MCCB is generally composed of a contact system, an arc extinguishing system, operating mechanism, release, shell etc..
When the short circuit occurs, the magnetic field generated by the high current (generally 10 to 12 times) to overcome the spring reaction force, release by pulling the operating agency action, the switch instantaneous tripping. When overload, the current becomes large, the heat is increased, and the deformation of the double metal sheet is deformed to a certain extent.
Now have electronic type, use transformer collection the size of each phase current with the set value, compared to when the abnormal current microprocessor signal, electronic tripping device drives the action operating mechanism.
Molded case circuit breaker is cut off and connected to the load circuit, and cut off the fault circuit, so as to prevent the expansion of the accident to ensure safe operation. While the high voltage circuit breaker to open the 1500V, the current 1500-2000A of the arc, these arcs can be stretched to the 2m is still continue to burn. Therefore, the problem of the high voltage circuit breaker must be solved.
Blowing arc arc quenching principle is mainly arc cooling gradually the heat free, another by blowing arc elongating arc strengthen of charged particle recombination and diffusion. At the same time, the charged particles to disperse in the arc gap, rapid recovery of medium strength of the insulation.
Low voltage circuit breaker has many advantages, such as many kinds of protection functions (overload, short circuit, under voltage protection, etc.), the action value can be adjusted, the breaking capacity is high, the operation is convenient, safe and so on, so it is widely used. The structure and working principle of low-voltage circuit breaker by the operating mechanism, contact, protection device (various releases), composed of arc extinguishing system.
The low voltage circuit breaker is also known as the automatic air switch, which can be used to connect and break the load circuit, and can also be used to control the motor without starting frequently. It quite knife switch, over current relay, loss of pressure relay, thermal relay and a leakage protector etc. electrical parts or all of the total function, low-voltage power distribution network is an important protection of electrical appliances.
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 heat element of the current release of the coil and heat release and the main circuit connected in series, under voltage tripping coil and power supply in parallel. When the short circuit occurred or severe overload, over current tripping device attracted armature, free tripping mechanism of action and the main contact breaking away from the main circuit. When the circuit is overloaded, the heating element heat release heat bend on the bimetallic sheet, promote free trip action. When the circuit under voltage, under voltage release of the armature release. The free trip action. Shunt tripping device is as remote control, in the normal work, the coil is power-off, the distance control, press the start button, the coil is energized, the armature drive free tripping mechanism of action, to disconnect the main contact.
Zhejiang Yade Electrical Co. Ltd. is located in "Chinese electric equipment" in Liushi. Professional company engaged in miniature circuit breaker, electric motorcycle circuit breaker, type plastic casing circuit breaker, leakage circuit breaker, dual power supply automatic transfer switch, intelligent million can opening device, surge protector, full automatic undervoltage protector, upspring type floor socket, such as product design, development, manufacturing, sales and service. Products are widely used in industrial, construction, power, communications, aviation and other key projects of power distribution system.
Company website: www.cnyade.com