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#165131 - 06/19/07 11:54 AM Low Voltage Contactor  
Tiger  Offline
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
I need a contactor for a special doorbell chime. The chime is 120-volt and the coil on the contactor can be 16 or 24 volt. Anyone know a manufacturer?


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#165133 - 06/19/07 12:18 PM Re: Low Voltage Contactor [Re: Tiger]  
JValdes  Offline
Joined: Jun 2007
Posts: 301
South Carolina
Yes. Check Click on E-Catolog. Search part number CW07L310G. Around $25.00.

You can find what you need very easily anywhere. Contactors with 24 VAC coils and contacts for the required current. You can try your local supplier.

#165138 - 06/19/07 07:05 PM Re: Low Voltage Contactor [Re: JValdes]  
JCooper  Offline
Joined: Dec 2002
Posts: 228
Kendall Park, NJ USA
SquareD makes such an animal and a nice little box for it, I used a 30 amp contactor driven with 24VAC. I think the enclosure was more than the contactor, and I got it from Grainger.

Does it have to be a contactor? Can use use a normal cube relay? Most have 10 amp contacts and can be found for 12 or 24 vac/vdc

Last edited by JCooper; 06/19/07 07:08 PM.

#165139 - 06/19/07 08:26 PM Re: Low Voltage Contactor [Re: Tiger]  
togol  Offline
Joined: Sep 2005
Posts: 421
Dave, here is a 12A 8pin it even has a test button and LED indicator along with a base it's about 10 bucks


#165140 - 06/19/07 09:40 PM Re: Low Voltage Contactor [Re: togol]  
Tiger  Offline
Joined: May 2005
Posts: 706
Crystal Lake, IL USA
Thanks everyone. I did a Google search and found that 24V contactors are used in air conditioners. I called my supplier again and he found one for me. He also asked about a relay, but I'm not very familiar with relays.


#165143 - 06/19/07 10:53 PM Re: Low Voltage Contactor [Re: Tiger]  
Joined: Mar 2004
Posts: 251
Kingwood, TX USA
AC contractors call the contactors with a 24v transformers "fan centers" I ofen use them to control special circuits which require low voltage control. Relays are 12 amp or better. They mount on a 1900 box and seperate low from high. Robert

#165157 - 06/20/07 08:52 PM Re: Low Voltage Contactor [Re: Tiger]  
Dave T  Offline
Joined: Jan 2005
Posts: 155
Waukesha, WI, USA
Just a suggestion.
Your LV source may not have enough va to energize a LV contactor coil. I would suggest that you incorporate an interposing relay of which its coil, 24vac for example, will function easily with your LV source. When it is energized it would close a contact that would energize the 120v coil which controls the chime.
Also, you wouldn't be plagued with a voltage drop between the bell transformer and a contactor with a LV coil. The coil of a small interposing relay would draw very little current and be controled by a conventional door bell switch. Otherwise, a convertional doorbell switch may not be able to handle the LV current required to pull in and hold a common contactor.
I believe there would be a much less trouble using an interposing relay.
This is intended to think outside the box a bit.

#165161 - 06/20/07 10:00 PM Re: Low Voltage Contactor [Re: Dave T]  
gfretwell  Offline

Joined: Jul 2004
Posts: 9,142
You can get some little ice cube relays that handle 5a at 120 and some small metal can relays will do 20a @ 250. What kind of "chime" is this that needs a contactor?

Again I am thinking SSR ;-)

Greg Fretwell

#165199 - 06/22/07 12:48 PM Re: Low Voltage Contactor [Re: gfretwell]  
JValdes  Offline
Joined: Jun 2007
Posts: 301
South Carolina
Dave T, Perfect suggestion.

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