Potter & Brumfield Magnetic Switch?

Most Mag switches run on 110/120 volts even if you are using 240. Even my 3 phase equipment that has mag starters are only on a 110 leg. There should be a wiring diagram inside the cover, to tell you how to wire it,

That looks like a garden variety 4 pole double throw relay. Look at Digikey, Newark etc and see if you can match it up. Plan B would be to put a resistor in series with the coil. You would need to know the impedance of the one you have and get a resistor the same size. (~3k ohms at 10W?) Potter Brumfield is Tyco now.

You're going to need some adult supervision on this. As in other messages, the coil has to be 120V if the tool was running on 120V before. You have to be sure you are switching both hot leads and that the coil runs from one hot to neutral.

I don't think you need a fourth wire, but code may ask for it. It's up to you. Mine are all on 3 wire plugs.

I think talking you through this is more trouble than it's worth, unless you find and can understand the schematic. Someone knowledgeable can do it in five minutes. Don't you have any electrically oriented friends??

The magnetic switch is also called a relay. I'm sure you can find a description through google, but not an exact schematic.

Be careful!

I have identified the part as a PM-17AY-120. The manufacturer suggests replacing it with a PM-17AY-240 for $90. That is a little out of my budget.

I haven't managed a schematic on it, but this is a catalog page on it.

Any chance of making this work? Any way to get the schematic?

Thanks.

Read the coil data chart. It says to use a 2700 to 3300 5w resistor in series with the coil. (for 220v operation) Is there an echo in here ;-)

From the other comments you have received about following the connection instructions from the manufacturer of the saw that resistor may already be there somewhere.

I read it that way the first time also, but I am pretty sure the resistor is to change 120vdc to 220vdc. I would like to be wrong about this, but that's how it looks to me. I expect a resistor is less than $90! Do you think they mean 120vac to 220vac??!

It means you can hook the 120v relay to 240v with a resistor in series with the coil. If I understand the original question you were converting a 120v saw to

240v. This is how you deal with the extra 120v at the relay. You will also have to re-tap the motor. As another poster suggewsted, the resistor might already be there. Have you checked with the manufacturer for the procedure? They may have a web site.