Why does the control wire of the Chint CJX2-0910 contactor need to be connected to terminal A2?
The control wire of the Chint CJX2-0910 contactor needs to be connected to terminal A2 because **A2 is one of the terminal connections of the contactor coil. By connecting the control wire to A2 and cooperating with the other control wire connected to A1, it can provide the operating voltage for the contactor coil, enabling the contactor to work properly*Chint NXR series thermal overload relays price*:*.
The terminals A1 and A2 of the Chint CJX2-0910 contactor are the two terminal connections of the contactor coil. When the control circuit of the contactor is closed and the current flows through the control wire into the coil between A1 and A2, the coil will generate a magnetic field. Under the action of the magnetic force, the moving iron core of the contactor is attracted, driving the contact system to act, closing the main contacts, thus connecting the main circuit and achieving the control of the load.CHINT circuit breaker price
Generally speaking, if the contactor coil is 220 volts, A1 can be connected to the live wire and A2 to the neutral wire, or A1 can be connected to the neutral wire and A2 to the live wire. If the contactor coil is 380 volts, A1 and A2 should be connected to different phase wires.
In addition, some contactors have two terminal connections labeled A2, and these two A2 terminals are internally connected. The purpose is to make the wiring more convenient, and users only need to connect to one of the A2 terminals.
What will happen if the terminals A1 and A2 of the contactor are connected reversely?
Usually, connecting the terminals A1 and A2 of the contactor reversely will not have a substantial impact on the normal operation of the contactor.
The coil of the contactor is an inductive component, and its working principle is to generate a magnetic field through energization to attract the contacts. For an AC contactor, due to the characteristics of alternating current, the direction of the current is constantly changing, so the voltage polarity at both ends of the coil also changes alternately. Therefore, connecting A1 and A2 reversely will not change the magnetic field effect generated when the coil is energized, and the contactor can still be normally attracted and released to achieve the control function of the circuit.
In practical applications, as long as the correct supply voltage is connected to both terminals A1 and A2, whether A1 is connected to the live wire and A2 to the neutral wire (for a 220V coil), or A1 and A2 are respectively connected to different phase wires (for a 380V coil), and the wiring is firm and reliable, the contactor can work normally even if they are connected reversely. However, for the convenience of maintenance and to follow the unified wiring specifications, it is recommended to wire according to the contactor instruction manual or the conventional practice to avoid confusion during subsequent maintenance or troubleshooting.
