Who knows how to choose an AC contactor?

Generally, the rated current of the contactor is selected, and the principle is one level higher than the rated current of Mada].

There are three conditions for choosing an AC contactor: 1: AC and DC in the circuit. 2: What is the capacity of the equipment in the circuit. 3. The electrical voltage requirements in the circuit are determined. ]

AC contactor is the main electrical appliance in the control of electrical appliances, the correct selection and use, it is very important for electricians, often due to improper selection and use, resulting in undue damage to the contactor. (1) The long-term working current is selected according to the long-term working current, which refers to the load current that the electrical appliance can withstand for a long time. The rated current of the contactor The actual current of the load (2) The selection of the voltage The rated voltage of the contactor The rated voltage of the load.

By current, voltage, AC, DC, application. (Special for switching compensation capacitors, etc.) AC contactor is selected].

Is it OK for kilowatt motors with CJX2-25 contactors? ]

The function of the AC contactor is to turn on or off the power supply, and can replace the automatic switching function that manual switching is not capable of. It is widely used in automatic control, because most of them are used to control AC electrical appliances, so it is more convenient for the contactor itself to share AC power with electrical appliances as a power supply.

1. Control the selection of AC contactors for electric heating equipment.

Such equipment has resistance furnaces, temperature control heaters, etc., and the current fluctuation range of such loads is very small. Therefore, when selecting the contactor, Tanyou only needs to be equal to or greater than the working current of the electric heating equipment according to the agreed heating current of the contactor.

2. Selection of contactors for controlling lighting equipment.

There are many types of lighting equipment, and the starting current and starting time are not the same. If the starting time is slightly longer and the power factor is lower, the agreed heating current can be selected to be larger than the working current of the lighting equipment.

3. Control the selection of contactors for welding transformers.

The welding transformer has a large current without steep cutting due to the short circuit of the electrode on the secondary side, and a large current appears on the primary side, so it is necessary to select the contactor according to the rated power of the transformer, the rated working current, the short-circuit current of the primary side when the electrode is short-circuited and the welding frequency.

Realize weak current control strong current.

Implement remote control function.

The use of AC contactors is as follows:

AC contactor 1L L 3 is the power side of the contactor, connected to the three-phase power supply.

2t t t3 is load side load. no is the normally open contact, and the contact is closed after the power is turned on, and the normally closed contact becomes normally closed. NC is a normally closed contact, which becomes normally open when energized.

The three-phase power supply is connected to the three main contacts of the AC contactor, and the other three main contacts are connected to the motor, and the AC contactor coil is connected to the control circuit, and the suction of the AC contactor can be controlled by the button.

AC contactor: AC contactor is a kind of contactor, and its typical structure is divided into double break direct action type (LC1-D F*) and single break rotation type (LC1-B*). At present, the most commonly used products are mainly CJX2 series, CJ20 series, CJT1 series, 3TB, B series, etc.

AC contactor is a kind of electromagnetic AC contactor with normally open, three-pole main contact, and air as arc extinguishing medium.

Its components include: coil, short-circuit ring, static iron core, moving iron core, moving contact, static contact, auxiliary normally open contact, auxiliary normally closed contact, pressure spring sheet, reaction spring, buffer spring, arc extinguishing cover and other original components, AC contactor CJO, CJIO, CJ12 and so on.