CONSTRUCTION OF 240V AC POWER OVERLOAD MONITOR WITH FIRE AND SMOKE ALARM SYSTEM

An AC overload monitor is a device connected between an AC power source and an AC load to detect and prevent overloading the output from the power source. An overload or short circuit causes fire in any electrical installation. So, it should be avoided. Addition to a circuit breaker, an overload monitor protects a system’s electrical installation in the event of circuit breaker failure. A current transformer is used as the current sensing unit. An Arduino based AVR microcontroller is used to process the input signal from the current transformer and give digital signal output to activate or deactivate a relay connecting the load to the source through the current transformer. In addition the overload monitor, there is a fire and smoke sensor which senses smoke. When an overload or smoke is detected, the load is automatically disconnected from the source.