The most common distribution boxes generally include air switches, earth leakage circuit breakers, and overvoltage and undervoltage protectors. Together, they work together to protect the safety of electricity. There are also differences between them. What are the differences?
1
air switch
An air switch, also known as an air circuit breaker, is a type of circuit breaker that is a switch that automatically opens when the current in the circuit exceeds the rated current. In addition to different circuits in the home, such as lighting and bathroom electrical circuits, it can be controlled by air switch, and can also protect the circuit or electrical equipment from short circuit, severe overload, etc., and can also be used to start the motor infrequently. .
2
Leakage circuit breakers
Leakage circuit breaker refers to a switch that can automatically operate when the leakage current in the circuit exceeds a predetermined value. It is also called a leakage protector, or a leakage switch.
Commonly used leakage circuit breakers are divided into two types: voltage type and current type. The current type can be divided into electromagnetic type and electronic type. Leakage circuit breakers are used to prevent personal electric shock. They should be selected according to the different requirements of direct contact and indirect contact.
3
Overvoltage and undervoltage protector
The over-voltage, over-voltage and under-voltage protectors are mainly used for devices that have sudden changes in the grid voltage, and that can automatically and automatically cut off the power supply when over-voltage, over-voltage, and under-voltage.
4
Surge protector
Surge protectors (surge protectors), also known as lightning arresters, referred to as (SPD), protect against indirect lightning and direct lightning effects or other transient overvoltage surges.
When normal, the surge protector has an infinite resistance, which is equivalent to an open circuit. When a transient overvoltage or overcurrent occurs in the circuit, the surge protector will turn on quickly, thereby introducing overvoltage or overcurrent into the ground.
The surge protector is divided into three levels according to the area to be protected.
The first level surge protector can be applied to the main power distribution cabinet in the building, and can discharge the direct lightning current, and the maximum discharge current is 80KA~200KA;
The second-stage surge protector is applied to the branch distribution cabinet of the building, and is a protection device for the participating voltage of the pre-stage lightning arrester and the induced lightning strike in the area, and the maximum discharge current is about 40KA;
The third-level surge protector is applied to the front end of important equipment and is the ultimate means of protecting the equipment. It protects the LEMP and the residual lightning energy through the second-stage air defense arrester. The maximum discharge current is about 20kA.
The difference between air switch, leakage circuit breaker, overvoltage and undervoltage protector, surge protector
1. The function of the leakage protector: to solve the leakage problem, such as human body electric shock, the current flows through the human body to the ground, generally more than 30 mA, the leakage protector will cut off the power supply, thus avoiding the current damage to the human body.
2, the role of the air switch: when the current through the switch exceeds a certain current, it will cause the switch to trip and cut off the power due to heat to the metal sheet, and the protection circuit will not be burned due to excessive current, only to protect the circuit. .
3. Overpressure and overvoltage undervoltage protector: The main function is to comprehensively monitor, control and protect the voltage.
4, surge protector: mainly used for lightning protection and over voltage.
Summary: Leakage protector and air switch only control the current, ignoring the voltage control, adding overvoltage and undervoltage protector and surge protector based on the leakage protector and air switch, realizing the current and voltage Protection, so as to avoid damage to life and property caused by abnormal surge of current and voltage.
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