The meanings of the letters on Chint contactors are as follows

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1. **Letters on the Main Contact Terminals**
- **L1, L2, L3 and T1, T2, T3**: In a three-phase AC contactor, L1, L2, and L3 are the incoming terminals of the AC contactor, which are used to connect to the three-phase power supply. Usually, they are connected to the three live wires (phase A, phase B, and phase C) of the three-phase alternating current. T1, T2, and T3 are the outgoing terminals, which are connected to the controlled three-phase loads, such as three-phase motors. The current forms circuits from L1 - T1, L2 - T2, and L3 - T3 to control the on and off of the load.

2. **Letters on the Auxiliary Contact Terminals**
- **NO (Normally Open) and NC (Normally Closed)**:
- **NO**: It represents the normally open auxiliary contact. When the contactor is not energized and attracted, the normally open auxiliary contact is in an open state. When the contactor coil is energized and attracted, the normally open auxiliary contact closes. The normally open auxiliary contact can be used to achieve some signal feedback, interlock control, and other functions after the contactor is attracted. For example, connect an indicator light to the normally open auxiliary contact. When the contactor is attracted and the equipment is running, the indicator light will turn on, indicating that the equipment is in operation.
- **NC**: It represents the normally closed auxiliary contact. When the contactor is not energized and attracted, the normally closed auxiliary contact is in a closed state. When the contactor coil is energized and attracted, the normally closed auxiliary contact opens. The normally closed auxiliary contact is often used for some safety control or interlocking with other control circuits. For instance, in the forward and reverse control circuit of a motor, the normally closed auxiliary contact of the forward contactor is connected in series in the control circuit of the reverse contactor to prevent the two contactors from being attracted simultaneously and causing a power short circuit.

3. **Letters on the Coil Terminals**
- **A1 and A2**: These are the terminals of the contactor coil. A1 and A2 are connected to the control power supply. When an appropriate voltage (such as AC 220V, 380V, or DC 24V, etc., specifically according to the specifications of the contactor) is applied across A1 and A2, the contactor coil generates a magnetic field, causing the main contacts and auxiliary contacts of the contactor to act, thereby achieving the control of the circuit. For example, when an AC 220V power supply is connected across A1 and A2, if the contactor is an AC contactor with a rated voltage of 220V, the coil will be energized, and the contactor will be attracted.

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