Undervoltage release device which is attached a

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 protection accessories (also known as attachment) with MCB body assembled together in  air circuit breaker  to increase the MCB, expanded scope of use. Undervoltage release is attached devices one of them. In this paper, suitable for use with MCB assembled  Electric transformer  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.