Can I use this 3 phase switch for single phase motor?

[apittmanii]

Hello, I am replacing a 3 phase motor for a single phase 115 V motor and want to know if this Cutler Hammer switch will run my single phase motor:

The 3 phase switch I’d like to keep using says (see photo):

MAX
1-1/2 H.P. 115V. 3PH.
2 H.P. 230/575V. 3PH

Will this switch run either of these single phase 115v motors? I can install either of these. I only have access to 115 volt power.

Option 1:
1/2 H.P.
8 Amps

Option 2:
3/4 H.P
FLA 10.8 Amps
SFA 12.4 Amps

Option 3:
Don’t use the switch for single phase motor.

Thank you in advance

 

[wyliesdiesels]

odd switch rating. there is no such thing as 115v 3Ø

I suspect its a typo.

does the switch have a P/N somewhere

and typically the 3Ø rating will be close to double the single Ø rating.... but not always

 

[BrandonV]

odd switch rating. there is no such thing as 115v 3Ø

I suspect its a typo.

does the switch have a P/N somewhere

and typically the 3Ø rating will be close to double the single Ø rating.... but not always

Might be a part rated for a marine or aviation power system.

Very interesting for sure.

 

[micromind]

Edited.....see post #6 below.

 

[apittmanii]

Here is the exact switch. It’s to a vintage causing 15 inch drill press.

Clausing 15'' Model 16ST DP Cuttler Hammer 1 Phase or 3 Phase Push Button Switch | eBay

Find many great new & used options and get the best deals for Clausing 15'' Model 16ST DP Cuttler Hammer 1 Phase or 3 Phase Push Button Switch at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[micromind]

That switch doesn't have overloads, it'll easily run the 3/4HP 10.8 amp single phase motor.

 

[apittmanii]

Thanks very much for the feedback.

 

[Norcal]

I would say it will be fine, those Cutler-Hammer art deco switches go for some decent money, BTW.

 

[johnre]

For less than $45 you can get a proper single phase 120 V switch rated for this HP. And they are made in this format (push-start, push-stop).

 

[BreeStephany]

As others have said, any 3ph switch can switch a 120V load as long as the motors amperage rating is within the rating of the switch. Because 3ph current on motors than that of a 120V motor with an equal horsepower rating, you want to ensure that the amperage rating of the switch meets/exceeds that of the load.

Do keep in mind, that you will just need to utilize 1 contact instead of 3 and not switch the neutral / grounded conductor of the motor.

I imagine that is a remote switch with power coming in & out from another junction, so all you need to do is cap the unused switch legs at the junction where power comes in and out.

Just my two cents.

 

[PopcornSutton]

The photo 2356 looks like a typical magnetic starter switch. It would have 3 contacts, the switch won't know all 3 aren't used.

 

[Norcal]

The photo 2356 looks like a typical magnetic starter switch. It would have 3 contacts, the switch won't know all 3 aren't used.

They were made in different versions, one as a maintained motor starting switch like the OP's, & as a control station to be used with a mag starter, which has less guarding around the buttons then a maintained one.

 

[tool_scrounge]

Ignoring power factor and efficiency:
Power output single phase motors:
P=V*I
Power output for 3 phase motors
P=1.71*V*I

So if the switch is rated for 3Hp 3 phase, the single phase max power rating is 3/1.71 =1.754 Hp.
It should be fine for a 1.5Hp motor.

 

[wyliesdiesels]

Might be a part rated for a marine or aviation power system.

Very interesting for sure.

Is there 115v 3Ø in marine or aviation?

 

[micromind]

Most big planes have a 115 volt 3Ø 400 HZ AC system.

Not 115/200 but 115 only.

 

[BrandonV]

Most big planes have a 115 volt 3Ø 400 HZ AC system.

Not 115/200 but 115 only.

Yup. The AH-1 Cobra IIRC has both 115 VAC 3Ø wye & delta power.

 

[BrandonV]

Back in the day (not sure about today) the Navy was big on 115 VAC 3Ø too.