Air switches, also known as air circuit breakers, are a type of circuit breaker. It is a switch that automatically turns off when the current in the circuit exceeds the rated current. The air switch is a very important electrical appliance in the low voltage distribution network and the electric drive system. It integrates control and various protection functions. In addition to being able to complete the contact and breaking circuit, it can still protect the circuit or electrical equipment from short circuit, severe overload and under voltage, etc., and can also be used to start the motor infrequently. However, it is always a part of consumers who do not understand the causes of air switch tripping . This problem has been plagued by people all along. Perhaps one of the reasons we most easily think of is quality. Don't worry, next I will analyze the reasons for the air switch trip from several aspects, hoping to help everyone.
Air switch working principle
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 working environment
The use of air switches has certain environmental requirements, so everyone should pay attention when they are used in overheated or overcooled areas.
Ambient air temperature: ambient air temperature upper limit +40 °C; ambient air temperature lower limit -5 °C; ambient air temperature 24h average does not exceed +35 °C.
Altitude: The altitude of the installation site does not exceed 2000m.
Atmospheric conditions: Atmospheric relative humidity does not exceed 50% at ambient air temperature of +40°C; higher relative humidity may be obtained at lower temperature; monthly average maximum relative humidity of wettest month is 90%, and the month's The monthly average minimum temperature is +25°C, taking into account the condensation that occurs on the surface of the product due to temperature changes.
Pollution level: Pollution level 3 is filthy.
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.
Air switch quality
The air switch is a commonly used safe electrical device in the home. The quality of the air switch is related to the safety of electricity in the home. Therefore, you need to buy a good quality air switch. The following points will help you to buy a good air switch.
1, the most basic method is to look at the weight of the air switch, in general, high-quality air switch shell with flame-retardant PC plastic, internal use of pure copper wire, the more the number of laps the more quality.
2. Next, look at the arc switch inside the air switch. The arc extinguishing cover is used to generate an arc when the circuit is short circuited and overloaded. If the arc cannot be smoothly extinguished, it will cause a fire phenomenon. This is very important. The national standard's arc extinguishing chamber consists of Nine iron pieces.
3. Whether the switch surface meter has IEC standards, CCC certification, Great Wall certification, PICC China Insurance Quality Certification, whether there is GB10963 and other signs.
4, as far as possible the choice of regular manufacturers of air switches, observe the work, shake it, if there is a sound, and pay attention to whether there are imitation pseudo signs and appearance of the font distinction.
5, pay attention to the color of the material, the color of the handle, and whether the handle feels good.
6, the coil is electromagnetic induction, if the short-circuit and overload induction coil will pull the release, make it clutch, so the number of turns in the air switch inside the copper coil as possible as possible.
Air switch trip reason
There are four general causes of air switch trips: overload protection, circuit short-circuit protection, leakage protection, and under-voltage protection. These four causes will cause the air switch to trip.
The air switch trip condition is as follows:
1, the air switch current setting value is too low, the power of the load is greater than the rated power of the air switch. For example, the switch setting values ​​of the cabinet air conditioner circuit and the electric water heater circuit should be 20A instead of 16A for the general circuit (this is also the case for high-powered Yuba).
2. The connector of the load is not very firm, partly through the electrical wiring of the manual connection, and the connector is not pressed tightly.
3, there is a short circuit in the line, check the electrical plug is dry.
4, the line aging leakage, resulting in both the live line and the zero line, you can check the leakage protection device, if jumped, that electrical leakage.
5, to determine the home line and electrical problems are no problem, then the quality of the air switch itself is off.
Editor's summary: The above is what the air switch, air switch trip analysis of the causes of the relevant description, hoping to help meet the needs of friends! For more information, please continue to follow our website. Follow-up will present more exciting content!
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