A contactor is frequently used to remotely turn on and off the main circuit and the AC and DC control current electrical capacity. Has a large capacity and prompt action to control the use of safe and convenient, can frequently operating advantages and remote operation. Mainly used as the master switch of the motor; small generators; electric equipment; master welder and capacitor banks and other equipment switch. Can be turned on and off load current, but can not cut off the short-circuit current, so often associated with thermal fuses and relays, etc. used in conjunction. Mainly by the contact system; electromagnetic mechanism and interrupter devices and other components. Coil and static contact is stationary, when the coil is energized, the electromagnetic force generated by the reaction force to overcome the spring, will be consolidated so that the moving armature suck; static contact contact, thereby turning on the main circuit. When the coil is de-energized, the electromagnetic suction disappeared, the reaction force of the spring armature rely jump, moving contact and static contact also will be isolated, cut off the main circuit.
Divided by current: AC contactors and DC contactors.
Press the main contact points: unipolar; bipolar and tripolar and so on.
Divided by operating mechanism: electromagnetic; pneumatic and hydraulic.
AC contactor has four main components: (1) electromagnetic systems, including attracting coil, moving core and static iron core; (2) contact system, including three sets of main contacts and one or two groups of normally open, normally closed auxiliary contacts, which are linked together and moving core linked to each other; (3) interrupter device, usually larger capacity AC contactor has interrupter device to quickly cut off the arc burn from the main contact ; (4) insulated housings and accessories, all kinds of springs, transmission, short ring, terminal and so on. 1 an arc chute 2 a contact pressure spring piece 3 a main contact 4 a reaction a coil spring 5 6 7 a quiet one short ring a spring core 8 9 a movable core 10 an auxiliary normally open contact 11 an auxiliary NC contacts, exchanges and contacts are widely used for breaking the power and control circuits. It uses the main contact is opened and closed circuit, with auxiliary contacts to execute control commands. Generally only the main contacts normally open contacts, and often two pairs of auxiliary contacts contacts with normally open and normally closed function, small contactors are often used as an intermediate relay with the main circuit. AC contactor contacts made from silver tungsten alloy with good electrical conductivity and high temperature ablative. Electromagnetic contactor works as follows: After the coil is energized, the magnetic flux generated in the core and the electromagnetic attraction. This magnetic attraction to overcome the spring reaction force that the armature pull drive action contact mechanism, normally closed contacts open, normally open contact closure, interlocking or switched lines. Coil power loss or decrease the voltage across the coil, the magnetic attraction is less than the spring reaction force, making the armature release, contact mechanism is reset, disconnect the line or release the interlock.
When the coil is energized, the electromagnetic suction static core, the moving core pull, due to contact with the moving core linkage system, so moving core driven by three runs while moving contacts, contact closure, thereby turning power supply. When the coil is de-energized, suction disappeared, moving core linkage relies in part on the reaction force of the spring and separation, the main contact is open, turn off the power. There are generally three-phase contactors eight points, three inputs, three outputs, there are two control points. Corresponding output and input are easily able to see it. If you want to increase the self-locking, then you also need the output from a terminal point of the line to the control point on it.
First of all should know that AC contactor works. AC contactor works: When the contactor coil is energized, the coil current produces a magnetic field, so that the static magnetic field generated by the electromagnetic attraction attract core movable core, and promote exchanges and contacts will act normally closed contacts open, often open contacts closed, the two are linked. When the coil is de-energized, the electromagnetic attraction disappears, the armature is released under the action of the spring is released, the contacts recover, normally open contacts open, normally closed contact is closed.
A contactor is used to connect or disconnect a DC main circuit or a large capacity with a load control circuit automatic switch, the main control object is a motor, in addition to other electrical loads such as electric heaters, electric welding, lighting equipment, contactors not only turn on and off the circuit, but also has a protective effect of low-voltage release /. Contactor control capacity. Suitable for frequent operation and remote control. Is one of the important components of the automatic control system.
Many of the specifications from the contactor 10A —- specifications have to 250A. Nor non-use it to control the relatively large current, which is required for the device depends on the degree of the automatic control device itself and on the capacity of …
Contactors connected to the internal traction of the magnet can be called up and down movement of the movable contact contacts, also known as contact bridge, called the stationary contact stationary contacts, their role is cut off. And the circuit is turned on,
Auxiliary contacts are. Interlock according to the degree of contact automatic control of the size of the auxiliary contacts. And self-control contactor start. And stop. You can also use it to take some of the signal lights to indicate contactors, and operation of the device, a., it is not complex appliances, if you open yourself to the foundation electrician, a look will understand ,,,, ….
Universal contactor can be broadly divided into the following categories.
An AC contactor. There are electromagnetic bodies. Contact system. Interrupter devices and other components. . Commonly used CJ10. CJ12. CJ12B other series. . .
2 DC contactor, generally used to control the DC electrical equipment, through the coil to the operation principle and structure of DC, DC contactor AC contactor is basically the same.
AC contactor is opened and closed by the main circuit contacts, with auxiliary contacts to execute control commands.
Generally only the main contacts normally open contacts, and often two pairs of auxiliary contacts contacts with normally open and normally closed function, small contactors are often used as an intermediate relay with the main circuit. AC contactor contacts made from silver tungsten alloy with good electrical conductivity and high temperature ablative.
AC contactor operation of the power from the AC solenoids, solenoid by two “mountain” shape the young quartet built silicon, one fixed and put on top of the coil, the operating voltage has a variety to choose from. In order to make the magnetic stability, core pull faces, plus short-circuit loop. AC contactor after the loss of power, relying on spring return.
The other half is the active core, constructed and fixed core to drive the main contacts and auxiliary contacts open short. More than 20 amps interrupter contacts plus a cover, using electromagnetic force generated when disconnecting circuit, quickly pull off the arc, in order to protect the contacts.
AC contactor production as a whole, appearance and performance is improving, but the function remains unchanged. Whether and to what extent the development of technology, the ordinary AC contactor still has its importance.