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Bushido 10-12-2011 07:00 AM

Contactor for pool pump timer
Need to have the wiring diagram and/or advice on how to properly wire this single pole contactor to the pool pump timer?
Top terminals are 1 A1 R3 bottom terminals are 2 A2 R4 (Model: EATON CR2011230A).
I am a sparky but with limited contactor wiring experience - have to learn sometime!


SD515 10-12-2011 08:19 AM

A1 & A2 are the coil terminals. 1 & 2 are normally open contacts. R3 & R4 are normally closed contacts.

Goggled EATON CR2011230A and this pdf come up:

The beginning of the pdf has a picture of some contactors, and the one on the right is the same model# as yours. It has a diagram on the face of it.

Bushido 10-12-2011 04:52 PM

more information needed
Thanks but there is no wiring diagram in the link you posted?
So if the line comes from the timer to1 and the load (pump) connects to 2. Do the A1 and A2 terminals have to be constantly energised or not for the contactor to function properly?


Techy 10-12-2011 05:00 PM

you dont need the contactor unless your timer isnt rated high enough for the motor

when a1/a2 are energized, the coil closes. Normally Open Contacts(1/2) become closed, Normally Closed(R3/R4) contacts open.

closed = connected, open - disconnected

you want the timer 'load' to go to the coil (a1/a2, 240v coil) a constant hot to go to 1, 'load' to 2 one leg of the 240v circuit is unswitched

Bushido 10-12-2011 11:40 PM

So let me try to clarify.
From 20A C. Breaker to 16A timer then-
from timer to both A1 and A2. Also-
from line side (constant hot) of C. Breaker to 1 then-
pool pump load active to 2.
Pool pump neutral to common neutral link.

right or not, if not please correct?

mpoulton 10-13-2011 12:26 AM

If you have a 16A timer, you probably don't need a contactor. What's the motor rating?

Bushido 10-13-2011 12:56 AM

No the last timer stopped operating-probably because it was not installed with a contactor I have been advised -so in any case I would like to know the answer to the previous question

mpoulton 10-13-2011 01:18 AM

Is this a 120V or 240V circuit? Techy's description assumes 240V, but your mention of a neutral implies 120V. The wiring is slightly different. If 120, you might consider changing to 240V at half the current and skipping the contactor. Really, those timers are made to handle pool pump motors directly. There should be no need for a contactor.

Bushido 10-13-2011 03:54 AM

Sorry mate but you are still not answering the question so I may have to wait for techy or some other person who can give me a definite specific answer or proper wiring diagram.:(

SD515 10-13-2011 08:24 AM

** Bushido, please update your profile with your location. I am thinking you are somewhere that uses a 240v phase to neutral system? North America residential systems are predominately 120v phase to neutral, 240v phase to phase. That may be causing some mis-interpretations on our parts. **

Back to your question:

Contactors act as a switch. They are commonly used when the amperage of the load exceeds the amperage rating of a/the switch, or when multiple circuits are to be switched simultaneously.

!!! Assuming you have a 240v phase to neutral line, all equipment is designed for your voltage system, and you are running all this equipment off of one power feed. !!!

The incoming ‘hot’ line would go to the timer and to the normally open contactor pole #1 (or #2…doesn’t matter, but for clarity sake, we’ll use #1). The ‘hot’ feed to the pump would go to #2 (the other).

The ‘load’ of the timer would go to contactor coil #A1.

The neutral goes to the neutral terminal of the timer, the contactor coil term A2, and to the motor.

Again, this is a phase to neutral set-up, with properly rated equipment. I’ll post a diagram shortly. Also, let us know what type of power system is involved here, ie. 120v phase to neutral, 240v phase to neutral, etc.

SD515 10-13-2011 08:55 AM

1 Attachment(s)
Phase to neutral. Colors are for reference only.

mpoulton 10-13-2011 11:22 AM


Originally Posted by Bushido (Post 747801)
Sorry mate but you are still not answering the question so I may have to wait for techy or some other person who can give me a definite specific answer or proper wiring diagram.:(

Dude, nobody can answer your question until you give us this information. I've told you that twice. You want a wiring diagram, but you are refusing to provide the most basic information required. If it's a 120V circuit, it's wired one way. If it's 240V, it's slightly different. If you're not in the US and it's a 240V phase-to-neutral circuit, then we'd need to know that too. What part of, "Give us the information we need" is so hard to understand?

SD515 10-13-2011 11:45 AM

mpoulton, just fyi…one reason I’m guessing outside North Amer is the contact info at the bottom of the pdf for Eaton Co. Australia, Brasil, UK and the Netherlands are the only countries listed.

Bushido 10-13-2011 04:04 PM

I am in Queensland Australia (240V). My mistake for thinking this was an Australian based website! By the way, the timer is a single pole device too (to suit the din rail) it has a neutral connection. So does that still mean this style of contactor must have a neutral going to it or does the pool pump neutral connect to the common neutral link (with the other lights, power, etc. neutrals).
Does this information change the wiring diagram SD515?

SD515 10-13-2011 10:46 PM

No worries mate.

To get 240v, do you use phase to neutral? What do you get phase to phase?

The contactor terminals A1 & A2 must have 240v going through them to get the contactor to close. If your power is 240v phase to neutral, then a phase line connects to either A1 or A2, and a neutral connects to the other. The phase line can be controlled by the timer.

Beware that the common neutral link you mention has to be large enough to handle the amperage you are putting on it. The motor may require its own circuit? The diagram I posted was intended to give you a basic idea of wiring the timer, contactor and load. Whether the circuit is capable of the amperage to be imposed on it, I don’t know.

There is an Aussie electrician that comes to this board, I’ll ask if he can stop by.

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