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DIN rail resistors

  • 13-12-2012 8:52am
    #1
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭


    Does anyone know where I could get DIN rail mounted power resistors, looking for something around 0.5 ohms that can handle 100w. I know these are some times used in motor braking circuits.


Comments

  • #2
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,641 Mod ✭✭✭✭2011


    What voltage are the resistors to operate at?


  • #3
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    2011 wrote: »
    What voltage are the resistors to operate at?

    That shouldn`t really be a factor at 0.5 ohms. Rated to carry 14 amps by the look of it probably.


  • #4
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    What about 10 x 5 ohm 10 watt resistors in parallel? Too messy probably?

    Could install them in a row of 3 or 4 din rail connectors possibly, and wired out to a separate enclosure.


  • #5
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    2011 wrote: »
    What voltage are the resistors to operate at?

    There'll be 220V AC going through them. The will only receive pulses of power, but will probably rate them for continuous operation.


  • #6
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    robbie7730 wrote: »
    What about 10 x 5 ohm 10 watt resistors in parallel? Too messy probably?

    Could install them in a row of 3 or 4 din rail connectors possibly, and wired out to a separate enclosure.

    Was hoping for something I could just clip on and screw two 4sq cables to, like a big fuse holder.


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  • #7
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    DublinDilbert wrote: »
    There'll be 220V AC going through them. The will only receive pulses of power, but will probably rate them for continuous operation.

    The voltage wont really be a factor. Them resistors at full capacity will have 7 volts dropped across them regardless of the supply voltage.


  • #8
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    DublinDilbert wrote: »
    Was hoping for something I could just clip on and screw two 4sq cables to, like a big fuse holder.

    It would probably be a fairly hefty resistor anyway, even if available at them specs.


  • #9
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,641 Mod ✭✭✭✭2011


    DublinDilbert wrote: »
    Was hoping for something I could just clip on and screw two 4sq cables to, like a big fuse holder.

    Perhaps you could get your hands on some of the rewireable fuses that they used to use in the UK ?


  • #10
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,641 Mod ✭✭✭✭2011


    robbie7730 wrote: »
    That shouldn`t really be a factor at 0.5 ohms. Rated to carry 14 amps by the look of it probably.

    That would depend on what I was going to suggest.


  • #11
    deandean
    Registered Users, Registered Users 2 Posts: 2,256 ✭✭✭deandean


    For that rating you need proper wirewound power dump resistors.

    I had a few made up several years ago by a UK company, they weren't too expensive but they took a couple of weeks.

    Google 'braking resistor'. If you're lucky you'll find one off the shelf although the resietance you're looking for is low.

    And, one tip from me: if you want long term reliability, DOUBLE the power rating. e.g. if you're gonna dissipate 100W, go for a 200W rated unit (with due allowances for intermittant usage).

    Here is one crowd - I just looked them up
    http://www.reo.co.uk/shop/product_list.php?id=11


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