Miniature Circuit Breaker (MCB) is an electro-magnetic device designed to cut off the circuit when an overcurrent occurs. This MCB system is essential in many fields that involved with electric and commonly found in industry, it will protect the electric component in the circuit from short circuit. The Internet of Things (IoT) technology is a new profound technology which will lead to a better and easy lifestyle world. One of the benefits of IoT system is the worker can monitor their work from home. With this new and promising technology, most of the work can be done at home by using mobile phone or a computer. As the title of the project presented, the project developed a microcontroller to monitor the MCB using the technology of the Blynk as the IoT platform. The system will send a message to the user to inform about the trips through a mobile phone by the Blynk application. At the same time, the alternating current (AC) of the MCB is record and graph at the mobile application.
