Working principle of motor circuit breaker – The consistency of the action of the minimum set current value affects the pass rate

The working principle of the motor circuit breaker is: By adjusting knob to set the setting current value, when the motor circuit breaker setting current value of the current value is beyond a certain multiples, the bimetallic strip will be heated bending, the excessive lead guide to mobile level, guide to promote secondary double gold, auxiliary double gold rotation, will be used to lock the jump button lock away, and for closing and reserve elastic potential energy of the jump button to unlock, Therefore, the elastic potential energy can be released to disconnect the static and dynamic contacts and realize the function of breaking the circuit.

In batch production, in order to ensure production efficiency and qualified rate, it is necessary to study and design a set of debugging methods and equipment that can minimize product errors, and each product is tested with the same method and equipment.

At present, most factories in the industry use three-phase synchronous machine to adjust the main double gold of the motor circuit breaker. Its purpose is to debug the main double gold of each product to the same position from the reference wall, so as to ensure the consistency of action of each product. In theory, if the distance between the double gold of each product and the reference wall is consistent, the same current will be used in the same time, and the tripping distance between the double gold bending amplitude and the jump action caused by the tripping distance is equal

For motor circuit breakers of small specifications, the Angle difference of grade 0.1~0.16A is about 200°. Since the minimum setting current scale value of 2# is already at 200°, the scale value of the maximum setting current of this kind of products will be 400° > 360°, so the maximum setting current cannot be verified. 3# is a reasonable minimum setting current scale position.

The action consistency of the minimum setting current value directly affects the production efficiency and qualified rate of the product. In products of the same specification, if the minimum setting current scale is uneven, the appearance quality is also affected.