Is this motor starter appropriate for this motor

[stav]

I bought a Belsaw planer that has a 3hp Marathon motor. The previous owner had it wired 220 with a 20 amp plug so I'm guessing that is how he ran it. My 220 is 30 amp so I was looking up the starter to see if it would be ok. The starter is a Square D Class 2510 Type KO-1 HU. I found the manual online and it says this starter is only rated for a 2hp motor on 220. So, I guess I'll be looking for a new one. I was wondering what the result would be of pairing a starter with a motor for which it is not rated. Would it just be on the brink of failure every time the motor is running? Is there any potential damage to the motor that I need to look out for?

<img src= 'http://i271.photobucket.com/albums/jj138/rdfish/FullSizeRender-1_zpsxsufegfs.jpg'> <img src= 'http://i271.photobucket.com/albums/jj138/rdfish/FullSizeRender_zps4ddbcuoe.jpg'>

I would rather not go to a mag starter, I don't really want to spend that much if not necessary.

[BloomingtonMike]

HP rating of most contactors is rated 3phase 220v which is one half the amperage of single phase 220v so use the amp rating of the contactor at 220v when sizing it.

[Rick F]

That Square D 2510 - KO appears to be a simple switch.    Its rated for 2hp motors ..  220V .  

Delta put those on planers,  I thought it was aweful . One of my buddies overloaded and burned out a 2hp motor on his Delta Planer.  When I looked at it .. it was just a switch ..   no overload..  nothing.  

The motor probably has a thermal overload on it .. which is meh . . 


Either way, the switch is not rated for 3hp .. and the motor is 16 amps @220V .. so its in the 3hp range.   So the switch is likely too small. 

I would want a proper started with an overload.  Grizzly sells them cheap .. l  I cant remember but something tells me $60 ..

[Bob Vaughan]

"Ratings" for motor controls vary depending on the seller.  NEMA ratings are reliable.  Asian switch ratings are a joke no matter how comforting the printed numbers may be.
You want your contacts to not be a constriction point of current flow when the motor starts and stops.  With minuscule contacts, flow is constricted significantly.

below is one of many examples I could give.  The top set of contacts are from a NEMA size 1 starter rated for 28 amps.  The lower set of contacts came from a Asian switch "rated" for 30 amps.  The label asks the owner not to open the switch.  Can't imagine why.   Its your money and its your motor.

[thewizzard]

The motor's rating is 16 A at 230 V. If you plan on pushing it to the max, you will need a complete circuit that is rated at >= 16A/230V. If you only do light work, you may never draw more than 5A.

If it ran for the original owner "as is", give it a try unless you already know you are going to fully load the motor. If the starter poofs-out replace it with bigger unit with 16A overload cut-out unless the motor has built-in protection. Then I'd go to a 20A cut-off.

Your 30A feed is fine.

[stav]

I don't plan to fully load the planet, but I also don't want the expense of trying to replace a motor this large. I been looking on eBay to see what is available after reading the starter wiki on the vintage machinery site. So far, nothing is jumping out at me, but I have to admit that I don't quite feel that I'm fully versed in motorology just yet. Maybe a few more times through the wiki.

[EvilTwin]

Bob is the guru on the OWWM.org site,  what he is telling you is gospel.  If you cant find a starter on Ebay, you can post a WTB ad either here or over on OWWM.org in the BOYD section.   I've sold a couple of older mag starters there over the years,  for some reason when you go through old machinery you seem to collect a few extras.   Either way, you should be able to find one for probably less than what they want for one of the far east versions go for.  You may have to change the heaters in it, they are what limit the current it will switch and are sized for the load it switches. Good Luck.