EI Type Isolation Transformers PRI.120/208/240 V AC 50/60Hz 24 V AC 40 VA Class 2 Control with Foot Mount Replacement for Jard 4031F HVAC Furnace Multi Tap Packard 42440 Gemline GT446

I connected it to a 120v source and confirmed 24 volts were coming out of the secondary side. Its easy to setup and works as expected.

I got this as a replacement for the unavailable transformer for my Mr. Heater Big Maxx garage heater. Works great. The only negative is that it is larger than the old one, but it's not a direct replacement either. Anyhow it works and I have heat in my garage and that's what's important.

Goodman air handler already had a aftermarket transformer installed, fan would not come on intermittently. This was a third the cost of an original replacement. We went for it and it works just fine. Inexpensive fix for my 24yr old central ac that blows colder than the new junk.

After moving connectors from original, this transformer is nearly a drop in replacement for our Pentair Sta-Rite Max-E-Therm pool heater. Keep in mind the 208 volt lead is not used here and is not connected to anything.

Easy to install and worked as it should for application.

My a/c blower would 't start...and eventually I could smell plastic burning. Having no idea, I did some quick googl'ing. Determined it was likely the transformer, which I removed from the board (it smelled like the culprit; and also looked to be "cooked"). I knew it was 115/24, 2 wire in and 2 out. So, I rolled the dice and purchased this. Wired it up and attached to the unit (not the exact same size; but anyone with a brain can figure an alternate work-around). Turned the power on expecting disaster. Nope, it worked perfectly. All is well. Heat is back on.

The transformer was dead on arrival. The return was handled well. I'd recommend staying away from these cheap Chinese made transformers. This was the second China made transformer for a different seller that was bad. I ended up paying more locally, made in Vietnam, and it worked. Since this transformer didn't work, it's 1 Star from me.

$17 versus $400 from an AC shop. That’s A+++++ regardless if it’s a cheap part. Works perfectly on a carrier furnace needing 110V. You’ll need to choose the correct wires for your voltage needs but make sure you wire nut any wire not used.