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-   -   Are "Magnetic Definite Contactors" same as relays (http://www.homebrewtalk.com/f170/magnetic-definite-contactors-same-relays-229548/)

terrazza 03-03-2011 07:29 PM

Are "Magnetic Definite Contactors" same as relays
 
I'm looking on Ebay for a 50 Amp DPDT Relay. I'm finding a bunch of 50 Amp Magnetic Definite Contactors that look a lot cheaper. Would they be interchangeable? Thanks

P-J 03-03-2011 09:21 PM

Link Please. That would help a lot.

Misplaced_Canuck 03-03-2011 09:30 PM

Looks like they're made for A/C units...

http://www.answers.com/topic/contactor

Walker 03-04-2011 12:15 AM

definite purpose contactors are nothing more than heavy duty relays. They are made specifically for switching large loads on and off.

I use one inside my control panel as a manual "OFF" switch for my 5500W element.

It is controlled by a 120V signal. I have a small switch on the front of the panel that passes 120V to the contactor's coil to activate it.

edit:
You wouldn't want to do a lot of switching with the thing, I wouldn't think. I don't think they are meant for high-usage. I flip mine on at the start of the brew session and then the PID controls the on/off of the heater element via SSR. When I want to absolutely turn the element off, I flip the contactor off.

terrazza 03-04-2011 05:31 PM

Quote:

Originally Posted by Walker (Post 2702062)
definite purpose contactors are nothing more than heavy duty relays. They are made specifically for switching large loads on and off.

I use one inside my control panel as a manual "OFF" switch for my 5500W element.

It is controlled by a 120V signal. I have a small switch on the front of the panel that passes 120V to the contactor's coil to activate it.

edit:
You wouldn't want to do a lot of switching with the thing, I wouldn't think. I don't think they are meant for high-usage. I flip mine on at the start of the brew session and then the PID controls the on/off of the heater element via SSR. When I want to absolutely turn the element off, I flip the contactor off.

Cool. They seem a lot cheaper than Relays of similar amperage too. I am planning on using it as the main on/off relay for my entire system. It won't have any more switching than just turning on / off my system.

Thanks for the information!

bruin_ale 03-04-2011 05:37 PM

That's the most common usage for the contactors. They aren't DPDT though, they're DPST (two poles, either on or off).

Walker 03-04-2011 05:59 PM

Quote:

Originally Posted by bruin_ale (Post 2704295)
That's the most common usage for the contactors. They aren't DPDT though, they're DPST (two poles, either on or off).

You can get DPDT contactors. One set of NC contacts and one set of NO contacts is how they are implemented... I think.

but, for an on/off switch, DPST is sufficient (and cheaper probably).

When I got mine, I was able to buy them on ebay for less than $7 shipped. Looks like they are going for more than that now.

fivehoursfree 03-04-2011 10:51 PM

Anyone have a link where one could find some of these?

bruin_ale 03-04-2011 11:51 PM

I think this is the one I have:
http://www.pioneerbreaker.com/ProductDetails.asp?ProductCode=CN-PBC302-120V


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