecting rod. The adjusting mechanism is used for adjusting the distance between the tripping connecting rod and the thermal deformation element. The current in a loop which the miniature circuit breaker is connected into makes the thermal deformation element heated and deform, and the deformed thermal deformation element moves towards the tripping connecting rod, makes contact with the tripping connecting rod, pushes the tripping connecting rod and triggers the tripping connecting rod to trip. The adjusting mechanism is used for adjusting the distance between the tripping connecting rod and the thermal deformation element so as to adjust the magnitude of the setting current in the loop. According to the thermal type adjustable tripping device, the distance between the tripping connecting rod and the thermal deformation element is adjusted through a rigid piece, and it can be guaranteed that the distance between the thermal deformation element and the tripping connecting rod is fixed during operation each time. The thermal type adjustable tripping device is applicable to motors.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, and more specifically, to a tripping device in a circuit breaker. Background technique [0002] The circuit breaker is the main protection switch in the low-voltage distribution network, which provides overload and short-circuit protection for the line. In order to expand the application range of the circuit breaker, according to the magnitude of the overload current or the protection characteristics of the electrical equipment, it is necessary to have the function of adjusting the setting current of the circuit breaker. Especially when providing protection for motors, in order to adapt to the selection of motors with different powers, a certain current adjustment range is required, and the value in the middle area of ​​the set current range should be selected as much as possible according to the rated current value of the motor. [0003] At present, the molded case circuit break...

AI Technical Summary

Problems solved by technology

The structure of the adjustment device in this scheme is complicated, and there are many parts, which greatly increases the difficulty of production, and the cooperation brought by many parts will reduce the adjustment accuracy and reliability of the adjustment mechanism.

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