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The Function Principle Of Surge Protection

Jul 14, 2017


In the most common surge protection, a component called a metal oxide rheostat (metal oxide varistor, MOV) is used to transfer excess voltage. The MOV connects the FireWire to the ground. MOV consists of three parts: The middle is a metal oxide material, two of semiconductors connected to power and ground. These semiconductors have variable resistors that change as the voltage changes. When the voltage is below a certain value, the electron motion in the semiconductor will produce a very high resistance. Conversely, when the voltage exceeds this particular value, the electronic games change, the semiconductor resistance will be significantly reduced. Type 1 Surge Protection If the voltage is normal, MOV will be idle at the side. When the voltage is too high, MOV can transmit a lot of current, eliminating excess voltage. A simple MOV surge protection consisting of a line regulating part and a fuse is transferred to the ground by MOV, and the FireWire voltage will return to normal, causing the MOV's resistance to increase rapidly again. In this way, Type 1 Surge Protection the Mov only transfers the inrush current while allowing the standard current to continue to power the equipment connected to the surge protection. For example, the role of MOV is similar to a pressure-sensitive valve, only when the pressure is too high to open, to protect the role of the back-end electronic equipment.

What is surge protection?

A: Surge protection is when the electrical circuit or communication line because of the external interference suddenly generated spikes current or over-voltage, Type 1 Surge Protection can be in a very short time to divert the flow, so as to avoid the surge in the circuit of other equipment damage electronic devices.

What is the difference between switch surge protection and surge protection?

A: Switching surge protection is a gap discharge type device, and its lightning energy is large, the main function of the line is to discharge the lightning energy; The limited pressure type surge protection is the ZnO varistor device, its lightning energy drop capacity is small, but its over-voltage suppression ability is good, the main use on the line is to limit overvoltage. Because of this, general at the entrance of the building, such as the Asafe series of switching surge protection to discharge the lightning energy, and then, Type 1 Surge Protection in the back-level circuit using such as the AM series of pressure-limiting surge protection to limit the former level of lightning energy after the discharge, in the back-level line generated high overvoltage. The two kinds of surge protection should be used together to ensure the safety of the equipment in the distribution line.

How to choose the miniature circuit breaker which is compatible with surge protection?

Answer: Asafe switch module because of its damage mode is open, so you can not install miniature circuit breaker, the first module, such as AMI-40, need to choose 63A Break current capacity of 10KA D type miniature circuit breaker; second-level modules, such as am2-20, need to choose 32A Break current capacity of 6.5KA C, Type 1 Surge Protection D type miniature circuit breaker, because of its working curve in the value of the difference, it is recommended to use D-type; third-level modules such as AM3-10, Need to choose 16A Break current capacity of 4.5KA C, D type miniature circuit breaker, by its working curve in the value of the difference, it is recommended to use D.