How does a universal circuit breaker work?

Universal circuit breaker, also known as frame circuit breaker: a kind of mechanical switching electrical appliance that can turn on, carry and break the current under normal circuit conditions, and can also turn on and carry a certain time and breaking current under the specified abnormal circuit conditions.

Principle. The universal circuit breaker is in the form of three-dimensional arrangement, and the contact system and the left and right side panels of the instantaneous overcurrent tripper are installed in one.

block insulating board. The upper part is equipped with an arc extinguishing system, and the operating mechanism can be installed in front or on the right side, with "split", "close" indication and manual disconnection.

Button. It is equipped with a shunt trip in the upper left and an undervoltage trip connected to the trip half shaft in the back. Rapid saturation current transformer or current.

The voltage converter is sleeved on the lower bus. Undervoltage delay devices, thermal relays, or semiconductor trippers can be mounted underneath.

dw15-2000、

The circuit breaker is a three-dimensional arrangement, consisting of a frame, a side plate and a beam, and each phase contact system is installed on the chassis and an arc extinguishing chamber is installed on it. The operating mechanism is located in front of the right side of the circuit breaker and is connected to the contact system by a spindle. The electric operating mechanism is connected with the mechanism through a square shaft.

It is installed in the lower part of the circuit breaker as a whole, which is used for energy storage or direct closure of the circuit breaker, and the closure after energy storage is undertaken by the energy-releasing electromagnet. On the left side.

An anti-bounce mechanism is installed above the plate to prevent the circuit breaker from bouncing when disconnected. All kinds of overcurrent trippers are installed under the circuit breaker according to different requirements, and the undervoltage, shunt tripper and electric operation control part are installed on the left side, wherein the undervoltage and shunt tripper are connected to the amplification mechanism through the tripper.

to reduce the tripping force of the circuit breaker. 12 pairs of auxiliary contacts are used by the user to connect the secondary circuit, and there are fingers on the panel to show the working position of the circuit breaker.

Signs "1", "0" and "Energy Storage" indicates, as well as buttons "1" and "0" for closing and opening (both pressed). dw15-1000、

The 1600 circuit breaker is attached with a frontal manual operated handle; The DW comes with a manual handle for access (all can be removed).

The working principle of the universal circuit breaker, the operation of the universal circuit breaker, follow the professional master to learn the right!

The function of the circuit breaker is to cut off and turn on the load circuit, as well as cut off the fault circuit, to prevent the expansion of the accident and ensure safe operation. The high-voltage circuit breaker should break the arc of 1500V and the current is 1500-2000A, which can be stretched to 2m and continue to burn without extinguishing. Therefore, arc extinguishing is a problem that must be solved by high-voltage circuit breakers.

On the other hand, the arc blowing and elongating the arc strengthens the recombination and diffusion of charged particles, and at the same time blows away the charged particles in the arc gap to quickly restore the dielectric strength of the medium.

The circuit breaker is generally composed of a contact system, an arc extinguishing system, an operating mechanism, a tripper, a shell, etc.

When there is a short circuit, the magnetic field generated by the high current (generally 10 to 12 times) overcomes the reaction spring, the tripper pulls the operating mechanism to act, and the switch trips instantaneously. When overloaded, the current becomes larger, the heat generation intensifies, and the bimetal sheet deforms to a certain extent to push the mechanism to act (the larger the current, the shorter the action time).

Now there is an electronic type, the transformer is used to collect the current of each phase, and compared with the set value, when the current is abnormal, the microprocessor sends a signal to make the electronic tripper drive the operation mechanism.

When it should be broken, it will be chaotic. That's how it works.

The working principle of the circuit breaker is that when there is a short circuit, the magnetic field generated by the large current overcomes the reaction spring, the tripper pulls the operating mechanism to act, and the switch trips instantaneously.

When overloaded, the current becomes larger, the heat generation intensifies, and the bimetal sheet deforms to a certain extent to push the mechanism to act (the larger the current, the shorter the action time).

The circuit breaker has an electronic type, and the transformer is used to collect the current of each phase, and compared with the set value, when the current is abnormal, the microprocessor sends a signal to make the electronic tripper drive the operating mechanism to act.

A circuit breaker is a switchgear that can close, carry and break the current under normal circuit conditions and can close, carry and break the current under abnormal circuit conditions within a specified time.

