Circuit breaker capable of automatically calibrating rated current

Abstract

The invention relates to a circuit breaker capable of automatically calibrating rated current. The circuit breaker is characterized in that secondary output sides of AC current transformers CT1, CT2, CT3, and CTN being separately connected to a signal processing circuit; the signal processing circuit converting the current signals of 4 phase L1, L2, L3 and LN to one 4 phase signal which is connected to one earth wire with respect to a control chip, then the 4 phase signal being connected to the control chip; one end which slightly contacts a button being connected to a positive power supply and the other end which connects to one end of a resistor being connected to the control chip, the other end of the resistor being connected to a ground potential of the system; each pin of the 8 rotation dialing numbers which reads setting states of the current intelligent control system being connected to the control chip in the form of a bus. According to the invention, the circuit breaker achieves automatic calibration of rated current of circuit breakers and accurate protection of electrical appliances as loads by changing the position of the dialing numbers in combination with slight touch of the button, so that the user does not need to change the circuit breaker on the basis of power consumption changes of the load side. The circuit breaker is practical and can achieve better automatic calibration of rated current of circuit breakers.

Description

technical field [0001] The invention belongs to a circuit breaker, in particular to a circuit breaker with the function of automatic calibration of rated current. Background technique [0002] With the wide application of electronic technology in various fields, intelligent circuit breakers have also appeared in the types of circuit breakers, with intelligent functions such as adjustable protection curves and four-stage protection. With the application of intelligent circuit breakers more and more wide, its advantages are becoming more and more obvious. However, the rated current of general intelligent circuit breakers is fixed, or a limited number of fixed values, which are still subject to certain restrictions during use. When the user needs to adjust the rated current of the circuit breaker, he will face the situation that it cannot be adjusted, or there is no corresponding rated value among the limited options, so he can only choose to use a close rated value instead, w...

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