Submersible Pump Control Box Wiring Diagram For 3 Wire Single Phase

Today I hear to write about the submersible pump control box wiring diagram, in this post you will completely understand the 3 wire submersible pump wiring diagram which is a single phase submersible pump motor. Why we called a single phase submersible motor a 3 wire submersible, that we also know that we have two wire in single-phase power supply.
As you know that we have two types of winding in a single-phase motor and these coils have also two starting and finishing ends, So we connect the one-one end of each coil and make a common point which know also with the name of the common point. And the other ends called starting and running terminals or connections. So we have 3 wire terminals or wire which out form the motor, that's why we called this 3 wire motor.
In the post, you will completely learn about the single phase submersible pump control box wiring diagram, and this diagram not too hard to understand like their own diagram which is mostly available on the control box backside.

Single-phase submersible pump control box wiring diagram - 3 wire submersible pump wiring diagram


In the submersible pump control box, we use a capacitor, a resit-able thermal overload, and a DPST switch (double pole single throw). The wiring connection of the submersible pump control box is very simple. Here is the complete guide step by step.


  • First of all switch off the main circuit breaker in your distribution board, for that reason that you can work safely and protect yourself from electric accidents.
  • Then connect the supply to input wire connectors. 
Now if the box is not wired then follow the steps and if the box is wired then the last steps are for you.

  • After that get the connection from wire connectors and then connect your neutral and Line wire (hot wire/phase) to the double pole single throw switch as I have shown in the below diagram.
  • Then get a hot wire connection from the DPST switch and connect to the reset-able thermal overload protector. And form overload protector connects this (black wire) to one of the output wire connectors.
  • Now get your neutral wire (blue) from the switch and connect to the capacitor, and form the same terminal of the capacitor connect it to one of the output connectors.
  • Then connect a wire from another free side of the capacitor terminal and connect to one of the out wire connectors which I have shown with red or brown color in the diagram.
  • In 1 number connector connect your ground or earth wire as I have shown in the diagram with green color.


Now you have 4 output wire connectors, in which 1 number for earth connection, 2 number for starting terminals because this wire comes from the capacitor, 3 number for running wire for motor and 4 number for common.
So you need to connect the running, starting and common wire of submersible pump to control box, so mostly in submersible pump 3 wires the Black color wire is common, Blue is Running and Brown or red for starting, But these color can be changed or maybe in your submersible pump different color wire is used. 

First, if you know about the starting, running and common wire then connect it box connector as I have shown in the below single phase 3 wire submersible pump box wiring diagram.

submersible pump control box wiring diagram
single phase submersible pump starter wiring diagram



Now if you did not know about the star, run and common wire in your pump motor then follow the below compressor terminals identifying tutorial and same follow the steps to find out identify submersible pump wires start, run, and common. (Note that identify compressor terminals and submersible wire method is same)

Also, read
How to identify start, run, and common in a single-phase motor or compressor?
How to control a single-phase motor using a circuit breaker?
How to wire resettable overload?
How to control and wire a single-phase motor with a contactor?


In the above wiring diagram, I have shown the complete method of submersible pump control box wiring and installation diagram. Now if you have any questions regarding single phase submersible pump starter wiring diagram then you can use below comment section.


Sikandar Haidar

Electricalonline4u.com is a hub of electrical and electronics tutorials and easy diagrams.

12 Comments

  1. concept is good.
    I would like to have circuit with contactor , Ammeter voltmeter, starting switch with indicator

    ReplyDelete
  2. WHAT SIZE CAPASITOR SHOULD BE USE FOR 2,2HP MOTOR

    ReplyDelete
  3. Another great idea to increase our knowledge.
    thank you sir

    ReplyDelete
  4. The circuit did now show any disconnect for the starting winding.

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