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Topic:
Wiring an electrical contactor?
This thread has 28 replies. Displaying posts 1 through 15.
Post 1 made on Monday February 10, 2014 at 09:46
Hertz
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657
Gotta wire up a 110 electrical contactor for a project.

However I can't find a explication for the terminals?

I have the following terminals:

A1
A2
L1
L2
T1
T2

Any one who's done one before kind enough to let me know what terminal is what?

Google and YouTube have provided explanations as to how they work, but can't get an answer as to actual terminal explanations.

Also the counter guys at the electrical supply where clueless as well.

Thanks ahead of time.
Post 2 made on Monday February 10, 2014 at 10:04
Audiophiliac
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3,311
HAHA....must be early. Am I the only one who read this as "I need to wire up an electrical contRactor"? :P

Like the counter guy, consider me clueless.
"When I eat, it is the food that is scared." - Ron Swanson
Post 3 made on Monday February 10, 2014 at 10:09
highfigh
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On February 10, 2014 at 10:04, Audiophiliac said...
HAHA....must be early. Am I the only one who read this as "I need to wire up an electrical contRactor"? :P

Like the counter guy, consider me clueless.

Wishful thinking- I read it the same way, at first.
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."
Post 4 made on Monday February 10, 2014 at 10:16
sbacon99
Long Time Member
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79
Suggest looking up the diagram for the specific manufacturer/part, but from a Google this looks like the common scheme:
A1/A2 Control coil (voltage across these 2 activates contactor)
L1/L2 Line side (power in)
T1/T2 Load side (power out)

Hope this helps
Skip
OP | Post 5 made on Monday February 10, 2014 at 11:16
Hertz
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On February 10, 2014 at 10:16, sbacon99 said...
Suggest looking up the diagram for the specific manufacturer/part, but from a Google this looks like the common scheme:
A1/A2 Control coil (voltage across these 2 activates contactor)
L1/L2 Line side (power in)
T1/T2 Load side (power out)

Hope this helps
Skip

That's what I figured.

Can find any info on this part.

Thanks.
Post 6 made on Monday February 10, 2014 at 12:04
Ernie Gilman
Yes, That Ernie!
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30,104
And by "this part" you mean... [this is where you put the brand and other information, no matter how sketchy, in the post].

You seem to know that it's got a 110VAC coil, but I'm assuming. Test for that: measure resistance across terminals, and when you find resistance other than zero or infinity, you're across the coil. Apply 110 VAC to those two terminals. If the contactor smokes or flames, the coil wanted less voltage; you've now destroyed it and you can follow the next approach below. If the relay snaps, it's probably a 110VAC coil. If it doesn't snap, it's probably meant to use a higher voltage.

if it does close, measure resistance across the other terminals while it's closed. Compare with resistances you got with the coil not energized. This will tell you what connects to what when the coil is energized.

The next approach is to call Grainger, tell them what you're trying to do and what the voltages and currents are, and have them specify a part. They will be able to spec a part because the part they spec has written specifications, so you'll instantly have the data you need to connect the new model.

What is so golden about the one oddball contactor that you already have that makes it necessary to use just that one? What will you do if this works and you have to make a second one? Or if it doesn't and you have to make a second one? Since you don't have specs on it, how do you know it has a 110V coil?

Also, studying specs for other contactors should show a pattern as to what A, L and T mean.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
OP | Post 7 made on Monday February 10, 2014 at 13:02
Hertz
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I know it's 110 because it's what I asked for.

I've already done testing to see what's connected when the coil closes.

Just wanted to follow the proper wiring specs.

This part is an EATON C25BNB230A.

I understand This is something basic for electricians but to not include a wiring diagram or at least a schematic on the part itself is annoying.
Post 8 made on Monday February 10, 2014 at 13:40
fcwilt
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JOOC did you Google that part number - it took me about 5 seconds to locate the datasheet for it.
Regards, Frederick C. Wilt
OP | Post 9 made on Monday February 10, 2014 at 13:43
Hertz
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On February 10, 2014 at 13:40, fcwilt said...
JOOC did you Google that part number - it took me about 5 seconds to locate the datasheet for it.

I googled the number. Got a big ass document with general info about their contacts. Don't recal actual labels on the terminals though, might of missed it in my rush.

Got the info I needed. Thanks folks.
Post 10 made on Tuesday February 11, 2014 at 00:11
Ernie Gilman
Yes, That Ernie!
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You're right -- the docs have no definition of the terminal labels. I've seen L used for line. Of course, it might mean load. And what's the sense behind T meaning load? Or line?

I'd look at the relay and wire the line to the set of terminals closer to the base, that is, further from any prying fingers; that's only if the physical construction makes that possible.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 11 made on Tuesday February 11, 2014 at 00:32
Mario
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The item doesn't have something similar to this Cutler-Hammer diagram on it?

Post 12 made on Tuesday February 11, 2014 at 02:39
Ernie Gilman
Yes, That Ernie!
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30,104
Mario, that identifies things if you already know what the designations mean. That's the problem!
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 13 made on Tuesday February 11, 2014 at 05:29
fcwilt
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True but if you search "markings on contactor" you will quickly find any number of sources on what means what.

But then if you don't know what they mean maybe you shouldn't be the one putting it in?
Regards, Frederick C. Wilt
Post 14 made on Tuesday February 11, 2014 at 07:01
Munson
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Is this for customer? If so I would go back to this sites old saying, hire a pro!
OP | Post 15 made on Tuesday February 11, 2014 at 11:27
Hertz
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Everybody has to learn at one point right?

It's basically a relay with different markings. Different labels so I wanted to be sure.

Found out the T is for TAP. L is line but no idea why A is the coil.
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