Work original title of circuit breaker

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

When a short circuit, the large current (generally 10 to 12 times) generated by the magnetic field to overcome the force spring,

Release pulling operation mechanism. The instantaneous tripping switch. When the overload, the current becomes large, the heat increased, the double metal piece of deformation to a certain extent, promote the body action (the greater the current, the shorter the action time).

There are electronic type, using the phase current transformer collection size, compared with the set value, when the current abnormal signal microprocessor, the electronic circuit breaker operating mechanism to drive the action.

Circuit breaker's function is to cut off and to connect the load circuit, as well as cut off the fault circuit, prevents the accident to expand, guaranteed safe operation. The high voltage circuit breaker to open 1500V, the current 1500-2000A arc, the arc can be extended to 2m still continue to burn not put out. Therefore, the arc is a high voltage circuit breaker must solve the problem.

The principle of arc blowing arc quenching is the main cooling heat weakened arc free, on the other hand by blowing arc arc elongated reinforced composite and the diffusion of charged particles, while the charged particles dispersed in the arc gap, the insulation strength rapid recovery medium.

The low voltage circuit breaker is also called the automatic air switch, which can be used to connect and break the load circuit, and can also be used to control the motor which is not frequently started. It functions as a switch, over-current relay, voltage collapse relay, thermal relay and electrical leakage protector, part or all of the sum function, is a kind of important protective devices in low voltage distribution network.

Low voltage circuit breaker with a variety of protection functions (overload, short circuit, under voltage protection, etc.), the value of the action can be adjusted,

High breaking capacity, easy to operate, safe and so on, so it is widely used at present. The structure and working principle of low-voltage circuit breaker by the operating mechanism, contact, protection device (various release), composed of arc extinguishing system.

The main contact of low-voltage circuit breaker is by manual operation or electric switch. The main contacts are closed, free trip will lock in the closing position on the main contacts. A coil and heat release current release heat element and a main circuit are connected in series, in parallel coil and power supply voltage tripping device. When the circuit is short circuited or serious overload when the armature is attracted over current release, the free trip, disconnect the main contact main circuit. When the circuit is overloaded, the heating element heat release heat bend double metal sheet, promoting free trip action. When the circuit under voltage, under voltage release of the armature release. The free trip action. Shunt tripping device is used as a remote control, in normal operation, the coil is de energized, in need of distance control, press the start button, the coil is energized, the armature drive free trip action, to disconnect the main contact.