Circuit breaker Structure and working principle

The working principle of the circuit breaker is that when a short circuit occurs, a magnetic field will be generated by a large current to overcome the reaction force spring, and the trip unit pulls the operation mechanism to operate, and the switch instantaneously trips. When overloaded, the current increases and the heat is increased. The bimetal deforms to a certain degree and pushes the mechanism. The greater the current, the shorter the operating time. The electronic type circuit breaker uses sensor to collect the current of each phase. Compared with the set value, when the current is abnormal, the microprocessor sends a signal, so that the electronic trip unit drives the operating mechanism to act.

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Circuit Breaker Features

1,The use of funnel type combination terminal block makes the connection simple and reliable; it can be easily connected to the busbar; and the terminal capacity for incoming or outgoing line can reach 35mm2 through the additional connection terminal.

2, The contact system uses silver alloy material (silver tined or silver graphite), truly no welding.

3,The rapid arc extinguishing system is composed of moving contact locking pieces, arc-guiding plates, magnetic blowing metal plates and metal arc extinguishing grid plates. There are up to 13 metal grids in the arc chamber, which can quickly extinguish the arc. The average short-circuit breaking time is only 0.0037 seconds.

4,The energy limit level is higher than 3 (energy value is only 50% of level 3).

5, By good selective protection and good protection, it can be with the superior fuses, molded case circuit breakers and other products to form a good selective protection.

6,The circuit breakers can meet the standards of IEC898 and the breaking capacity can be up to 10KA (if by industrial IEC947-2 standard, it can be up to 25KA)

7, Circuit breaker tripping characteristics is of A, B, C, D; the rated current ranges from 0.3-125A and can be applied to a variety of different uses.

8, The shell of the circuit breaker is made of thermal-setting material, with high heat resistance and impact strength, high dielectric strength.

9,Circuit breaker is of standard modular structure, which is small in size and light in weight. The mounting parts are made of sheet metal and springs, which can be securely mounted on a standard 35mm rail.

10, The circuit breaker can be connected with a variety of accessories, such as locking device for locking the handle which can prevent unrelated personnel to operate the circuit breaker. In addition, there are also auxiliary switches, fault alarm switch, shunt release, under-voltage tripping and other accessories for selection.

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The function of the circuit breaker

1, Control function:it is depending on operational requirements to remove or put into some of the power equipment or lines.

2, Protection function: When a power device or a line fails, a relay and an automatic device act on the circuit breaker to quickly remove the fault from the power grid to ensure normal operation of the non-failure portion of the power grid.

Other Related Articles:

Difference between MCB miniature circuit breaker and MCCB molded case circuit breaker

Classification of circuit breaker

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By | 2018-11-14T12:38:32+00:00 April 30th, 2018|circuit breaker|