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Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?


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Old 07-13-2013, 08:52:10 PM
jefffurness jefffurness is offline
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Default Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

I posted about a EM 40 Onan my father and I have. We had it coverted to single phase 120/240 so the three phase switch we have won't work when we set it up. Can the switch I have be converted to single phase 120/240?
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Old 07-13-2013, 09:34:38 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

It could be but you will have to change some of the 208 relays.
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Old 07-14-2013, 12:15:05 AM
Gunny Gunny is offline
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

Yes but......

You would be changing some of the relays, if you can find them. Onan no longer provides support or carries repair parts for that switch.

In it's day, that switch was the best available. Compared to today's product, not so much.

If it were me, I'd consider a manually operated switch, far less expensive and not likely to malfunction or get damaged by lightning. If you do need an automatic, look at ASCO or TTI (Thompson Technology).

Consider selling your existing switch as parts on ebay. Probably greatly off set the cost of a new switch. Most of the parts inside are no longer easily available. For instance, the main contactor.
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Old 07-14-2013, 12:41:11 AM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

The transfer pilot relay. Is no longer in the system. Last one I converted. Relays and labor was over 1500.00 dollars.
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Old 07-14-2013, 07:33:14 AM
Wayne 440 Wayne 440 is offline
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

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Originally Posted by Billy J Shafer View Post
The transfer pilot relay. Is no longer in the system. Last one I converted. Relays and labor was over 1500.00 dollars.
+1 for a manual switch. It is hard to beat a big old manual (such as Square D) switch that makes a satisfying "clunk" when you pull the handle. They are not the least expensive brand, but such a switch may last 50 years, and there is not much short of a direct lightning strike or significant external physical damage that will break it.

If you want an automatic, a quick Google seach reveals that a new residential grade 200A automatic switch, such as an ASCO 185 can be had for well under $1500.
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Old 07-14-2013, 08:24:53 AM
sdowney717 sdowney717 is offline
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

At what voltage are the pull in coils rated? 208 vac?

If you have 240 vac, and have 208 vac coils they would work but maybe overheat. What about a blocking resistor to drop the 240 to 208 vac to run the coils?
This is they way I think, I try to determine how it functions and see if I can make it work.
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Old 07-14-2013, 10:46:52 AM
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

Good ideas. But that is a 1972 switch. Most of the parts on the swing out door. Can be replaced. But if anything on the contactor goes out. You can trash it. I tried to buy a interlock coil twenty years ago. No longer in the system.

Be much better off buying a new switch.
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Old 07-14-2013, 02:55:56 PM
Richard L Richard L is offline
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

I converted a LTU 3 phase to 120/240. What I found is that most of the controls operated off of 120/240,you just had to figure what contacts went where. If I remember correctly, I had to change some jumpers on the transformer that was used in the control system.
I just picked up a OTPC 125 a switch for $50.00 on Ebay that is a newer switch,you might try ERIC at GOLAND 610-658-3242 and see what he has,as he was the person who had this on E bay
R
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Old 07-14-2013, 08:03:01 PM
jefffurness jefffurness is offline
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

Thank you everyone. This forum is great!
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Old 07-14-2013, 08:31:52 PM
Daverepair Daverepair is online now
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

I have the inner panel to a LTD, I think, switch that may have a relay or two on it @240 vac. I will check it out and if so you are welcome to it for the price of shipping.Do you have a manual or wiring diagram for your switch
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Old 07-15-2013, 04:05:31 PM
jefffurness jefffurness is offline
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

No manual. Thanks for the offer.
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Old 07-15-2013, 05:40:13 PM
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

Post an email and we will get you a manual.
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Old 07-16-2013, 03:09:28 PM
jefffurness jefffurness is offline
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Default Re: Onan 200amp 3 Phase 120/208 transfer switch. Can it be converted to single phase?

jefffurness@hotmail.com. Thank you!
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