3 phase motor starter

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nickelec

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Can anyone recommend a good starter
I need a starter 3 phase 30a max with hand off auto switch built in 120 v coil

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Door is wide open for many possibilities with no more specifications than you give.

some key things -

supply volts
control volts - you did mention 120 volt coil, do we need to transform a control voltage from the supply volts or do you have separate control voltage source already?

Presuming since you called it a "starter" you will need motor overload protection incorporated into it - next comes what is motor current in order to make sure your overload will have settings within correct range and whether you need class 10, class 20, class 30 protection. Do you want one that has enhanced phase loss protection? Melting alloy, bimetallic, electronic?

Is there already a branch circuit supplying this, is it within site of the branch circuit device or other disconnecting means, or will you need maybe a combination starter with fused switch or breaker within it?

Then comes enclosure type necessary - NEMA 1, 3R, 4, 4X, 12, 13...
 
So it's a standard 3 phase 208 motor for a circulating water the 120v control source will be coming from some where else

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Was thinking something like thsi these are the motors I need to wire up IMG_6835.jpgIMG_6836.jpgIMG_6837.jpgIMG_6839.jpg

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Pictures are too small for me. You initially said 30 amps in OP. I see at least one of your motors looks like 1.5 HP and one looks like 5 HP, can't tell the others.

@ 208 volts your 1.5 HP motor can be on a NEMA size 0 starter, the 5 HP would need to be on a size 1 starter. If you have a 10 HP it would need to be a size 2. There can be significant cost difference between a size 0 and size 2 NEMA starter.

Some IEC contactors out there won't be nearly as much cost difference for one that can handle 10 Hp vs one that can handle 1.5 Hp.
 
Sorry I was in the middle of something when writing this
So I was tasked with providing the power conduit and starters for these 4 motors controls by others. I was told to just provide a 120 v coil for the boiler tech to hook up to
So I just need to spec starters for these 4 motors with a hand auto off selector switch
The motors are as follows
3 phase 208 5 hp
3 phase 208 5 hp
3 phase 208 2 hp
3 phase 208 1.5 hp

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I like pump panels even though they’re 3R. You have Disconnect, controller, HOA and overloads all in one package. Put a N/O contact in series with the Auto control. Supply a small easily replaceable relay with a 120 volt coil for the control techs and you’re done.

eta: I’m slow...
 
ptonsparky said:
I like pump panels even though they’re 3R. You have Disconnect, controller, HOA and overloads all in one package. Put a N/O contact in series with the Auto control. Supply a small easily replaceable relay with a 120 volt coil for the control techs and you’re done.
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i agree with you guys its the easiest way to go thank you all!
 
Just a word of caution. Red paint on pumps is often used to signify that they are associated with the fire fighting /suppression system. If so, there are an entirely different set of standards and code sections that must be followed, including the motor starter.
 
Jraef said:
Just a word of caution. Red paint on pumps is often used to signify that they are associated with the fire fighting /suppression system. If so, there are an entirely different set of standards and code sections that must be followed, including the motor starter.
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I've seen many boiler pumps that are red. They are not "fire pump motors" either, those are probably more expensive.
 
I was surprised to see that one of the motors is a Brook Crompton, a very old UK (Yorkshire) company.

Every UK electrical apprentice was given a little red pocket book, the BC motor bible. Mine dates from 1968.
 
Tony S said:
I was surprised to see that one of the motors is a Brook Crompton, a very old UK (Yorkshire) company.

Every UK electrical apprentice was given a little red pocket book, the BC motor bible. Mine dates from 1968.
Click to expand...

Brook Crompton made a big push here in the US during the 90s and had some success with a few large national distribution chains.
 
nickelec said:
Sorry I forget to add 208 voltage

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Can't you get a 208V coil?

For us here in UK, three phase LV is 400V and we would use a 400V coil. If additional control gear is required we may go 110Vac.
I like simple.
 
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