AC contactor is mainly composed of four parts: electromagnetic system, contact system, arc extinguishing device, insulating shell and accessories. In Basics for a Beginner Electrician, we only discuss the widely used AC contactors. Although the AC contactor is very common in life, many people know little about it. Today, the editor will share its related knowledge with you, including: AC contactor, communication skills, three characteristics of AC contactor, based on the standard of contactor, the reasons for the burning of the contactor coil are analyzed, exchange What are the faults of the contactor? Select the switch for the contactor. let me see!
Three characteristics of AC contactors:
1. AC contactor coil. The coil is usually defined by A1 and A2, and can be divided into AC contactors and DC contactors. We often use AC contactors, 220/380V is more commonly used:
2. Main contact AC contactor. L1-L2-L3 is connected to the input terminal of the three-phase power supply, and T1-T2-T3 is connected to the power outlet, which can be used to connect the load line. The main contact of the AC contactor is a normally open contact, which is mainly connected to the main circuit to control the start and stop of the motor and other equipment!
3. Auxiliary contacts of contactors. Auxiliary contacts can be divided into normally open contacts and very closed contacts.
(1) Normally open point number. Usually, the normally open point number is mainly used for contactor self-locking control and transmission of operation signals. If the contactor normally open point number is connected to the red indicator light, it can be used as the motor running indicator light. When the contactor is energized, the normally open point no is closed, and the indicator light is turned on to transmit the running signal of the motor or circuit.
(2) The normally closed point NC of the AC contactor. Under normal circumstances, the normally closed point NC of the contactor is mainly used for circuit interlocking and signal transmission.
For example, the interlock function of the contactor normally closed point NC is used in the forward and reverse control circuits of the motor.
For example, the normally closed point NC of the contactor is connected to a green indicator light, which can be used as a stop indication for a circuit or motor.
