Select OK suitable for a specific application circuit protection devices

Select OK suitable for a specific application circuit protection devices is not difficult, but does require some thought fee. If the electrical and electronic equipment used in the design specifications of making a very loose side of the circuit  Electric energy meter , the device can easily be damaged by shock due to power and led to the disastrous consequences of the fire, on the contrary, if the strict specifications of making a very biased circuit protection devices will cause annoying frequent tripping. The  Air circuit breaker  breakers are mainly thermal circuit breakers, magnetic circuit breakers and earth leakage circuit breakers and other types. In the choice of the circuit breaker, the designer only needs to consider the following characteristics of the circuit, the circuit breaker should also be considered,  electric meter  the installation location and case size limitations: ● The nominal applied ac or dc voltage ● Single-phase, multi-phase, and the number of poles ● applicable national electrical standards and safety management agency standards ● short-circuit breaking capacity a thermal breaker hot series with the circuit breaker using a bimetal. Current overload causes the heat generated during the deformation of the bimetal, so that the circuit breaker. Compared with the fuse, thermal protector has a significant advantage, in that can be reset after tripping. They can also be protected as the power on / off switch. As the temperature increases, the thermal circuit breaker trip speed, and often at a lower current level tripping occurs.