What is the difference between air opening and leakage protector?

The differences are as follows:

1. Air switch is our usual familiar name, and its correct name is air circuit breaker. The air circuit breaker is generally low-voltage, that is, the rated working voltage is 1kV. An air circuit breaker is a switchgear with a variety of protection functions that can cut off and turn on the circuit at rated voltage and rated operating current.

The type and method of protection are selected by the user according to his needs. Such as short-circuit protection, over-current protection, sub-excitation control, under-voltage protection, etc. The first two types of protection are the basic configuration of the air circuit breaker, and the last two are optional functions.

Therefore, the air circuit breaker can also cut off the electrical circuit under fault conditions (load short circuit, load overcurrent, low voltage, etc.).

2. The correct name of the leakage switch is the residual current protection device (hereinafter referred to as RCD), which is an air circuit breaker with special protection function (leakage protection). It detects the residual current, which is the algebraic sum of the instantaneous values of the phase and neutral currents in the protected loop (including the three-phase unbalanced currents and harmonic currents in the neutral wire). For this reason, the setting value of the RCD, that is, its frontal action current IδN, only needs to avoid the normal leakage current value, which is measured in MA, so the RCD can very sensitively cut off the ground fault of the protection circuit, and can also be used as a backup protection against direct contact electric shock.

The overcurrent protection of the air open is a bimetal sheet, which is equivalent to a mechanical device, and there is no leakage protection function, but the overload is power-off.

The overcurrent protection of the air open is a bimetal sheet, which is equivalent to a mechanical device, and there is no leakage protection function, but the overload is power-off.

The leakage protector is a bridge circuit, when the current of the bridge reaches a certain amount, it is considered that there is leakage, and the power is off.

The leakage protector is a bridge circuit, when the current of the bridge reaches a certain amount, it is considered that there is leakage, and the power is off.

There is a difference between the two, and the general supporting use is to install a leakage protector on the air opening. It has achieved the role of overcurrent and leakage current protection.

There is a difference between the two, and the general supporting use is to install a leakage protector on the air opening. It has achieved the role of overcurrent and leakage current protection.

I work in a power plant, and we come into contact with these two appliances a lot. Air switches and leakage protectors have a common feature. That is, the load circuit can be turned on and off.

The difference is that the air switch can quickly jump off if it exceeds its own rated current. The leakage protector is in the load circuit. If there is damage, humidity and other conditions, the circuit will quickly jump open when it leaks, so the leakage protection switch cannot be used as an air switch.

Because the roles of the two of them are different. However, the leakage protection switch on the market is generally a leakage protector and an air switch in one. In this way, both aspects are functional.

Air opening and leakage protector are completely different, and it is dangerous to not be able to distinguish them, so let's talk about it.

Electrician knowledge: how to distinguish between an air switch and a leakage protector? What's the difference?

1. Different forms of control.

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2. The principle of power failure is different.

The air switch is disconnected by judging whether the loop current is overloaded; The leakage protector is when the human body contacts the live wire, the human body and the live wire form a state of "people", "fire" and "ground", at this time, only the live wire has current, then the electromagnetic magnetic force is generated, and the switch is disconnected.

3. Different levels of protection.

The air switch is overcurrent protection, so it belongs to the safety level, while the leakage protector belongs to the milliampere level, because it is necessary to cut off the power supply in time to prevent someone from being electrocuted, so the level is higher than the air switch.

4. The objects of protection are different.

Air switch - to protect the equipment, the air switch is mainly to monitor the current of the line, if it exceeds its set value, it will jump out of the cut-off circuit. Whether the high current is caused by excessive electrical power or electric shock or insulation damage, it will jump away.

For example, the air switch in the figure is set to 32A, and it will trip when this current is exceeded, while the circuit will not trip if it is less than this current. Generally, the air switch is also installed in the distribution box and is used as the main switch and each branch switch.

