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Forum topic by bilyo posted 10-19-2018 09:49 PM 345 views 1 time favorited 9 replies Add to Favorites Watch
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bilyo

377 posts in 1272 days


10-19-2018 09:49 PM

I just bought a Shop Fox magnetic switch for my table saw. The switch is rated for 220-240 volts. My saw currently operates on 110-120 volts. I hooked it up and it works as long as I hold the switch on. Release the button and it goes off. I’m assuming that it requires 220-240 volts to stay on. Either that or the switch is defective. Any opinions?


9 replies so far

View Fresch's profile

Fresch

340 posts in 2091 days


#1 posted 10-19-2018 11:12 PM

Buy the 120volt switch.
It works when you hold the button in because (didn’t look up your switch) you are manually holding the magnetic part in, when you let go the coil won’t hold in because you need 240 volt would be my guess.

View lumbering_on's profile

lumbering_on

558 posts in 660 days


#2 posted 10-19-2018 11:17 PM

There’s a coil that closes the circuit, and 110V isn’t strong enough to allow it to do that.

edit: Fresch, I noticed that you responded while I was looking up the manual to double check the switch.

https://d27ewrs9ow50op.cloudfront.net/manuals/d4153_m.pdf

View bilyo's profile

bilyo

377 posts in 1272 days


#3 posted 10-20-2018 12:17 AM

Thanks for the verification. I guess I wasn’t too careful. I just assumed if was rated for 220 it would be OK for 110. That usually works. I’ll re-order one for 110v. Don’t want to re-wire the saw.

View MrUnix's profile

MrUnix

7001 posts in 2369 days


#4 posted 10-20-2018 12:21 AM

Which switch? Some can be made to work, others can’t. (ie: most 240v switches still just use 120v for the coil)

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View TheFridge's profile

TheFridge

10493 posts in 1656 days


#5 posted 10-20-2018 01:05 AM

If it comes on at all the cool is probably 120v. A 240v coil will chatter at best when power is applied if it works at all.

You might have to unscrew the starter from the enclosure to check coil voltage. Or look up the specs.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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bilyo

377 posts in 1272 days


#6 posted 10-20-2018 02:49 AM


Which switch? Some can be made to work, others can t. (ie: most 240v switches still just use 120v for the coil)

Cheers,
Brad

- MrUnix

This one.

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MrUnix

7001 posts in 2369 days


#7 posted 10-20-2018 03:56 AM

Ok, just as a long shot – which way did you have the hot/neutral hooked up? The coil should be connected to one side of the 240v only, so if you had that side wired as neutral, it wouldn’t work and would act like you describe. I did find this wiring diagram for 120v (same KJD17B contactor as you have) that might work.

If that doesn’t work wired like above, then you will probably need to return the one you got and get one designed for 120 (or 120/240).

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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bilyo

377 posts in 1272 days


#8 posted 10-20-2018 01:39 PM

Followed diagram above the 1st time and it didn’t work. On the chance I read it wrong (or what ever) I switched it side to side. Still didn’t work.

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bilyo

377 posts in 1272 days


#9 posted 10-22-2018 10:46 PM

Got the 120v switch today. It works just fine and all is right with the world ;>)
Thanks for the advice.

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