The latest air switch specifications and models

In our daily life or work place air switch everywhere, and often can be used. But many people in the purchase of air switches, the lack of some professional knowledge, in the purchase of air switches do not know which model they should buy which specification. For this reason, I'm here today to tell you about the air switch specifications, but also to prepare some air switch specifications of the purchase method, you can refer to it Oh.

A, what is the air switch

Air switch, also known as air circuit breaker, is a kind of circuit breaker. It is a kind of switch that will automatically disconnect as long as the current in the circuit exceeds the rated current. The air switch is a very important electrical appliance in the low-voltage power distribution network and power drag system, which integrates control and a variety of protection functions in one. In addition to completing the contact and break the circuit, but also on the circuit or electrical equipment short circuit, serious overload and under voltage protection, but also can be used for infrequent start motor.

Second, the air switch specification models

1, the family common air switch specifications

Currently the family use DZ series of air switches, common air switch specifications are as follows: C16, C25, C32, C40, C60, C80, C100, C120 and other specifications, of which the C represents the release current, that is, the starting current, for example, C32 that is the starting current, the C32 that is the starting current. Current, for example, C32 that the jump current of 32 amps, the general installation of 6500W water heater to use C32, the installation of 7500W, 8500W water heater to use C40 open.

2, common industrial specifications

Power circuits with DW and DZ type 20,32,50,63,80,100,125,160,250,400,600,800,1000... (unit A). (Unit A)

3, for example

There are many kinds of air openings, but the model number of the labeling method is more or less the same. Make it easy to understand, but different companies have different names leading to the same product name is different. But the labeling method is still the same. The following is an example of Huazhou air open products to introduce the model specifications of the air open.

Examples:

a, HZM6-63C32/1 where HZ - a business code (Huazhou), M6 - a product model, 63 - a shell frame level, C - a use category: lighting circuit (or general circuit), 32 - a rated current, 1 ---- a 1P (1 pole), air open HZW66-400/3, HZW Universal automatic air circuit breaker, 6-design code; "-400" a rated current (A); "/3" -3 pole.

b, air switch (circuit breaker) polarity and representation

Single-pole 220V cut off the fire line (small circuit breaker); double-pole 220V fire and zero line cut off at the same time (DPN zero line fire line double in and double out circuit breaker); three levels of 380V three-phase line all cut off; four levels of 380V three-phase fire line and a phase of zero line all cut off.

①, the lighting circuit generally choose 10-16A micro break.

②, socket circuits generally choose 16-20A micro break leakage.

③, air-conditioning circuits generally choose 16-25A micro-break.

④, the general switch of household distribution box generally choose 2P/32A-2P/63A micro break or isolation switch.

Three, air open specifications and models to choose and buy

Air open in the household power supply for the total power protection switch or branch line protection switch. When the residential line or household appliances short circuit or overload, it can automatically trip, cut off the power supply, so as to effectively protect these devices from damage or to prevent the expansion of the accident; families generally use two-pole (i.e., 2P) air switches for the total power protection, single-pole (1P) for the branch protection; air switch rated current if you choose the small, the air switch is prone to frequent tripping, resulting in unnecessary blackouts, such as the choice of the Too large, it can not achieve the desired protective effect, so home air switch, the correct choice of rated capacity current size is very important. General small air switch specifications mainly to the rated current distinction 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, etc.; so the general family how to choose or check the total value of the total load current?

1, first calculate the value of each branch current

Pure resistive loads, such as light bulbs, electric heaters, etc. with the indicated power directly divided by the voltage that is obtained, the formula I = power/220v; for example, 20w light bulbs, branch current I = 20W/220 = 0.09A. electric fans, electric irons, electric blankets, electric water heaters, electric heaters, electric rice cookers, electric frying pans, vacuum cleaners, air conditioner, etc. are resistive loads.

Inductive loads, such as fluorescent lamps, televisions, washing machines, etc. Calculation is slightly more complicated to consider the power consumption, specific calculations should also take into account the power factor, etc., in order to facilitate the estimation, the author gives a simple method of calculation, that is, the general inductive loads, according to its stated loads calculated by the power in the doubling can be, for example, stated that the branch of the fluorescent lamps of 20W current I = 20W/220v = 0.09A, doubled to 0.09A * 2 = 0.18A (0.15A than the exact calculated value, more than 0.03A).

2, the total load current that is the sum of the branch current; know the branch current and the total current, you can choose the branch air switch and the total gate air switch, the total fuse, the total meter and the specifications of the branch wires, or check the specifications have been designed to meet the specifications of these electrical components of the safety requirements.

3, in order to ensure safety and reliability, the rated operating current of electrical components should generally be greater than two times the maximum load current required; in addition, in the design, selection of electrical components, but also take into account the possibility of increasing the future electrical load, leaving a margin for future demand.

Four, the working conditions of the air switch

Air switch is not suitable for all places, it is for the working environment, such as air humidity, temperature, altitude air pressure, dirt level, etc., are certain requirements.

Surrounding air temperature: the upper limit of surrounding air temperature +40℃; the lower limit of surrounding air temperature -5℃; the average value of surrounding air temperature in 24h does not exceed +35℃.

Altitude: the altitude of the installation site does not exceed 2000m.

Atmospheric conditions: the relative humidity of the atmosphere does not exceed 50% when the ambient air temperature is +40 ℃; there can be a higher relative humidity in the bottom temperature; the monthly average maximum relative humidity of the wettest month is 90%, while the monthly average minimum temperature of that month is +25 ℃, taking into account the changes in temperature due to the occurrence of product The average monthly minimum temperature of the month is +25℃, taking into account the condensation on the product surface due to temperature change.

Dirt level: dirt pollution level 3.