I'm looking for suggestions on a 24volt relay with contacts that can
handle 120V, 7 amps. I'm looking to install it to control a new 120V
outlet that is going in an attic and needs to be controlled by a 24V
signal to turn it on. So, I'm looking for one that is cost effective
and can be mounted in some simple type of wiring box. If it can go in
the same box as the outlet, even better. I'd like to make this code
compliant and do it right. Plenty of space is available as I can
mount just about anything on a stud in the unfinished attic.
Thanks for any input.
Try something like this
The RR7 is a good choice
It has a turn on and a turn off coil and latches in the last state you
put it in. You control this with a momentary contact SPDT center off
On May 11, 3:12 pm, email@example.com wrote:
I controlled a relay like this powering the coil with only 9v
batteries. Since there is no hold-in current required you can put a
capacitor in parallel with 3 9volt batteries and use a couple of push
buttons to control it. The batteries will last practically their shelf
What are you attempting to automatically control with the relay ?
What is the source of the input control signal ?
The most difficult issue for you is going to be finding an enclosure
which isolates the line voltage side of the relay from the low
Depending on what you are using for your control input you might
want to find a relay that is made by the same company as the
rest of the equipment in place... It would also be a good idea
to obtain information from the OEM asking them if using the
equipment with an external relay is safe and won't interfere with
the normal operation just so that whatever accessory you are
going to be controlling via the relay won't void a warranty or
something like that if external relay terminals aren't provided...
I was going to suggest a typical boiler relay like Taco SR501, but then I
saw both John Grabowski's, and gfretwell's replies, which make even more
sense. I don't know the one John suggested, but if you can live with the
amperage rating, it's a nice self contained unit. The rr7 that gfretwell
suggested, does need a 24 volt power supply, but it has a high amperage
rating, and those relays will last forever.
*Roy I recently discovered these when a customer asked me to fix his closet
light. I thought that it was a nice compact unit that is made to fit in an
electrical box. It can also be used to replace relay switches. The OP
didn't mention what the load consisted of so I threw it out there for him to
decide if he could use it or not.
It is a sweet little relay. It's kind of like the electric heat relays only
smaller. I've been buying from Tequipment recently, in fact I just got a
couple of proximity voltage testers today, and I got my last pair of Klein
lineman's from them. They have incredibly low prices, and being in NJ the
shipping is quick
*The customer service at Tequipment was very good when I called for the
relay. I was going to drive down to pick it up, but the woman on the phone
said it would ship out the same day I called and I would have it the next
day. Sure enough I received it the next day. I will check out their prices
Of the suggestions, it looks like the one that will work is Daring
Dufas's relay in a box suggestion.
It meets all my requirements:
easy to mount as it comes in it's own box
15 amps so controlling outlet on 15 amp circuit is OK
takes 24V input
available online for $21
One remaining question. Someone mentioned isolation of the 24V
circuit from 120V circuit? I would assume that since an electrical
equipment manufacturer is making these relays and they are UL listed
they are OK and meet code for my application even though the 24V wires
obviously go into the same box as the 120V wires?
Thanks again for the suggestions
Happens inside your heating systems so I'm guessing it's ok. If you
want to go cheap look behind some hvac contractors on the weekend for
junk ac compressors. They all have a relay that is pulled with 24vac
and handles anywhere form 20 amps and up. The hvac guys call them
contactors but it's just a relay.
HVAC guys and control system guys like me use the RIB because
we're lazy and don't want to have to do a lot of screwing around
to accomplish a simple task. I'll pay $20 for a manufactured
solution rather than blow $100 worth of labor to build my own.
It's simple economics, I only build things that aren't available
off the shelf for a reasonable price.
Better is the relay like the RR7 where the coil part sticks out of the
box through a 1/2" K/O and the 24v is not exposed to the 120v side.
Those relays that have both in the same box are listed as part of a
piece of listed equipment, not general premisses wiring.
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