Smart Circuit Breaker

Abstract

This project is to supply single phase home appliances. This project is used for an alternative for MCB. MCB is fault current protective device which trip on fault current which flows in the circuit. MCB are based on the thermal bimetallic trip mechanism which is very slow and tripping time is based upon percentage of overloads MCB having bimetallic trip which gets derated after some mechanical operation and cause unwanted tripping. All the above faults will be overcome by smart circuit breakers which provide all types of protection such as overload, under voltage, high temperature and short circuit protection, this type of protection is necessary because, now days all, appliance such as LCD, Air conditioner, Refrigerator, etc consist of electronic circuitry which is voltage sensitive and get damage at voltage fluctuation. This project also monitors and display fault on LCD and stores the data for further action. Smart circuit breaker is fast acting and sense relay as fast as possible and trips the relay within 100msec. than MCB which takes 1000msec. to 1600msec. In addition to that LM 35 temperature sensor is also interface to microcontroller by if temperature exceed 550C microcontroller will trip the relay. The intention to use temperature sensor is to detect fire hazard in domestic purpose as well as commercial purpose.