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#165131 - 06/19/07 09:54 AM Low Voltage Contactor
Tiger Offline
Member
Registered: 05/04/05
Posts: 706
Loc: 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?

Thanks,
Dave
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#165133 - 06/19/07 10:18 AM Re: Low Voltage Contactor [Re: Tiger]
JValdes Offline
Member
Registered: 06/03/07
Posts: 301
Loc: South Carolina
Yes. Check www.wegelectric.com. 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.
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#165138 - 06/19/07 05:05 PM Re: Low Voltage Contactor [Re: JValdes]
JCooper Offline
Member
Registered: 12/30/02
Posts: 228
Loc: 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


Edited by JCooper (06/19/07 05:08 PM)
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#165139 - 06/19/07 06:26 PM Re: Low Voltage Contactor [Re: Tiger]
togol Offline
Member
Registered: 09/15/05
Posts: 421
Loc: NW In. USA
Dave, here is a 12A 8pin http://web4.automationdirect.com/adc/Sho...lays/750-2C-24A it even has a test button and LED indicator along with a base it's about 10 bucks
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Tom
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#165140 - 06/19/07 07:40 PM Re: Low Voltage Contactor [Re: togol]
Tiger Offline
Member
Registered: 05/04/05
Posts: 706
Loc: 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.

Dave
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#165143 - 06/19/07 08:53 PM Re: Low Voltage Contactor [Re: Tiger]
WESTUPLACE Offline
Member
Registered: 03/29/04
Posts: 251
Loc: 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
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#165157 - 06/20/07 06:52 PM Re: Low Voltage Contactor [Re: Tiger]
Dave T Offline
Member
Registered: 01/22/05
Posts: 155
Loc: 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.
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#165161 - 06/20/07 08:00 PM Re: Low Voltage Contactor [Re: Dave T]
gfretwell Offline


Member
Registered: 07/20/04
Posts: 9039
Loc: Estero,Fl,usa
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
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#165199 - 06/22/07 10:48 AM Re: Low Voltage Contactor [Re: gfretwell]
JValdes Offline
Member
Registered: 06/03/07
Posts: 301
Loc: South Carolina
Dave T, Perfect suggestion.
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