Leakage protector - to protect people, leakage circuit breaker has different specifications, now more use two-in-one type (RCBO, leakage plus short circuit overload protection in one), when it is used when leakage is detected, it will be broken. For example, if the water heater leakage is detected by the [leakage protector], the power supply will be cut off to prevent people from being harmed.

Leakage protectors are larger in size than air switches, and are also more expensive than air switches. There is also a test button on the leakage protector, which is recommended to be pressed every month to test whether the leakage trip function is intact.

Electrician knowledge: how to distinguish between an air switch and a leakage protector? What's the difference?

The differences are as follows:

An air switch, also known as an air circuit breaker, is a type of circuit breaker.

It is a switch that will automatically disconnect as long as the current in the circuit exceeds the rated electric current. The air switch is a very important electrical appliance in the low-voltage distribution network and the power drive system, which integrates control and a variety of protection functions. In addition to completing the contact and breaking circuits, it can also protect the circuit or electrical equipment from short circuits, serious overloads and undervoltages, and can also be used to start the motor infrequently.

The leakage protector is an independent electrical appliance, which is different from the circuit breaker and is an obsolete product that is currently recommended to be discontinued, and is different from the leakage circuit breaker often used on the distribution cabinet.

The leakage protector only plays the role of leakage protection, and needs to cooperate with the circuit breaker to achieve comprehensive protection against overload, short circuit and leakage. And the RCB itself includes all of the above functions.

Leakage protector can be classified according to its protection function, structural characteristics, installation mode, operation mode, number of poles and wires, action sensitivity, etc., here it is mainly described according to its protection function and use, which can generally be divided into three types: leakage protection relay, leakage protection switch and leakage protection socket.

Nowadays, every household is inseparable from electricity, and the safety of household appliances is becoming more and more important. In order to protect our electricity safety, all kinds of devices that can disconnect the circuit have been produced, among which we know more about air switches and leakage protectors, but we can't tell the difference between the two, today we will learn about them, learn what is the difference between leakage protectors and air switches. I hope it helps.

Let's take a look at what is a leakage protector, which can also be called a leakage switch, which is used to protect the contacts of dangerous people when leakage occurs in circuit equipment. In addition to protecting personal safety, the leakage switch also has the function of short-circuit protection, which can protect the short-circuit problem of the motor wire.

Next, let's learn about the air switch, which belongs to the circuit breaker, so it can also be called an air circuit breaker. The working principle of the air switch is very simple, when the current in the circuit exceeds the rated value, the air switch will automatically cut off the switch, so as to achieve the purpose of protecting the safety of personnel. In the low-voltage distribution network and the power drive system, the air switch is a very large electrical appliance, which can not only control the circuit, but also protect the circuit, the air switch can also reduce the number of times to start the motor, the use is very large.

After having a certain understanding of air switches and leakage protectors, let's take a look at the difference between leakage protectors and air switches. First of all, the functions of air switches and leakage protectors are similar, they both have the effect of disconnecting the circuit, but the capacity of the air switch will be larger than that of leakage protection devices. Secondly, the appearance of the air switch and the leakage protection device is very similar, but the leakage protector has one more reset button and test button than the air switch.

In the circuit protection of households, leakage protection devices are often used, when the circuit of our household appliances is damaged is to prevent electric shock when a short circuit occurs, it is installed on the circuit of the user's distribution box, as well as the power line of the main distribution box on the floor of the community. The air switch will trip when there is a short circuit, so as to prevent electric shock and protect electrical appliances and personal safety.

Some friends will think that the functions of air switches and leakage protectors are similar, and they can be used interchangeably. This is not the case, although the leakage protector has one more protection function than the air switch, but we cannot replace the air switch with the leakage protector, because the trip function of the air switch is very important in industrial production, which is not solved by the leakage protector.

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The leakage protector is to prevent personnel from being protected when an electric shock accident occurs, such as if someone is electrocuted, the leakage protector trips, and the power output is automatically turned off to avoid the expansion of the electric shock accident.

