In order to ensure the safety of electricity use, as far as the current situation is concerned, air switches have become common in every home. Although we are all using them and even see them every day, I don’t think everyone may be familiar with them. As you know, what is an air circuit breaker and what types of air circuit breaker are there? Now follow my steps and let’s re-understand what air-conditioning is and the relevant introduction to the working principle of air-conditioning! Maybe it will help you!

What is a circuit breaker?

A circuit breaker, also known as an automatic switch, low-voltage circuit breaker, etc., is a common circuit protector in homes and projects. When the operating current exceeds the rated current, a short circuit , voltage loss, etc., it automatically cuts off the circuit to achieve a protective function. In addition to the protection function, it can also be used in conjunction with leakage, measurement, electrical operation and other modular units. In low-voltage power distribution systems, it is often used as a terminal switch or support The circuit switch replaces the fuses and knife switches commonly used in the past.

Working principle of the circuit breaker

The internal structure of the circuit breaker uses the thermal expansion of a bimetallic sheet to bend the trigger lever, causing the circuit breaker to trip and provide overload protection. There will be a certain time difference during overload protection. When a short circuit occurs, current flows through the induction coil to generate a strong magnetic field, which pushes the lever to trip the circuit breaker quickly.

According to different protection functions, releases can be divided into overcurrent releases and voltage loss releases. There are three tripping modes: thermal, electromagnetic and compound tripping.

When a general overload occurs on the line, although the overload current cannot cause the electromagnetic release to operate, it can cause the heating element to generate a certain amount of heat, causing the bimetallic sheet to bend upward when heated, and push the lever to make the hook and the lock Disengage the buckle, disconnect the main contacts, and cut off the power supply.

When a short circuit or serious overload current occurs in the line, the short circuit current exceeds the instantaneous trip setting current value, and the electromagnetic release generates sufficient suction force to attract the armature and hit the lever, causing the hook to rotate around the rotating shaft base. Turn upward to disengage the lock. The lock separates the three main contacts under the action of the reaction spring and cuts off the power supply.

The tripping mechanism of the switch is a set of connecting rod devices. When the main contact is closed by the operating mechanism, it is locked in the closing position by the latch. If a fault occurs in the circuit, the relevant tripper will act to disengage the latch in the tripping mechanism, and the main contact will quickly break under the action of the release spring.

Air-conditioning brand

Air-conditioning brand recommendation 1. Schneider

Schneider Electric (China) Co., Ltd., Schneider Electric, top ten brands of switches and sockets, Electrical Equipment - Top Ten Electrical Brands, with a glorious history of more than 170 years, a leading brand in the field of global power distribution equipment, a global expert in energy efficiency management, a well-known manufacturer in the electrical field, specializing in the power and automation management industry.

Air switch brand recommendation 2, ABB

ABB (China) Co., Ltd., one of the top ten brands of electrical equipment and one of the top ten electrical brands, was formed by the merger of two century-old international companies. , is a large multinational company with a century-old history, a Fortune 500 company in the world, a leading manufacturer in the field of power and automation technology, and the manufacturer of the world's first self-cooling transformer, high-voltage direct current transmission technology and the first industrial robot.

Air switch brand recommendation 3. CHINT

Zhejiang Chint Electric Co., Ltd., one of the top ten electrician brands, one of the top ten electrical equipment brands in China, a well-known trademark in China, and one of the top 500 private enterprises in China , the largest low-voltage electrical appliance manufacturer in China by production and sales, one of the top 100 enterprises in Zhejiang Province, one of the top 50 most competitive private enterprises in China, a leading enterprise in the manufacturing of electrical products in China, and a listed enterprise.

Air-conditioning brand recommendation 4, Delixi

China Delixi Holding Group Co., Ltd., top ten brands of electrical equipment, top ten air-conditioning brands, Chinese well-known trademarks, Chinese Enterprises 500 Qiang, one of the top 500 private enterprises in China, a leading enterprise in my country's electrical industry, vice president of the China Federation of Industrial Economic Enterprises, and a national large industrial enterprise.

Air-conditioner brand recommendation 5. Merlin Gerin MGE

American Power Conversion Group (APC), a subsidiary of Schneider Electric, Merlin Gerin MGE, top ten brands of air-conditioner, top ten UPS uninterruptible power supply brand, founded in 1920, is a leading brand in the field of global power distribution equipment, one of the largest UPS R&D and production companies in China, and a brand of a world-famous electrical company.

Air switch brand recommendation 6. Great Wall CNC

Great Wall Electrical Group Co., Ltd., founded in 1988, is one of the top ten brands of switch circuit breakers, top ten brands of relays, and top ten brands of electrical equipment , a well-known trademark in China, a famous trademark in Zhejiang Province, a famous export brand in Zhejiang, a national non-regional enterprise group led by industrial electrical appliances, a national high-tech enterprise, an important backbone enterprise group in the electrical equipment industry, and a first-class network supplier of Sinopec.

Quality of the air switch

The air switch is a commonly used safe electrical equipment in the home. The quality of the air switch is related to the safety of electricity in the home, so you need to buy a good quality air conditioner. Open, the following points will help you buy a high-quality air conditioner.

1. The most preliminary method is to look at the weight of the air switch. Generally speaking, high-quality air switches are made of flame-retardant PC plastic shell and pure copper wire is used inside. The more turns, the heavier the weight.

2. Next, look at the arc extinguishing cover inside the circuit breaker. The arc extinguishing cover is used to generate arcs when the circuit is short-circuited or overloaded. If the arc cannot be extinguished smoothly, a fire will occur. This is very important. , the national standard arc extinguishing chamber is composed of nine iron sheets.

3. Whether the switch surface has IEC standards, CCC certification, Great Wall certification, PICC quality certification, and whether it has GB10963 and other marks.

4. Try to choose air switches produced by regular manufacturers, observe the workmanship, shake it to see if there is any sound, and pay attention to whether there are fake signs and fonts on the surface.

5. Pay attention to the color distinction of materials and handles, and whether the handle feels good and has good thrust elasticity.

6. The coil produces electromagnetic induction. If there is a short circuit or overload, the induction coil will pull the release and make it clutch. Therefore, the more turns of the copper coil inside the circuit breaker, the better.

Air circuit breaker selection

Air circuit breaker selection is divided into two parts. One part is to learn how to look at the model specifications of the air circuit breaker, and the other part is to determine the specifications of the air circuit breaker that should be used in the home.

The letter "D" in the air switch model represents power, and the letter "C" represents lighting. Currently, DZ series circuit breakers (small circuit breakers with leakage protection) are used in households. Common specifications include: C16, C25, C32, C40, C60, C80, C100, C120 and other specifications, where C represents the tripping current, that is The tripping current means that when the current in the line is greater than this value, the circuit breaker will automatically trip, thereby protecting the circuit. For example, C32 means that the tripping current is 32 amps. Generally, C32 is used to install a 6500W water heater, and C40 circuit breaker is used to install a 7500W and 8500W water heater.

Generally speaking, the principles for selecting a circuit breaker are: 1. The rated voltage of the circuit breaker must be greater than or equal to the rated voltage of the line; 2. The rated current of the circuit breaker and the rated current of the overcurrent release must be greater than or equal to the calculated load current of the line .

Editor’s summary: The above is an introduction to what an air switch is and how it works. I hope it can help friends who have needs in this regard! For more relevant information, please continue to pay attention to our website. More exciting content will be presented in the future!