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nielsent
Joined: 09 Dec 2015 Posts: 13 Location: Newfoundland, Canada
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Link Posted: Wed Feb 24, 2016 3:19 pm Post subject: contactor voltage question |
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So I'm working on getting parts for the next portion of my controller build and I found these contactors at my local princessauto (harbour frieght for canadians).
http://www.princessauto.com/en/detail/2-pole-24vac-definite-purpose-contactor/A-p8583999e
I have done some research on them and they seem like they might work, but it keeps saying 24VAC, and when I look at stuff online and in stores it seems like 24VAC and 240VAC are used somewhat interchangably, I don't want to waste money or risk injury so if there is someone on this forum that could potentially explain this to me It'd be most appreciated.
Regards,
nielsent.
_________________ Build a man a Fire, He'll be warm for a day...
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11121 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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Link Posted: Wed Feb 24, 2016 3:27 pm Post subject: |
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There are two voltages:
(1) The voltage that the switches can handle - you need this to be at least 240V AC if you are following our design(s). Most will be able to handle at least 240V AC, with 277V AC and 300V AC being other common values.
(2) The coil voltage the is used to activate the switches - this needs to be 120V AC if you are following our design(s). 240V AC can also work if you redesign slightly. You could technically use a contactor with a 24V AC coil too but you'd need to first use a 10:1 stepdown transformer to go from 240V to 24V or a 5:1 stepdown to go from 120 to 24V. Getting the right contactor with a 120V coil is obviously preferred.
When they say 24V AC, they most likely mean the coil voltage as having contactor switches rated to only switch 24V AC doesn't make much sense.
FWIW, I'd be careful with anything electrical from Princess Auto. They sell a lot of scary junk (as far as electrical is concerned). I did look there when doing my own build and decided against using any of their electrical stuff, especially anything high power.
Kal
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