Building electrical distribution equipment is widely used in the terminal

With the mini circuit (hereinafter referred to as MCB) in the terminal building electrical distribution equipment widely used. Now with some of the electrical auxiliary devices and  circuit breakers  accessories (also known as attachment) with MCB body assembled together in order to increase the MCB, expanded scope of use. Undervoltage release is attached devices one of them. In this paper, suitable for use with MCB  Circuit breaker undervoltage release applications and design issues elaborated, introduces a voltage auxiliary circuit. An undervoltage release features undervoltage release is a protective accessory; at its terminal voltage drops below a specified range.