I list the explanation below, for 3-phase squirrel-cage rotor motors.
DC and single-phase forward/reverse contactor systems all have the mechanical/electrical interlock so that only one contactor switches supply power to the motor at any time.
The wiring diagrams for special motors can be extremely complex.
A non-reversing contactor is just a single contactor, with three main switching terminals (1 per phase for a 3-phase supply to the motor.)
A reversing contactor is an assembly of two of the above, with a mechanical and electrical interlock between them, so only one contactor can be closed (giving power supply to the motor) at any time. The Forward/Reverse - Up/Down - Left-right etc. are usually opposite motions, and the opposite motions are obtained via labelled switching buttons which energizes the coil of the correct contactor, mechanically locking the other motion contactor and also electrically preventing it from closing.
In the standard 3-phase squirrel-cage rotor motor, the reverse motion is easily obtained by swapping any two of the 3 phase wires to the motor, which then runs in the opposite direction = reverse.
The schematic (Wiring diagram) of a reversing 3-phase contactor assembly is above.
A 3-phase standard non-reversing contactor wiring diagram is shown below, and has been called "Relay".
The contactor control voltages may be mains voltage or a special Control Voltage, often 24V DC is used as a standard Voltage for control systems in industrial switchboards.
I trust that assists you.
Should you need more information, reply here with
Kind Regards....
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