Hey, today we are going to make a connection of double motor control with a selective switch. using this circuit, you can control(turn on or turn off) two electrical motors by just rotating the knob of the selective switch. This circuit mainly designed with a DOL starter, but you can make it with the star delta starter also. Here, you can control only one motor at a time. When one motor is running another motor will remain off condition. This type of arrangement mainly used for water pump control in industries. When one motor needs to keep as a spare to operate at the time of breakdown of the other motor, this double motor arrangement is installed.

## Double Motor Control with Selective Switch Wiring Connection Diagram

First of all. let's take a look at the connection diagram of double motor control with a selective switch. Then we will discuss the components used in this circuit and the working principle.
Click on the image to enlarge.

Now, let's go to know about the components used in this circuit.

### Contactor

Here you can see two contactors are used both are the three-pole 440V contactor having four numbers auxiliary contacts.

Here, two thermal overload relays are used for this circuit both are the three-phase 440V relay having one NC and one NO contact.

### Selective Switch

Here a single-pole three-position selective switch is used in this circuit. This selective having three terminals '1', 'A1', and 'A2'. '1' is the common terminal. 'A1' and 'A2' are for output 1 and output 2.

## Connection Procedure

If you see the connection diagram carefully, you can understand the whole connection diagram easily. All connections are shown properly in the above diagram. Just remember that the input phase terminal is to be connected to the '1' terminal of the selective switch. Then take an output from the 'A1' terminal and connect to the coil of the first contactor through the NC contacts of the overload relay as shown in the above figure. And take an output from the 'A2' terminal and connect to the coil of the second contactor through the NC contacts of the overload relay as shown in the above figure.

## Working Principle

When the knob of the selective switch is in the 'OFF' position the bother motor will be in off condition. When you rotate the knob from the 'off' position to the '1' position then the coil of the first contactor will be energized, and motor 1 will be turned on, and another motor (motor 2) will be in the off condition. When you rotate the knob to the '2' position then the coil of the second contactor will be energized, and motor 2 will be turned on, and another motor(motor 1) will be in the off condition.