Abstract
In our Life，electrical accidents caused by the leakage current of electrical equipment often occur from time to time。As a low-voltage electrical appliances, Residual Current Circuit Breaker can be used to prevent leakage of electric shock and personal, so it is very widely used. The core in the residual current circuit breaker control circuit what our computer produce is a chip LM54133.
Now single-chip technology in the MCCB intelligent applications and other products has been made eeply developed ，Single-chip technology ,which achieved good social and economic benefits,will be applied to the residual current circuit breakers to protect its properties can be more reliable and sharp, the realization of multi-function protection.
According to the actual principle of residual current circuit breakers, based on PIC16F877 single chip to control the components, The design is of residual current simulation, each module of the circuit breaker to study the design and production of hardware and software design, to achieve action on the leakage current detection and display.
Keywords：Residual current , Circuit Breaker, Single-chip
