Three phase AC contactor, 380V AC contactor connection

It is connected to the coil line of the contactor, that is, on the side of the contactor, there are two wires, and some are three wires, and two of the three wires are connected, which is convenient for the position of wiring. If it is three lines to see the letters on it and then connect them, for example, to connect 1aand 2a, two 1a is the same line with the change of that one, must not connect two 1a.

The main contact generally only has a normally open contact, while the auxiliary contact often has two pairs of normally open and normally closed contacts, and the small contactor is often used as an intermediate relay with the main circuit. The contacts of the AC contactor are made of silver-tungsten alloy, which has good electrical conductivity and high temperature ablation resistance.

There are different electric shocks on each contactor, and some can be distinguished from power control electric shocks, some are electric shocks of the electromagnetic contactors, and some are contacts that play a locking role. AC contactors are widely used as interrupting and control circuits for electricity. The AC contactor uses the main contact to open and close the circuit, and the auxiliary contact to execute the control command.

The connection method of 220V contactor is the same as that of 380V, but the coil is different. The 380V coils are all phaser wires. The 220V contactor is a neutral wire and a live wire.

The main road 3 and the main contact wire of the 220V contactor must be the live wire, so connect the main contact in series! The second is to control the wire coil, that is, to connect the zero line directly to A1, A2 has two wires, one is connected to the start switch, one is connected to the normal beginning, the other end of the start switch is connected to the reset switch, the other section of the reset switch is connected to the live wire, one is connected to the other end of the normal beginning, which is very simple, as long as it follows the string. It's a good idea to install a thermal relay to protect the pump!

The probe is put on the cable, and the signal processing is carried out, and the output is 4-20mA, RS485, wireless, and used by other testing equipment. The non-contact detection method eliminates the hidden danger of short circuit that may be caused by the contact measurement voltage method. It has two installation methods: closed-loop and open-ended, with a variety of shapes and mounting structures (PCB boards, guide rails, screws); High isolation between the input terminal and the line under test, and high withstand voltage.

Wiring: AC contactors 1L L2 and 5L3 are the power side of the contactor, they are connected to the three-phase power supply.

t t t t3 is the load side load.

Extend your data. AC contactors.

AC contactors often use three arc extinguishing methods: double-fracture arc extinguishing, longitudinal groove arc extinguishing and gate arc extinguishing. It is used to eliminate the arc generated by the dynamic and static contacts during the opening and closing process.

All contactors with a capacity of more than 10 A have an arc extinguishing device. AC contactors also have auxiliary components such as reaction springs, buffer springs, contact pressure springs, transmission mechanisms, bases and binding posts. 30V is the connected two-phase power supply.

When either of the two phases is de-energized, the contactor is de-energized and released, which can also protect the equipment. If you don't connect the phase, it's useless if there is a power outage. The main contacts of the 30V contactor are connected to the incoming and outgoing wires of the power supply.

The main difference between a 30V contactor and a 220V contactor is that the coil control voltage is connected to two phase wires.

Instead of a phase line and a neutral line.

Summary. 380V AC contactor wiring diagram: AC contactor 1L L L3 is the power side of the contactor, connected to the three-phase power supply.

2t t t3 is load side load. The wiring of the direct control mode, the controlled electrical appliance is a single-phase power supply, and the power consumption does not exceed the rated value of the switch (the resistive load does not exceed 25A, and the inductive load does not exceed 20A), and the direct control mode can be adopted. In the wiring of single-phase expansion mode, the controlled electrical appliance is single-phase power supply, but the power consumption exceeds the rated capacity of the switch (resistive load exceeds 25A, inductive load exceeds 20A), then more than one AC contactor with a capacity exceeding the power consumption of the electrical appliance is required to expand the capacity.

380V AC contactor wiring diagram: AC contactor 1L L L3 is the power side of the contactor, connected to the three-phase power supply. 2t t t3 is load side load.

The electrical appliance to be controlled is a single-phase power supply, and the power consumption does not exceed the rated value of the switch (the resistive load does not exceed 25A, and the inductive load does not exceed 20A), and the direct control mode can be adopted. In the wiring of single-phase expansion mode, the controlled electrical appliance is single-phase power supply, but the power consumption exceeds the rated capacity of the switch (resistive load exceeds 25A, inductive load exceeds 20A), then more than one AC contactor with a capacity exceeding the power consumption of the electrical appliance is required to expand the capacity.

Working principle: The contactor is a 380V suction coil, which leads the ABC three-phase one phase directly to the sail hall to one end of the suction car, and then leads the second phase to access the normally open contact of the starting button and the normally closed contact of stopping the button, and the other end of the normally open contact of the starting button is connected to the normally closed contact in the auxiliary contact of the contactor, and is connected to the other end of the suction coil through the other contact. Stop the other end of the normally closed contact is connected to the normally open contact in the auxiliary contact of the contactor, and is connected to the other end of the suction coil through the other contact.