ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

ECN Shout Chat
Top Posters(30 Days)
Admin 19
Recent Posts
fuse rejectors
by NORCAL. 03/29/17 01:44 AM
Old decora style outlets
by NORCAL. 03/29/17 01:41 AM
NFPA stuff
by gfretwell. 03/28/17 08:08 PM
Anyone hiring inspectors?
by HotLine1. 03/27/17 08:03 AM
ESA Arc flash course
by TheShockDoctors. 03/24/17 10:15 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
231,908 Are you busy
166,781 Re: Forum
160,892 Need opinion
Who's Online Now
1 registered members (HotLine1), 55 guests, and 16 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#165131 - 06/19/07 12:54 PM 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?


Work Gear for Electricians and the Trades

#165133 - 06/19/07 01:18 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 08:05 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 08:08 PM.

#165139 - 06/19/07 09:26 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 10:40 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 11:53 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 09:52 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 11:00 PM Re: Low Voltage Contactor [Re: Dave T]  
gfretwell  Offline

Joined: Jul 2004
Posts: 9,060
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 01:48 PM Re: Low Voltage Contactor [Re: gfretwell]  
JValdes  Offline
Joined: Jun 2007
Posts: 301
South Carolina
Dave T, Perfect suggestion.

Member Spotlight
Washington...Not DC
Posts: 216
Joined: March 2005
Show All Member Profiles 

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.015s Queries: 15 (0.003s) Memory: 0.7999 MB (Peak: 0.9708 MB) Zlib enabled. Server Time: 2017-03-31 00:31:17 UTC