Author Topic: 5V logic to energize 220v contactor?  (Read 2495 times)

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Offline tekati

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5V logic to energize 220v contactor?
« on: May 27, 2015, 01:55:09 am »
Would this be as simple as using a TRIAC?  I could use a relay to turn on the contactor but that is just another mechanical point of failure.
 

Offline N2IXK

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Re: 5V logic to energize 220v contactor?
« Reply #1 on: May 27, 2015, 02:09:58 am »
I would use a small solid state relay (SSR). Available as a prepackaged module to do exactly what you need.

"My favorite programming language is...SOLDER!"--Robert A. Pease
 

Offline tekati

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Re: 5V logic to energize 220v contactor?
« Reply #2 on: May 27, 2015, 02:15:42 am »


That makes sense.

 

Offline Richard Crowley

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Re: 5V logic to energize 220v contactor?
« Reply #3 on: May 27, 2015, 02:21:20 am »
If you are going to use a triac, be sure to use proper isolation between your logic circuits and the mains voltages.
For example the MOC3022: http://www.allelectronics.com/make-a-store/item/moc3022/opto-isolator-triac-output/1.html

You would be much better off using a solid-state relay (SSR) as N2IXK suggested.
For example: http://www.ebay.com/itm/Relay-Solid-State-For-PID-Temperature-Controller-25A-SSR-25-DA-Output-24V-380V-/221777641731

Or perhaps a PowerSwitchTail
http://www.powerswitchtail.com/Pages/PowerSwitchTail240vackit.aspx
 

Offline Paul Moir

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Re: 5V logic to energize 220v contactor?
« Reply #4 on: May 27, 2015, 07:20:03 am »
A caveat is that a SSR will more commonly fail on then off. 
 

Offline netdudeuk

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Re: 5V logic to energize 220v contactor?
« Reply #5 on: May 27, 2015, 07:30:50 am »

You would be much better off using a solid-state relay (SSR) as N2IXK suggested.
For example: http://www.ebay.com/itm/Relay-Solid-State-For-PID-Temperature-Controller-25A-SSR-25-DA-Output-24V-380V-/221777641731


They're really cheap and I've been wondering how safe they are.  I've often thought that Dave ought to do a teardown to check.  Has anyone else looked inside ?
 

Offline matseng

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Re: 5V logic to energize 220v contactor?
« Reply #6 on: May 27, 2015, 07:34:36 am »
You would be much better off using a solid-state relay (SSR) as N2IXK suggested.
For example: http://www.ebay.com/itm/Relay-Solid-State-For-PID-Temperature-Controller-25A-SSR-25-DA-Output-24V-380V-/221777641731

I love that this seller also sells stuff like "New Womens Silk 3/4 Sleeve Nightdress Sleepwear Nightgown Nighties Pyjamas Set" :-)
 

Offline N2IXK

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Re: 5V logic to energize 220v contactor?
« Reply #7 on: May 29, 2015, 01:33:31 am »
A caveat is that a SSR will more commonly fail on then off.

So will a triac, in my experience.  Semiconductors of all kinds tend to fail short rather than open....
"My favorite programming language is...SOLDER!"--Robert A. Pease
 


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