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post #1 of 6 (permalink) Old 02-18-2009, 08:44 AM Thread Starter
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Default Electronic toggle switch question

I need to replace a switch that went bad and know little to nothing about about the specs. The old switch has 2 HP, 15/20A 125V. I picked up what I though is a replacement switch at the borg which has 3/4 HP, 15A 125V. Will this work if the device I am applying it to has a 3/4 HP motor and runs on a 15 amp household circuit?

Thanks for any words of wisdom before I fry myself
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post #2 of 6 (permalink) Old 02-18-2009, 09:11 AM
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Hello Bob! This is what i would guess. the switch designed for the 20 A. motor will be a little heaver to take the heat generated when you through the switch. therefore, the 15 A. will fail quicker. If that switch gets hotter in normal use, replace it with the 20 A. switch. I am not an expert at all, however . other replies may tell you i am wrong.

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post #3 of 6 (permalink) Old 02-18-2009, 09:32 AM
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HI Bob

Most of the " 2 HP " switches are 3 times as big as the normal switch, that's good tip off,,,,,they must be hvy.duty....I'm not sure if the HD/Lowes has them but a good elec.store outlet will have or a motor repair shop will also have them..

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I need to replace a switch that went bad and know little to nothing about about the specs. The old switch has 2 HP, 15/20A 125V. I picked up what I though is a replacement switch at the borg which has 3/4 HP, 15A 125V. Will this work if the device I am applying it to has a 3/4 HP motor and runs on a 15 amp household circuit?

Thanks for any words of wisdom before I fry myself



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post #4 of 6 (permalink) Old 02-18-2009, 10:18 AM
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Thumbs up Summation: It would work.

Quote:
Originally Posted by Bob View Post
I need to replace a switch that went bad and know little to nothing about about the specs. The old switch has 2 HP, 15/20A 125V. I picked up what I though is a replacement switch at the borg which has 3/4 HP, 15A 125V. Will this work if the device I am applying it to has a 3/4 HP motor and runs on a 15 amp household circuit?

Thanks for any words of wisdom before I fry myself
You want fries with that?



If: (Amps)= 15 and (Volts)=120 then

Amps x Volts =1800 Watts

1800 Watts x .00134 = 2.412 horsepower

Summation: It would work.

Cordially,
Gerry
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post #5 of 6 (permalink) Old 02-18-2009, 10:42 AM Thread Starter
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You guys are Great! I think I'll go ahead and try the replacement as it is the same size as the bad switch and Gerry's formula looks good, fries and all

Mucho Thanks!
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post #6 of 6 (permalink) Old 02-18-2009, 10:54 AM
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Bob,
there's a misunderstanding that I have with switches.

When they are imprinted with " 3/4 " does it actually mean three quarter?
Or does it actually mean three to four?
I ask this because some also have the imprint 110/120 and if one does the math, that's 1.0909090909090909090909090909091 volts or even 120/240 and that would equal 2.0 volts!
LOL

Cordially,
Gerry

Last edited by Gerard_sr; 02-18-2009 at 12:51 PM.
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