Eaton Moeller Z-SCH230/25-40 Contactor Coil Voltage: Can I Use 24V DC to Test?

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#1 21675216 20 Jan 2016 12:01

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Anonymous

Post #1
21675216 20 Jan 2016 12:01

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Please I will like to ask a basic question about how to wire a Contactor.

I got this 4Pole contactor from EATON (Moeller (Eaton) Contactor modular 25-40 (Z-SCH230/25-40))

I have an AC load I want to use it to drive. Just to test if my contactor is working, I connected a 24V power supply to my A1 and A2 terminals of my Contactor.

I connected my 3 Phase AC to terminals 1 3 5 and I connected the load to the corresponding terminals 2 4 6.

The COntactor is a 4NO Contactor

Unfortunately I did not hear any switching so my load is not connected to the Supply after doing this.

My question is: Is it not possible to use a DC voltage source like 24 V supply to drive a contactor coil?

What could be wrong?

Thanks.

Please find the image below
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#2 21675217 20 Jan 2016 13:52

richard gabric richard gabric

Anonymous

Post #2
21675217 20 Jan 2016 13:52

Check the specs on the coil, I can't see the information on the side of the contactor in the picture, but the coils are usually AC, and the code for the part has 230 in it, which leads me to guess this is what it is. If that is the case, you may have to drive the coil from a relay if you want low voltage dc control.
Cheers,
Richard
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#3 21675218 20 Jan 2016 14:43

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Anonymous

Post #3
21675218 20 Jan 2016 14:43

Oh thanks so much, that is correct. The specicification on the relay says 230V ac
Now I will rewire it like this.

I will connect A1 termainal to the AC Main Live
And I will allow the second relay to be driven by a switch and a 24V DC supply.
I will make the small relay a NO and connect one of the legs of the output to the A1 of the contactor and the second to the Neutral of the AC supply.
The relay should close when the switch contact is closed and the 24v drives the coil of the small relay. When this happen the Neutral and my A1 should be connected and hence my load.

Please is my analysis correct?
#4 21675219 20 Jan 2016 15:56

richard gabric richard gabric

Anonymous

Post #4
21675219 20 Jan 2016 15:56

Should be wired up like this,
cheers,
Richard
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#5 21675220 20 Jan 2016 16:00

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Anonymous

Post #5
21675220 20 Jan 2016 16:00

Thank you very much. I will try it out tomorow
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#6 21675221 23 Jan 2016 16:06

Zachary Pick Zachary Pick

Anonymous

Post #6
21675221 23 Jan 2016 16:06

Is it not possible to just replace this contactor with one with a 24VDC coil?
#7 21675222 23 Jan 2016 17:05

richard gabric richard gabric

Anonymous

Post #7
21675222 23 Jan 2016 17:05

Yes, you can, but a relay probably works out cheaper than having to buy another contactor, unless he can do an exchange,
cheers,
Richard
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Topic summary

A user inquired about testing an Eaton Moeller Z-SCH230/25-40 4-pole contactor by applying 24V DC to its coil terminals (A1 and A2) while connecting a 3-phase AC load to the main terminals. The contactor did not actuate, prompting the question of whether a DC voltage source can drive the coil. Responses clarified that the coil is specified for 230V AC operation, and applying 24V DC directly will not energize it. A recommended solution is to use a low-voltage DC supply to control a separate auxiliary relay, which in turn switches the AC coil voltage of the contactor. Alternatively, replacing the contactor with a model having a 24V DC coil is possible but may be more costly than using an intermediate relay. The wiring approach involves connecting the contactor coil to the AC mains and controlling it via the relay energized by the 24V DC source.
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Eaton Moeller Z-SCH230/25-40 Contactor Coil Voltage: Can I Use 24V DC to Test?

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Topic summary