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Low volt relay or contact in a simple 110 volt plug in module?
This thread has 5 replies. Displaying all posts.
Post 1 made on Wednesday May 3, 2017 at 16:55
andrewinboulder
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Maybe I'm looking in the wrong place. Just want a plug in module that has a contact that opens when power is lost at the outlet. I was hoping not to cobble various parts together.

This is so the customer knows if there is a power loss at a GFCI outlet which powers a sump pump. I'm trying to notify an Alarm.com panel.
Post 2 made on Thursday May 4, 2017 at 02:15
Ernie Gilman
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Wall wart plus relay. Style of notification depends on what terminals the relay has. Even simpler, get something that indicates POWER when 12 volts is present and indicates POWER LOSS when 12 volts is not present. Use a 12 volt wall wart for the voltage source.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 3 made on Thursday May 4, 2017 at 07:31
King of typos
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What Ernie said about the 12volt wall wart. If the alarm.com panel is able to accept a 12volt (DC and/or AC). Then use that directly. This is so you'll be able to leave a failure point, the relay, out of the equation.

If you have no choice but to use a relay with a wall wart. Get an automotive relay, especially the modern ones. As they are designed to last. I have an 11 year old car with original relays. Some of them are active as soon as I turn the key and for the duration of the drive... 160,000 and 11 years is a long time and mileage.

KOT
Post 4 made on Thursday May 4, 2017 at 09:34
SWOInstaller
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On May 3, 2017 at 16:55, andrewinboulder said...
Maybe I'm looking in the wrong place. Just want a plug in module that has a contact that opens when power is lost at the outlet. I was hoping not to cobble various parts together.

This is so the customer knows if there is a power loss at a GFCI outlet which powers a sump pump. I'm trying to notify an Alarm.com panel.

Omron has many types of 120V coil relays with NO/NC contacts on them. You would need to use the NO so when the coil is powered it closes the relay, and when power has been lost it opens the relay.
You can't fix stupid
OP | Post 5 made on Thursday May 4, 2017 at 09:35
andrewinboulder
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Yeah, the 12 volt/relay solution is where I was heading - wish there was a slightly more elegant way in a single enclosure but oh well. I've got some automotive relays lying around from another job.
Post 6 made on Thursday May 4, 2017 at 13:35
Ernie Gilman
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On May 4, 2017 at 09:34, SWOInstaller said...
Omron has many types of 120V coil relays with NO/NC contacts on them. You would need to use the NO so when the coil is powered it closes the relay, and when power has been lost it opens the relay.

The contact info is of primary importance, because if you wire it the other way,

120V relays are generally not silent like DC relays. Almost all models buzz. And you'd have to enclose it and provide UL-approved power connections. A wall wart gives you UL approved power connections and a low-voltage output for a silent (DC) relay that could be mounted in a plastic box if you like.

Go with a wall wart and automotive relay. (I also ran into the automotives, Bosch in particular, and find them incredibly reliable.)
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw


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