In your opinion, what is the difference between an air switch and a fuse?

1. In addition to the short-circuit protection function of the fuse, the air switch can also realize the overload protection of the circuit.

2. The fuse is a one-time protection device, which must be replaced once it is blown and is very troublesome, so its reusability rate cannot be compared with the air switch.

3. The air switch has an arc extinguishing design, which is not easy to form a short circuit of the power supply due to the generation of arc when cutting off a large load, and the fuse determines that its arc extinguishing capacity has a large gap compared with the air switch due to its installation method, which is easy to lead to short circuit accidents.

4. The action sensitivity of the fuse is worse than that of air.

5. The indication after the fuse is blown is not as clear as the air switch.

6. When the air switch is current, it can jump off, but if it dies, it can only burn out, so it is better to use the air switch. If your family's rice protection and so on add up to a total of 8A of power, then you can choose a 10A air switch.

1.The approximate principle of the air switch is that there is a small hook hooked as a self-locking mechanism after the switch is closed, and the small hook has a small contact, once the contact is resisted, it is immediately released to self-lock to disconnect the circuit, and there is a structure similar to an electromagnet, we know that the magnetic force generated by the electromagnet is related to the size of the current through it, when the current reaches or exceeds the threshold, the electromagnet acts, and the contact is disconnected by the contact.

2.The fuse is simple, the principle of resistance, according to Ohm's law: current = voltage resistance, power formula:

Power = voltage * current, can be obtained current 2 = (power resistance), that is, the current is the power divided by the resistance after the square, the production of the fuse is to use a suitable material to make its power and resistance to meet the required ratio, and the resistance value is small enough for the electrical equipment does not cause the impact of voltage division, when the current exceeds, in fact, it exceeds the working power of the fuse, and the fuse will naturally blow out.

3.In terms of practical application, as long as it is the same nominal current value of the air switch and the fuse, the difference will not be too big, in comparison, the air switch responds quickly, the fuse is slower, but slow also has the benefit of slow, depending on the specific situation. For example:

a.For household use (generally speaking, there are many load styles for household use, and inductive, capacitive, and resistive will appear, such as a fan is a typical inductive load; Computers, televisions, etc. with switching power supplies are capacitive; The electric kettle is resistive), theoretically universal, of course, the choice of fast response air switch, the effect is better.

b.In industrial use, it is necessary to use independent insurance as a safety mechanism for a single high-power equipment, and the characteristics of the load require the selection of air switches or fuses. Inductive, capacitive devices often generate ultra-large currents (e.g.,

Large motor is an inductive load, the speed is zero when starting, and the electrical energy is almost all converted into thermal energy, and only a small part is converted into kinetic energy to pull the motor to start), if the air switch is used here, it will inevitably cause the air switch to trip instantly, if the air switch capacity is increased, the safety is not guaranteed, after all, the large current is only in an instant. Then this is where the fuse comes in. <>

Actually, the fuse is not very suitable for overload protection, so it is more suitable for short-circuit protection.

The circuit breaker can be used not only for short-circuit protection, but also for overload protection. From the point of view of use, the circuit breaker is better than the fuse, and it only needs to be closed again after the action, unlike the fuse, the fuse core needs to be replaced.

Specific application First of all, it is necessary to determine the short-circuit parameters of the distribution system in which you are located. If you don't know, just look at the parameters of the circuit breaker in the distribution box or distribution cabinet, and you can immediately know the short circuit parameters.

After knowing the short-circuit parameters, check the operating current of the equipment. Secondly, look to see if there is a device such as an electric motor in the device. If so, check the current rating of the motor with the highest power.

Once these parameters are known, we can choose the parameters of the circuit breaker.

Rated current of circuit breaker: Sum the rated current of commonly used equipment in the equipment, and let the rated current of the circuit breaker equal to multiple of the sum.

Select the ultimate short-circuit breaking capacity of the circuit breaker: greater than or equal to the short-circuit current of the system.

Select the short-circuit protection setting value of the circuit breaker: this value should be greater than the starting current of the maximum power motor, otherwise, the motor will move together, and the circuit breaker will trip.

That's the main thing. <>

The difference between an air switch and a fuse.

Does the insurance book work the same as the air switch? This must be different, the air switch is only closed through his many vacuum combustion, and the insurance is burned after a short circuit, it will pay attention to the power off, and automatically turn off the voltage.

Both can be used for overcurrent and short-circuit protection, the fuse will blow when over-current and short-circuit, and the air switch will trip. It can be reclosed after treatment.

No. Air switches and fuses are two different types of protection devices.

An air switch, also known as an air circuit breaker, is a type of circuit breaker. It is a switch that automatically disconnects 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 power drive system, which integrates control and a variety of protection functions.

In addition to completing the contact and banquet 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.

Fuse: A fuse is also known as a current fuse, which is defined in the IEC127 standard"Fuse-link"。It mainly plays the role of overload protection.

1. The air switch is convenient and simple, and does not need to be powered off. The fuse needs to be replaced, and it will be in poor contact many times.

2. The air switch integrates control and a variety of protection, in addition to being able to complete the contact and breaking circuits, and can also short-circuit the circuits or electrical equipment.

The main use of air switches is to collapse

1) Under normal circumstances, the armature of the overcurrent tripper is released; In the event of a serious overload or short-circuit fault, the coil connected in series with the main circuit will generate a strong electromagnetic attraction to attract the armature down and jack the locking hook, so that the main contact is disconnected. The undervoltage tripper works on the contrary, when the voltage is normal, the electromagnetic suction pulls the armature and the main contact is closed.

2) In the event of a severe voltage drop or power failure, the armature sail is released and the main contact is disconnected. When the power supply voltage returns to normal, it must be re-closed before it can work, and the voltage loss protection is realized.

The fuse is blown when the current in the circuit exceeds a certain value, which plays the function of protecting the circuit and electrical appliances. The air switch is connected and disconnected from the circuit, when the circuit is overloaded, the air switch with overcurrent protection will also be automatically disconnected, playing the role of protecting the circuit and electrical appliances, the fuse can only be replaced with a new one, and the air switch can be turned on again after disconnection, and repeated use.

The fuse blowing is generally caused by a short circuit in the wire, but it also has a certain relationship with the electricity consumption of the electrical appliances, and the fuse will be burned when the load is large. Eliminate the fault of the air switch, that is, the action current of your air switch is greater than the action current of your fuse, so the air switch has never skipped, whether it is a fuse or an air switch, you must choose the appropriate action current, in order to ensure the safety of electricity at home.

The fuse is single-use, and the circuit breaker is reusable.

The difference between an air switch and a fuse.

Of course. Fuses have been phased out.

Fuse selection requirements:

1) Lighting circuit Melt rated current The sum of the working currents of all lighting appliances on the protected circuit.

2) Electric Motor:

Single direct-start motor Melt current rating (motor current rating.

Multiple direct-start motors Total protection melt rating (sum of currents of each motor.

Step-down starter motor melt rating current (motor rated current.

Wound motor Melt rated current (Motor rated current.

3) The rated current of the melt on the low-voltage side of the distribution transformer (the rated current on the low-voltage side of the transformer.

4) Shunt capacitor bank Melt rated current (Capacitor bank rated current.

5) Welder melt rated current (load current.

6) Electronic rectifier element Melt rated current Rectifier element rated current.

Note: To select a fast fuse Note: The numerical range of the melt current rating is to adapt to the standard part rating of the melt.