Air switch operating principle Air switch often trips

The air switch, also called an air circuit breaker, is one of the circuit breakers. It is a kind of switch which will automatically disconnect the current in the circuit by controlling the current and the constant current. It is often deployed in low voltage distribution networks and electric drive systems. Can control, can play a protective role. Even the best products will inevitably fail. Recently, many people have responded that the air switch often trips. At this time, you must be wondering why the air switch often trips . Do not worry, then I analyze the working principle of the air switch for everyone, the reason why the air switch often trips , I believe we read the following content, will certainly make you benefit!

Air switch introduction

Air switches, also known as automatic switches, low-voltage circuit breakers, etc., are common circuit protectors in homes and projects. When the operating current exceeds the rated current, short circuit, voltage loss, etc., the circuit is automatically cut off for protection, except for the protection function. In addition, it can also be used in conjunction with leaky electrical appliances, measurement, electrical operation and other modular units. In low-voltage power distribution systems, it is often used as a terminal switch or branch switch, replacing the fuses and blade switches commonly used in the past.

The role of air switch

(1) Current-limiting and under-voltage protection: When a short circuit occurs in the wire, a large current will occur, which will cause the electrical device to burn out. The air switch has this function. When the current is greater than this open-circuit current, the switch will clutch. , to achieve the purpose of power failure.

(2) Short-circuit protection: After the air switch is used, both the line short-circuit and the ground will be automatically clutched.

(3) Overload and overheat protection: Overload means that the load is too large, and the heat of the electric wire causes the electromagnetic coil of the air switch to react to the clutch and make it clutch.

(4) Isolation and phase-to-phase protection: Generally the current below 30mA is normal and acceptable to the human body. Above this leakage current, it will be unsafe, so the air switch can isolate the leakage current of more than 30mA within a few minutes. (This value is based on the parameters of the air switch).

(5) Leakage protection: Leakage phenomenon Everyone believes that only earth leakage can occur, and there are only the total open and inductive switch to the reaction, in fact, this is not all, the air switch, single P empty Open will also react to leakage.

  

Air switch works:

The internal structure of the air switch is the use of bi-metal thermal expansion and bending touch trigger levers, so that the circuit breaker tripped to play a role in overload protection. There will be a certain difference in time between overload protection. When a short circuit occurs, current flows through the induction coil and generates a strong magnetic field, which pushes the lever to quickly trip the circuit breaker.

In accordance with the different protection, the release can be divided into over-current release and loss of pressure release and other types of tripping, there are three kinds of thermal, electromagnetic and complex tripping.

When the line is generally overloaded, the overload current can not cause the electromagnetic release to act, but it can make the heat element generate certain heat, promote the bimetal to be heated upwards, push the lever to release the hook and the buckle, and the main touch Head broken, cut off the power.

When a short circuit or severe overload current occurs on the line, the short-circuit current exceeds the instantaneous tripping setting current value, and the electromagnetic release device generates a sufficient suction force to suck the armature and strike the lever, so that the hook moves upwards and rotates the lock seat away from the lock. , The latch will break the three main contacts under the action of the reaction force spring and cut off the power.

The tripping mechanism of the switch is a set of linkage devices. When the main contact is closed by the operating mechanism, it is locked by the locking hook at the closing position. If a fault occurs in the circuit, the relevant trip unit will act to disengage the latch hook in the trip mechanism, and the main contact breaks quickly under the action of the release spring.

  

Air switch model specifications:

C65N 1P-: C1A C2A C4A C6A C10A C16A C20A C25A C32A C40A C50A C63A

C65N 2P-: C1A C2A C4A C6A C10A C16A C20A C25A C32A C40A C50A C63A

C65N 3P-: C1A C2A C4A C6A C10A C16A C20A C25A C32A C40A C50A C63A

C65N 4P-: C1A C2A C4A C6A C10A C16A C20A C25A C32A C40A C50A C63A

C65N 1P-: D1A D2A D4A D6A D10A D16A D20A D25A D32A D40A D50A D63A

C65N 2P-: D1A D2A D4A D6A D10A D16A D20A D25A D32A D40A D50A D63A

C65N 3P-: D1A D2A D4A D6A D10A D16A D20A D25A D32A D40A D50A D63A

At present, households use DZ series air switches. Commonly used are the following specifications: C16, C25, C32, C40, C60, C80, C100, C120, etc.

The common industrial models include: DW and DZ types for power circuits, with specifications of 20, 32, 50, 63, 80, 100, 125, 160, 250, 400, 600, 800, 1000A.

The reason why the air switch often trips

Mainly due to summer air conditioners, water heaters and other high-power electrical appliances concentrated open to cause increased load;

It may also be related to the high humidity in summer.

It is recommended to avoid all high-power appliances working at the same time as much as possible;

Turn to the professional electrician to inspect the electrical equipment and related cables (wire diameter), lines, sockets and connection points;

Attention to strengthen the protection of air switches, the key is moisture.

  

Safe use of air switch precautions

Understand the working principle of the air switch and the reasons for the trip, we also need to pay attention to, in the course of use, the air switch still has many things to pay attention to. Xiao Bian now summarizes it for everyone!

1, the air switch leakage, overload, short circuit and other protection features set by the manufacturer, can not be arbitrarily changed, so as not to affect its performance, and the role of the experimental button is in the air switch in operation for some time, in the closing power The state of its operation is checked.

2. The wiring of the leakage circuit breaker must pass through the load end of the air switch, and no phase or neutral line is allowed to pass through the leakage circuit breaker. Otherwise, artificial “leakage” is caused and the air switch cannot be closed, causing “misoperation”.

3. After the air switch is disconnected due to short-circuit of the line, it must be checked first. If there is serious damage to the head or there is a pit, repair is required. Four-pole leakage circuit breakers should be connected to the neutral line so that the electronic circuit can work normally.

4. After the circuit is connected, check whether the wiring is correct. It can be detected through the experiment button. If the air switch can be correctly segmented, it means that the leakage protector is installed normally, otherwise, the line should be checked and troubleshooting should be done.

Editor's summary: The above is the working principle of the air switch, the air switch often trip causes related to the introduction, we can be used as a reference reference when purchasing. After all, when we buy, we must choose a switch that is suitable for our own use. If it is not appropriate to waste, it will not only cause unnecessary safety accidents, but it will not be worthwhile.

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