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Contactors are divided into AC contactors (voltage AC) and DC contactors (voltage DC), which are used for power, distribution and power. In the broad sense, a contactor refers to an electrical device in an industrial power system that uses a coil to flow a current to generate a magnetic field and close a contact to achieve control of the load.
The main difference between AC contactor and DC contactor
1. The core of the AC contactor will generate eddy current and hysteresis loss, while the DC contactor has no core loss. Therefore, the core of the AC contactor is made of silicon steel sheets insulated from each other, and is often made into an E-shape. The core of the DC contactor is made of a single piece of mild steel and is usually made into a U shape.
2. Since the AC contactor passes a single-phase alternating current, a short-circuit ring is embedded on the end face of the static iron core to eliminate the vibration and noise generated by the electromagnet, and the DC contactor is not required.
3. The AC contactor uses a grid slice arc extinguishing device, while the DC contactor uses a magnetic blowing arc extinguishing device.
4. The starting current of the AC contactor is large, its operating frequency is up to about 600 times/h, and the operating frequency of the DC contactor can reach up to 1200 times/h.
5. AC contactor can replace DC contactor in emergency, the pick-up time can not exceed 2 hours (because AC coil heat dissipation is lower than DC, this is determined by their different structures), it is really best to use it for a long time. The AC coil has a resistor in series, but the DC cannot replace the AC contactor in turn.
6. The AC contactor has a small number of turns and the number of turns of the DC contactor is large. The volume of the secondary coil can be distinguished from the case where the current of the main circuit is too large (Ie>250A). The contactor uses a series double winding. Coil.
7. The coil of the DC relay has a large reactance and a small current. If you are connected to AC, it will not be damaged. However, the relay of the AC relay has a small reactance and the current is large. If the DC power is connected, the coil will be damaged.
8. The AC contactor has a short-circuit ring on the iron core, and the DC contactor should be free from the principle.
The difference between contactor and relay
1. The contactor is used to switch on or off the power with a large load. It is used in the (power) main circuit. The main contacts may have interlocking contacts to indicate the opening and closing state of the main contacts.
2. Relays are generally used in electrical control circuits to amplify the contact capacity of miniature or small relays to drive larger loads. If you can use the relay contacts to open or close the contactor coil. General relays have more open and close contacts, of course, relays can also achieve certain special functions, such as logic operations, through appropriate connections.
3. The above two points are the same: the contact is opened or closed by the control coils with or without electricity to open or close the circuit. There are contact appliances. The control circuit of the coil is electrically isolated from the electrical circuit in which the contacts are located.
4. Triggers generally refer to digital logic devices (such as integrated chips) that implement certain logic functions through external trigger conditions. Such as d trigger, t trigger, jk trigger, rs trigger and so on. Simple triggers can also be implemented with separate electronics. There are many trigger modes, such as: rising edge, falling edge, high level, and low level.