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Miniature Circuit Breaker(MCB) Protection Of Power Supply Lines, Power Equipment
Oct 23, 2017

In modern life, Miniature Circuit Breaker(MCB) is a pivotal circuit device, and is one of the most important safety devices in commercial and home circuits. Once the current flow in the house wiring is too large, this simple circuit device will cut off the power supply until the fault is eliminated. Since the reform and opening up, China's household appliances industry has developed rapidly, increasing production and variety, and has greatly met and enriched the vast consumer demand. The circuit breaker has been widely used in low-voltage power distribution system at all levels of feed line, a variety of mechanical equipment,Miniature Circuit Breaker(MCB) power control and terminal control and protection in the side everywhere visible. With the development of the needs of various industries, circuit breaker in the process of being used, because users do not understand the technical parameters, resulting in the use of electrical appliances should not be due to power outages or the unnecessary disconnection of electrical equipment, reducing the reliability of power supply, resulting in a certain economic losses.

As a kind of switch apparatus not only can connect and break the normal load current and overload current, but also can connect and break short-circuit current. Although there are many kinds of circuit breakers, the basic structure and working principle are basically the same. The driving force of the disconnect contact is very important when the double metal plate is used as a circuit breaker with overload current. When the overload current occurs in the circuit, when the bimetal sheet heats up to a certain degree, it will push the traction lever, causing the transmission of the operating mechanism and the contact head to disconnect. When the short circuit instantaneous current, the current reaches the rated current dozens of times times, then the circuit breaker electromagnetic tripping device will move quickly, pushing the traction rod, causing the operation mechanism of the transmission, contact disconnect. In the life of the Miniature Circuit Breaker(MCB) to take off, basically rely on the bimetal sheet heating bending to promote the circuit breaker off.

Miniature Circuit Breaker(MCB) in commercial, household normal use process, due to the use of large electrical equipment at the same time, resulting in the circuit breaker load end of the actual operating current is greater than the selected circuit breaker rated current, and in the continuous use of multiple hours, the resulting load current will be a few times the rated current, will make the circuit breaker off the buckle.

These characteristics can be in the Low-voltage power supply line in the event of overload or short circuit failures, in the power supply line to protect the circuit breaker will act, so that the circuit is cut off to protect the power supply line, power equipment not due to overload or short-circuit, such as failure to burn.