Looking for a solid state relay with transformer similar to Honeywell RT850
I was delighted to find the RT850 unit to use for switching a Taco 006 circulator. It's current rating was higher than needed because it seems designed for resistive heating, but it was a nice simple package. Unfortunately it doesn't come in 120v! I can get it without the transformer, but that's not nice and neat. Does anyone know of a similar unit?
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Make it simple , use a switching relay …
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The one I have is very noisy. It's a small apartment and the idea of the quiet solid state seemed appealing as I was needing to replace it to get a C wire anyway.
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OONO F-1057 Looks like it will work. Contacts are rated 22 amps (resistive I think) 120-24 volt transformer built in and you can get a C wire off it. Less than $30 Don't know if it is SS but you won't be able to here it.
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This style of relay won't be silent but it will be quiet, it won't be anywhere near as loud as the relays used on a fan center:
https://www.supplyhouse.com/White-Rodgers-90-293Q-Fan-Relay-Type-84-24-VAC-Coil-SPDT-Coil-Data-90-Ohms-DC-Resistance-125-mA-Nominal-3-VA-Nominal-4-VA-Inrush0 -
Thanks. Will it be quieter than the Honeywell RA832A I pulled? What's the essential difference? I'd have to find a box to put that and a transformer in.
I was looking at SS relays on Amazon, and they're similarly priced for the load we're talking about. The Taco 006 is only like 0.5A. Generally they're DC on the signal side, so I'd have to convert the 24VAC to DC for it. I've built these AC-DC myself many time for motor controls, just a bridge rectifier and a big electrolytic capacitor. So I'd need to put the relay, transformer and a AC-DC converter into a box. Is there's something I'm missing?
,
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Looks good, but why do you say I won't hear it? If it's mechanical it clicks, right? I've used the Taco pumps with the built in thermostat circuit, presumably they have a mechanical relay, and while I can hear them click, it's nowhere near as loud as the Honeywell RA832A.
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probably don't need to filter it if you're just triggering a relay. there are ss relays with ac trigger ratings. look in the mouser or digikey catalog.
you can get a transformer that mounts in a knockout.. you can use a 4" square or 4 11/16 box to mount the relay in. you can also get a TIB brand relay that mounts in a knockout. you need to look at the horsepower rating of the relay and the circulator motor because there is an inrush involved when the motor starts.
you could also keep the honewell control in place and just use its transformer and a separate relay. the built in relay is probably rated 1/2 hp or more to control 3 piece circulators and oil burners, it needs more opening and closing force to deal with the higher power.0 -
The ones I saw were all DC in the lower voltages, AC was 80v and more. The old relay unit doesn't have a C wire, so without hacking and soldering one in that won't work. For $30 I should probably check out the OONO F-1057. if it's quiet then I win a round finally.
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That relay has a transformer in it. What do you need another transformer for
These relays are like a Rib relay, and you can't hear those pull in.
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Hello Jells,
So you want a Solid State Relay with120 VAC control of a 120 VAC load ? Maybe try this;
Mouser #: 576-SIR2B20A4
Mfr. #: SIR2B20A4
Mfr.: Littelfuse
Description: Solid State Relays - Industrial Mount SOLID STATE RELAY-ISOLATED
Load Current Rating: 20 A
Load Voltage Rating: 120 VAC
Relay Contact Form: 1 Form A (SPST-NO)
Output Type: Triac
Control Voltage Range: 90 VAC to 150 VAC, 90 VDC to 150 VDChttps://www.mouser.com/ProductDetail/Littelfuse/SIR2B20A4?qs=5aG0NVq1C4yHd71RFPaTXg%3D%3D
If you are actually looking for 24 VAC control and 120 VAC load, maybe something like this;
Mouser #: 881-SHC23A50
Mfr. #: SHC23A50
Mfr.: Teledyne RelaysDescription: Solid State Relays - Industrial Mount
Output: 50A, 24-265VAC
Control: 20-280VAC, 22-48VDC / Zero-cross / IP20 coverNational - U.S. Gas Boiler 45+ Years Old
Steam 300 SQ. FT. - EDR 347
One Pipe System0 -
Thanks, but no, I want 24 VAC control of 120 VAC.
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Sorry, which relays?? there's been a number discussed so that "that one" and "this one" I'm not able to follow. The Oono you suggested looks great, but there's few reviews, and one on Amazon says it failed in a month. That's not encouraging.
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Aube rc840t-120 might be what you are looking for.
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That's exactly what I ordered off Amazon an hour ago. Hope it's quiet.
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if you do the same parametric search at mouser but with a 24v or 24vac trigger you'll find what you're looking for
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i think the Aube is the same as the oonof-1027
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Got the Aube rc840t-120 in, bench tested it and it's very nearly inaudible! Perfect. Thanks all!
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Looks that way. Dunno. There's a whole lot of rebadging going on with these devices. That RT850 seems to have at least 3 badges. I'm ok paying $20 more for a device that seems to have more behind it.
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