In modern society, electricity is already one of the necessary conditions for survival. The safety of electricity has also become the focus of people's attention, especially people's over-dependence on electricity, and there are countless large and small household appliances in life. To protect the safety of circuits, circuit breakers are one of the tools.

So what is the function of a circuit breaker?

The role of the circuit breaker.

Circuit breaker refers to a switchgear that can close, carry and break the current under normal circuit conditions, and can close, carry and break the current under abnormal circuit conditions within a specified time.

The circuit breaker can be used to distribute the early electric energy of the gear shortage, start the non-synchronous motor infrequently, protect the power supply line and the motor, and automatically cut off the circuit when they occur serious overload or short circuit and undervoltage and other faults, and its function is equivalent to the combination of fuse switch and overheating and underheating relay. In addition, it is generally not necessary to change the parts after the fault current is switched off.

How circuit breakers work.

The live wire of the circuit is connected to both ends of the switch. When the switch core is turned on, the current can magnetize the electromagnet, and the magnetic force generated by the electromagnet increases with the increase of the current, and the magnetic force decreases when the current decreases. When the current jumps to a dangerous level, the electromagnet generates a magnetic force large enough to pull a metal rod connected to the switch linkage, tilting the moving contactor and leaving the static contactor, cutting off the circuit to interrupt the current.

The bimetal strip design is also the same principle, the difference is that there is no need to give energy to the electromagnet, but to let the metal strip bend itself under high current, and then start the linkage device The circuit breaker plays an important role in protecting household electricity, which can disconnect the circuit in time, avoid damage to household appliances and ensure the safety of electricity. Correctly understanding the role of circuit breakers and understanding the necessity of circuit breakers can enable more owners to realize the importance of household electricity safety.

The working principle of the circuit breaker is as follows:

When the short circuit occurs, the high current, generally 10 to 12 times, generates a magnetic field customer service force spring, the tripper pulls the operating mechanism to act, and the switch trips instantaneously. When overloaded, the current becomes larger, the heat is intensified, and the bimetal sheet is deformed to a certain extent to promote the action of the mechanism, the larger the current, the shorter the action time.

The main component of the leakage protector is a magnetic ring inductor, and the live wire and the neutral wire are wound several times on the magnetic ring by parallel winding, and there is a secondary coil on the magnetic ring. When the live and neutral wires of the same phase are in normal operation, the magnetic flux generated by the current is exactly offset, and the voltage is not induced in the secondary coil.

If there is leakage on a certain line, or the neutral wire is not connected, the current of the live wire and the neutral wire passing through the magnetic ring will be unbalanced, and the magnetic flux through the magnetic ring will be generated, and the voltage will be induced in the secondary coil, and the tripper will be tripped through the electromagnet.

Low-voltage circuit breakers, also known as automatic air switches, can be used to turn load circuits on and off, as well as to control motors that start infrequently. Its function is equivalent to the sum of some or all of the functions of electrical appliances such as knife switches, overcurrent relays, loss of voltage relays, thermal relays and leakage protectors, and is an important protective appliance in the low-voltage distribution network.

Low-voltage circuit breakers are widely used because of their advantages such as a variety of protection functions (overload, short circuit, undervoltage protection, etc.), adjustable dynamic and prudent values, high breaking capacity, convenient operation and safety. Structure and working principleThe low-voltage circuit breaker is composed of an operating mechanism, a contact, a protection device (various trippers), an arc extinguishing system, etc.

The main contact of the low-voltage circuit breaker is either manually operated or electrically closed. After the main contact is closed, the free trip mechanism locks the main contact in the closing position. The coil of the overcurrent tripper and the thermal element of the thermal tripper are connected in series with the main circuit, and the coil of the undervoltage tripper and the power supply are connected in parallel.

When a short circuit or serious overload occurs in the circuit, the armature of the overcurrent tripper is engaged, so that the free tripping mechanism operates.

The main contact disconnects the main circuit. When the circuit is overloaded, the heat of the thermal element of the thermal tripper causes the bimetal sheet to bend and push the free release mechanism to act. When the circuit is undervoltage, the armature of the undervoltage tripper is released.

It also makes the free trip mechanism move. The shunt tripper is used for long-distance control, and when it is working normally, its coil is powered off, and when distance control is required, press the volt to hold the start button to energize the coil.