+ Reply to Thread
Page 1 of 2 12 LastLast
Results 1 to 10 of 13
  1. #1
    Join Date
    Jan 2010
    Location
    Northern Virginia
    Posts
    975

    Default Suggest a Relay please

    I need to be able to turn on a 120v 1/3 hp electric motor remotely via a low voltage reed switch. Is there an easy to connect relay unit with its own 12v power supply built in? And the coil would need to be continuous duty, as the reed switch is on/off not momentary contact.
    Tell me what I need to buy. Thanks.
    Casey
    Remove not the ancient landmark, which your fathers have set.

  2. #2
    Join Date
    Feb 2013
    Location
    The thumb, MI
    Posts
    54

    Default Re: Suggest a Relay please

    How about a remote-operated shop-vac relay? A small box plugs into a receptacle, the motor plugs into it & you activate it with a keyfob remote. Pretty cheap at ~$50 I think.

  3. #3
    Join Date
    Jan 2010
    Location
    Northern Virginia
    Posts
    975

    Default Re: Suggest a Relay please

    The reed switch is already installed. Fob not an appropriate application. But thanks for your response.
    Casey
    Remove not the ancient landmark, which your fathers have set.

  4. #4
    Join Date
    Jan 2008
    Posts
    1,093

    Default Re: Suggest a Relay please

    Quote Originally Posted by Sombreuil_mongrel View Post
    I need to be able to turn on a 120v 1/3 hp electric motor remotely via a low voltage reed switch. Is there an easy to connect relay unit with its own 12v power supply built in? And the coil would need to be continuous duty, as the reed switch is on/off not momentary contact.
    Tell me what I need to buy. Thanks.
    Casey
    Casey, your best bet would be to check with either a local electric motor rebuilder or a commercial electrical supply house. Lacking those a commercial HVAC outfit may be able to help- some of their stuff uses relays rated for this level. Before you set off, you need to know what amperage the reed switch is rated for so they can match that to the pull-down coil. If that rating is really low you may need an intermediate relay as well as the main one, or to go with a higher rated reed switch. If you know those ratings, some of the surplus electronics dealers 0nline might have something usable and cheap. If you get really stuck, message me and I'll try to dig a source up for you.

    Phil

  5. #5
    Join Date
    Jan 2010
    Location
    Northern Virginia
    Posts
    975

    Default Re: Suggest a Relay please

    That's a good idea; there is a motor shop in the next big town over. And the reed switch is rated at 20A so I think it's fine. I could also ask the previous owner what relay he used...
    Casey
    Remove not the ancient landmark, which your fathers have set.

  6. #6
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Suggest a Relay please

    Casey -- do you always want the motor to run whenever the reed switch is closed ?
    If so , with a 20 amp reed switch and 1/3 hp motor that reed switch should be good enough by itself. Just wire the reed switch in series with hot for the motor.

    Now , if you want to control the motor on/off when the reed switch is closed -- a 20 amp switch can be wired in series upstream of the reed switch.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  7. #7
    Join Date
    Jan 2010
    Location
    Northern Virginia
    Posts
    975

    Default Re: Suggest a Relay please

    Quote Originally Posted by canuk View Post
    Casey -- do you always want the motor to run whenever the reed switch is closed ?
    If so , with a 20 amp reed switch and 1/3 hp motor that reed switch should be good enough by itself. Just wire the reed switch in series with hot for the motor.

    Now , if you want to control the motor on/off when the reed switch is closed -- a 20 amp switch can be wired in series upstream of the reed switch.
    Hi,
    Yes that would work, but I do not want to run a 120v wire inside the organ console. I'm wiring a blower motor for a chamber organ.
    Casey
    Remove not the ancient landmark, which your fathers have set.

  8. #8
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Suggest a Relay please

    If that's the case then use a 6 - or 12 volt ac/dc adaptor ( 300 ma is plenty ) and pick up an Omron LY1 relay. They come in 6 or 12 volt dc coil and switch 120 volt 10 amp.

    I've used the Omron relays in industrial controls and they are pretty reliable and reasonably priced -- around $12.
    You may even have a wall-wort kicking around from an old electronic device -- answering machine , cordless phone , etc.
    Last edited by canuk; 02-25-2013 at 09:53 AM.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  9. #9
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Suggest a Relay please

    You probably know how to wire everything , but , just in case.

    "" an ounce of perception -- a pound of obscure "
    - Rush

  10. #10
    Join Date
    Jan 2010
    Location
    Northern Virginia
    Posts
    975

    Default Re: Suggest a Relay please

    Thanks everybody. I'm now idiot-proofed! Onward.
    Casey
    Remove not the ancient landmark, which your fathers have set.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •