Maybe everyone has heard of circuit breakers and air switches, and many people may confuse the two. So, is the circuit breaker the same as the air switch? If not, what is the difference between the two? What are the characteristics of air switches and circuit breakers? What is the difference between circuit breakers and air switches? Now I will introduce you to Xiaobian.
Introduction of circuit breakers and air switches
Circuit breaker It is a kind of switch function, and can automatically protect low-voltage distribution electrical appliances. Its function is equivalent to the combination of electrical components such as knife switch, fuse and Thermal Relay. It is mainly used for short circuit and overload protection. Generally divided into 1P That is, only one fire line enters the empty open zero line on the common end, 1P plus N, that is, the fire line and the zero line enter the air open, but the zero line is normally closed, no matter when it jumps or does not trip the wiring, don't make a mistake. , or 2P, that is, the fire line and the zero line are both open and open. Both are normally open and tripped at the same time, .3P or 4P, etc. The working principle is simple, that is, any electric appliance will work at work. Fever. The degree of fever is proportional to the power.
Leakage protector, also known as residual current action protector for short RCD, can be divided into the following three types:
The first without overload. Short circuit protection. RCD with leakage protection only. Also known as leakage switch.
The second with overload protection. Short circuit protection and leakage protection RCD. Also known as leakage circuit breaker.
The third is no overload. Short-circuit protection function. It does not directly split the circuit. Only the RCD of the leakage alarm function is also called the leakage relay. It is generally used for important places of continuous power. The principle is to use the RCD zero-sequence current transformer. To detect. Capture ground fault currents such as leakage, electric shock, etc. and turn off the power of the trip unit. According to its breaking reaction time, it can be divided into high sensitivity, medium sensitivity and low sensitivity.
The leakage protector is a protection device that detects the leakage current or electric shock current of the phase line occurring in the protected power grid, and acts as a trip signal to complete the action and complete the action trip task. In the low-voltage power grid with the leakage protector, under normal circumstances, the leakage current of the grid phase-to-ground (unbalanced leakage current for the three-phase grid) is small, and the operating current value of the leakage protector is not reached. The leakage protector does not work. When a fault such as electric leakage or personal electric shock occurs in the protected power grid, when the current of the component is reached by the leakage protector to reach the leakage or electric shock current value, the leakage protector will give an action trip command, so that the main control The circuit switch action trips and cuts off the power supply, thus completing the task of leakage or electric shock protection.
The difference between a circuit breaker and an air switch:
1. The difference of voltage level: The general air switch is suitable for voltage level below 500V, and the circuit breaker can usually be applied to various voltage levels above 220V.
2. The ability to interrupt the current is different: the load and short-circuit current that the circuit breaker can withstand is generally larger.
3. The difference between arc extinguishing medium and mode: The arc extinguishing medium and method of circuit breaker not only have air circuit breaker, but also vacuum circuit breaker, multi-oil circuit breaker, oil-less circuit breaker, sulfur hexafluoride circuit breaker and so on.
4. The difference between the supporting equipment: Generally speaking, the measurement of the circuit breaker is more complicated than the open circuit, and the logic and the equipment of the executing part are more complicated.
Manual Motor Starter,Motor Starter,KNS12,China Motor Starter
Wenzhou Korlen Electric Appliances Co., Ltd. , https://www.korlen-electric.com