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Magnetek ATS-100 transfer switch

July 16, 2019, 06:28:48 pm

Since I bought the coach last year the 2nd transfer switch (that powers sub-panel from inverter or shore power) would take 5 minutes to turn on.  Last week it quit working so I had no power to either the microwave or receptacles.  And since we're only halfway into our Alaska trip I needed to get power back to the microwave and receptacles.  I first disconnected the wires from the main panel, then jumpered across the relay from the inverter power.  Since my Prosine 2500 has a built-in pass-through (transfer switch) rated at 20 amps I now have power to the receptacles and microwave.  I'll just have to limit power usage on the receptacles until I can fix the transfer switch or replace it.
Question:  is it ok to run like this for a couple more months?
Since these are obsolete are any parts available?

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Re: Magnetek ATS-100 transfer switch

Reply #1 – July 16, 2019, 09:04:33 pm

Maybe some options here. Replace ATS100 110v? Lost all AC power. Replace/Fix? automatic power switch

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Re: Magnetek ATS-100 transfer switch

Reply #2 – July 16, 2019, 10:06:51 pm

If you are asking if it is OK to wire like this-- YES.

Main breaker box to inverter/charger 120 VAC IN

120 VAC OUT from inverter/charger directly to sub-panel (instead of inverter OUT to ATS, then ATS OUT to sub-panel).

Just turn off breaker from main panel to second ATS or just isolate wires. This last step not electrically needed, but if the ATS has failed, it just insures that it can't fail further/cause a fire, etc.

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Re: Magnetek ATS-100 transfer switch

Reply #3 – July 16, 2019, 10:16:58 pm

Thanks Roger and Brett.  Not being familiar with the wiring on my FT I wanted another opinion that jumping across the relay and disconnecting the other relay was ok.  I'll look at it further when we get back.

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Re: Magnetek ATS-100 transfer switch

Reply #4 – July 16, 2019, 10:17:10 pm

Folivier, Since you are inside the transfer switch, try filing the points. New point sets are available, but other parts are not likely available. There is a timer on one relay coil, that could be bypassed. Measure voltage at different places to identify problem. The ATS is durable and a good switch. Some have also mechanically press relay closed. You could temporarily hardwire the main panel if you don't need inverter power.

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Re: Magnetek ATS-100 transfer switch

Reply #5 – July 22, 2019, 10:13:45 pm

Check the bridge rectifier with your ohm meter. I tested mine and it was open. it should show resistance in one direction, and none when the leads are reversed.....if the readings are equal the diode is open. New bridge rectifier under $5.00. Easy to replace, four wires... The rectifier is basically four diodes in a neat block, two wires go to ac , the other two is is Dc voltage... you can find it on the internet if you type in your model number ...ATS and number..
Safe travels
Dave

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Re: Magnetek ATS-100 transfer switch

Reply #6 – July 22, 2019, 10:25:35 pm

Bridge rectifier, black rectangle on right side of photo.

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Re: Magnetek ATS-100 transfer switch

Reply #7 – July 22, 2019, 10:38:36 pm

Thanks Dave.  I'll pull it out when I get home in October and work on it.  Right now everything is working ok with it bypassed.  Microwave, oven, hair dryer, etc. all ok.

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Re: Magnetek ATS-100 transfer switch

Reply #8 – July 23, 2019, 11:51:49 am

Part number for bridge rectifier
RS207L

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Re: Magnetek ATS-100 transfer switch

Reply #9 – July 23, 2019, 03:02:48 pm

Part number for bridge rectifier
RS207L

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Re: Magnetek ATS-100 transfer switch

Reply #10 – April 08, 2024, 04:05:26 pm

I know this is an old post but is the progressive dynamics PD 52V a direct plug and play replacement for the magnetic ats-100? I require replacing the inverter transfer switch and this seems to be the most recent. I want to be able to just swap wires

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Re: Magnetek ATS-100 transfer switch

Reply #11 – April 08, 2024, 06:51:16 pm

I believe it is a direct replacement.  I opted for the pd52dcs version because it produces less of a humming noise.  It was a tad bigger but did fit using the same wires. Some discussion in the thread below

Silent transfer switch?

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Re: Magnetek ATS-100 transfer switch

Reply #12 – April 11, 2025, 01:24:21 pm

Dave do you know what would prevent the generator from powering the motorhome that's inside the switch? The reason I ask is it was working fine with the generator on and powering the motorhome but I think I shut the air conditioner down incorrectly and it just stopped giving power to the motorhome. I don't know if that's a coincidence or I did something.

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Re: Magnetek ATS-100 transfer switch

Reply #13 – April 11, 2025, 01:43:14 pm

Did you check the breaker on the generator?

After that, are you comfortable around electrical?  If not, it can kill you if you touch the wrong spots.

With a vom meter needs to check if generator is putting out power and if making it to the transfer switch

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Re: Magnetek ATS-100 transfer switch

Reply #14 – April 11, 2025, 08:08:26 pm

Joe, what coach do you have? Put the coach information in your profile and you will get better information, because over the years many changes were made.

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