The air switch and the leakage switch have the commonality: the difference between the switch air switch and the leakage switch: the air switch is tripped when a short circuit accident or fault occurs, and the leakage protection switch is tripped when the person is in an electric shock, and the main realization is to detect the home power supply circuit. There is no abnormal current. The air switch capacity can be large or small, and the leakage protection switch capacity is not easy to be large, and the general single phase is mostly.
air switch
The air switch is a switch that controls the electrical circuit. If air is used as the arc extinguishing medium, it is called an air switch. Generally selected as the rated current (load), used as the main switch of the electrical circuit.
leakage protector
When an air switch has a leakage protection function, it is called a leakage protection switch. If it is an electrical device for leakage protection alone, it is called a leakage protector.
The air switch is different from the leakage switch principle, and the structure is different. It is definitely not a substitute.
1. Leakage means that there is current between the live line and the earth (the neutral line is connected to the earth), and the operating current of the general leakage protection switch is 30 mA.
2. The two wires of the live wire and the zero wire are wound together on the electromagnet. When the cable is used normally, the current flows through the two wires, and the opposite direction is opposite, so the electromagnet does not generate magnetic force; when the electric leakage or electric shock occurs At the same time, it is in contact with the fire line and the earth instead of the hot and neutral lines. The electric shock protector can only protect this situation. Only the current line of the fire line has a current, so the electromagnet generates a magnetic force, and the switch is broken against the spring or other resistance. Open and protect.
3. There is only one set of coils on the electromagnet. When it is used normally, electromagnetic force is also generated. When the current passing exceeds the rated current, the generated electromagnetic force will exceed the spring or other resistance, and the switch will be disconnected to protect.
4, leakage protection switch is only used to prevent people from electric shock and leakage, and the circuit will not protect when the circuit is overloaded (short circuit); the air switch is used to prevent the circuit from overloading (some also have low voltage protection function, the principle can be imagined Know), can not protect the electric shock, just the role of the fuse, the two can not be mixed. The leakage switch can also be said to be a kind of air switch, and the mechanical action and arc extinguishing method are similar. However, since the leakage switch protects mainly the person, the general action value is milliampere.
In addition, the action detection method is different: the leakage switch uses a residual current protection device, which detects the residual current, that is, the algebraic sum of the instantaneous values ​​of the phase line and the neutral current in the protected circuit (including the neutral line) Three-phase unbalanced current and harmonic current). For this reason, the current flow current can only avoid the normal leakage current value (milliampere level), so it can cut off the ground fault very sensitively and prevent direct contact with the electric shock. The air switch is a pure overcurrent trip (safety level). The air switch should be because the current in the circuit is too large (the circuit is short-circuited or the total power of the appliance can be too large, which may cause the current to be too large), and the switch is automatically turned off and the circuit is cut off. The leakage protector also passes the ground and the fire line in the detection circuit. The difference in the current magnitude is used to control the switch. When the live line has leakage (single line electric shock), the current through the incoming line is large, and the current through the incoming ground line is small, causing the magnetic flux around the leakage protector core to change. Turn off the switch automatically and cut off the circuit.
Leakage protector principle: The so-called leakage is the current flowing in and the current flowing out, which means that there are other branches in the circuit loop, which may be the current entering the earth through the human body. According to this principle, the leakage protection is designed. There are two lines of “fire†and “zero†at the access end of the leakage protector. If the currents flowing through the "fire" and "zero" lines are not equal, the induction coil will recognize the slight difference and quickly cut off the switch (trip) through the control section. The leakage current is protected below 30mA.
Air switch principle: The air switch is overload protection. When the loop current exceeds the specified load, the air switch is automatically short-circuited (tripped). Air switches generally have separate "fire" line access protection, as well as "fire" and "zero" access for simultaneous protection.
The functions of the two are different and cannot be replaced by each other!
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