The air switch is an indispensable switch for the safety of household electricity. When the safety switch is installed incorrectly, or the air switch you purchased is not suitable for your home voltage, or if the line is connected incorrectly, it may cause a short circuit in the line and cause a safety accident such as a fire. Therefore, understanding the installation of the air switch , the wiring method of the air switch, and the choice of understanding the air switch model are very important for the safety of the home. Here we come together to understand the air switch related knowledge introduction!
What is an air switch
Air switch, also called circuit breaker, is called automatic air circuit breaker. It is a commonly used low-voltage protection appliance and can realize short circuit, overload and other functions. 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. It can also be used to start the motor infrequently. The air switch is used as the main power protection switch or branch line protection switch in the family palace. When a short circuit or overload occurs on a residential line or a household appliance, it can automatically trip and cut off the power, thereby effectively protecting these devices from damage or preventing the accident from expanding.
Air switch principle
The tripping method of the air switch includes three types: thermal, electromagnetic and multiple 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 air 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. In accordance with the different protection, the release can be divided into over-current release and loss of pressure release and other types.
The internal accessories of the air switch are: auxiliary contacts, alarm contacts, shunt release, and undervoltage release; external accessories include: electric operating mechanism, rotating operating handle, extended handle, and handle locking device. When the air switch works normally, it needs to work under the following conditions: 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 degrees Celsius. 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.
Home common air switch models
At present, households use DZ series air switches. The following air switch specifications are common:
C16, C25, C32, C40, C60, C80, C100, C120 and other specifications, where C represents the tripping current, that is, the tripping current, for example, C32 represents the tripping current is 32 amps, the general installation of 6500W water heater uses C32, installation of 7500W, 8500W Water heaters use the C40's empty open.
Industrial common models
DW and DZ types for power circuits are divided into 20, 32, 50, 63, 80, 100, 125, 160, 250, 400, 600, 800, 1000 ... (unit A)
for example:
There are many kinds of products in the air, but the model of the model is roughly the same. It's easy to understand, but different companies have different names that lead to different product names. But the standard method is still the same. The following is an example of the model specifications of the Airbus.
For example:
1, HZM6-63C32/1
Among them, HZ---a company code (Huazhou), M6-a product model, 63-a chassis level, C---a use category: lighting circuit (or general circuit), 32-one rated current, 1----1P (1 pole), open HZW66-400/3, HZW universal automatic air circuit breaker, 6-design code; "-400" rated current (A); "/3"-3 pole .
2. Polarity and Representation of Air Switch (Circuit Breaker)
Unipolar 220V cut-off live wire (miniature circuit breaker); bipolar 220V live wire and neutral wire cut off at the same time (DPN zero line fire double in double out circuit breaker); three 380V three-phase line all cut off; four 380V three-phase fire wire phase All zero lines are cut off. 1, the lighting circuit is generally selected 10-16A micro-off. 2, socket circuit generally choose 16-20A micro-leakage leakage. 3, air conditioning circuit generally choose 16-25A micro-off. 4, the general distribution switch box households choose 2P/32A-2P/63A micro-break or isolation switch.
The role of air switch
Under normal conditions, the armature of the over-current release of the air switch is released; in the event of a severe overload or short-circuit fault, the coil in series with the main circuit will generate a strong electromagnetic force to attract the armature downwards and top Unlock the hook and disconnect the main contacts. The operation of the undervoltage release is just the opposite. When the voltage is normal, the electromagnetic attraction sucks the armature and the main contact is closed. In the event of a severe voltage drop or power failure, the armature is released and the main contact opens. When the power supply voltage returns to normal, it must be reclosed before it can work, and the loss of voltage protection is achieved.
Cause of air switch trip
There are a number of reasons why the air switch often trips. The first reason may be that the life of the air switch is almost enough to remind you to replace it. It may also be because there is too much load in the home, so it is self-protected when the power is too high.
Summer air-conditioning, water heaters and other high-power appliances to open the cause increased load;
It may also be related to the high humidity in summer.
Recommendation: Avoid all high-power electrical appliances at the same time as much as possible; seek help from professional electricians often check electrical appliances and related cables (wire diameter), lines, sockets and connection points; pay attention to strengthen the protection of air switches, the key is moisture.
Editor's summary: When we encounter a trip condition, first determine whether the tripping air switch is a master switch or a branch outlet switch in the distribution box at home. If the main switch is not tripped, but the shunt switch trips, it indicates that there is a problem with the wiring of the high-power electrical supply line, that is, multiple high-power electrical appliances are connected to the same branch switch. In such cases, the high-power electrical line is adjusted to light load. The shunt switch can be (a high-power electrical appliance is recommended to use a separate shunt switch); if the shunt switch does not trip, the main switch trips, then calculate whether the sum of household appliances power exceeds the power supply approval capacity, and check whether the total switch capacity is Power supply approval capacity matching.
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