The air switch is used for overcurrent protection, and the electrical circuit is overcurrent (including short circuit), if the power supply is not cut off, the electrical circuit will heat up, ** or produce a strong arc to ignite other flammable materials, thereby causing electrical fire and causing the accident to expand. But now it's more intelligent, you can really look at Boer-related, and you will benefit.

The leakage protector is composed of adding leakage detection and protection elements on the basis of empty opening.

The air opening only closes and turns on the function, the leakage protector also has the leakage protection function in addition to this, simply put, it is to detect whether the current on the zero line is the same as the live wire, if the leakage live wire and the current on the zero line can not be the same, it can act in time to judge the circuit to play a protective role.

The main difference between an air switch and a leakage switch.

1. The main difference between the air switch and the leakage protector is that the air switch is an active operation switch, while the leakage protector is a passive operation switch.

2. The air switch is an active operation switch, which is switched by human will; The leakage protector is a passively operated switch, which will only operate and complete the disconnection protection when leakage occurs.

When the live wire of the leakage protector is equal to the neutral line current (equivalent to normal electricity), the resultant magnetic field is zero, and the leakage protector will not trip; Once a leakage occurs, the live wire current flows into the earth through the electrocutor, and the live wire of the leakage protector will be different from the neutral current, and the leakage protector will cut off the power supply. -- Leakage is fundamentally different from electricity.

First open the blank, then leak the warranty.

The main gate is open empty.

will act and complete the disconnection protection.

When the live wire of the leakage protector is equal to the neutral line current (equivalent to normal electricity), the resultant magnetic field is zero, and the leakage protector will not trip; Once a leakage occurs, the live wire current flows into the earth through the electrocutor, and the live wire of the leakage protector will be different from the neutral current, and the leakage protector will cut off the power supply. -- Leakage is fundamentally different from electricity.

Electrician knowledge: how to distinguish between an air switch and a leakage protector? What's the difference?

Different control forms, different power-off principles, different hail protection levels, etc.

1. Different forms of control.

The empty switch is disconnected when there is a short circuit in the circuit, while the leak open is when it accidentally touches the electrical shock behavior of the circuit. Its appearance is not the same. For example, if they are all single-pole switches, then we will find that the air switches are half as different as the leakage protection switches.

That is, the air switch feels like just a part of the left side of the leakage protector.

2. The principle of power failure is different.

The air opening is to deduce whether the circuit current is too loaded and disconnected, while the leakage protection is when the human body touches the live wire, then only the live wire has a current, and the switch is disconnected.

3. Different levels of protection.

The air opening is over-current protection, while the leakage protection is milliampere-level, so the power supply should be disconnected immediately.

Precautions for empty installation:

1. When the connection is empty, the connection strength must be moderate, in order to avoid the phenomenon of bolt and nut slippery, if the slip buckle is found, it should be replaced in time, and it can not be continued to be used.

2. When using a screwdriver, it is necessary to tighten the screwdriver with a cover to prevent a slippage, which will affect the normal installation, especially in the box, to prevent damage to the screws.

3. If there is a bolt and nut that is difficult to unscrew, it must not be violently disassembled to prevent a deformation of the nut and increase the difficulty of disassembly. At this time, it is necessary to give a proper beating, or add some loosening agent, and then try to remove the nut.

Air opening and leakage Zen lack of knowledge protector are two different protection devices in the power system, and their main differences are as follows:

Function: Air Open (Air Circuit Breaker) is an electrical switchgear used for overload and short circuit protection. It is able to monitor the current in the circuit and cut off the circuit when the current exceeds its rated current capacity to prevent overloading of wires and electrical equipment.

The Residual Current Device (RCD) is mainly used to detect and protect the safety of human electric shock. It can detect disguised current leakage, and when it detects that the current leakage exceeds the set threshold, the leakage protector will quickly reduce the speed to cut off the circuit, preventing the current from passing through the human body, thereby reducing the risk of electric shock.

Working principle: The air switch detects the current abnormality through the electromagnetic trigger or thermal trigger, and when the current exceeds the set value, the trigger will be triggered and cut off.