Mophorn 2KVA Transformer Max 20 Amp Variable Transformer 0-130 Volt Output Variable AC Voltage Regulator for Industries Equipment Appliances

Arrived prompt and works fine.I saw a lot of "needs work before usage" so I opened it but found nothing to complain, it is solidly build, all welding points are nicely done.I use it for speed regulating 2 standard-floor fans, each has about maybe 80 WattI took care that the device is always in the wind stream of one of those fans and still check from time to time if it gets hot but nothing, even on 16 hours usage a day.Fans are nice and quiet now, usable even on nighttimeI haven't tested if the Display shows exact voltage (many ratings say it differs) as that is meaningless to me and the current that comes into the house differs +- 5 Volt, depending on daytime.I have the 500 Watt version with LED-meter and it came with 2 spare-fuses but haven't needed any yet.Recommendable.

Ever since we moved in, my guitar amps have sounded strange... really Muddy and lacking clarity.I tested the wall voltage and we are getting 125v-126v... Old Fender amp circuits are designed for 117v, so I used the variac to bring the wall power down to spec. Tested the onboard outlet with a quality multimeter and the led display is right on...My only complaint is that the generic voltage dial decal on the top is VERY incorrect. I currently have it on 117v but it shows 104v on the dial... No big deal, but that's a dangerous inconsistency for those who don't know any better... That being said, I wont lower my rating, as I doubt anyone will casually be buying a variac and NOT know to start from the lowest setting and bring it up until desired voltage is reached and double checking with a meter for accuracy...I would certainly recommend this one over the analog meter style...

Don't drop it on your foot, it's heavy AF. Check the dimensions—its not so much big in size as in size-to-weight. But that's to be expected with a 20 amp Variac. Also, the smaller models still weigh more than what you'd expect for the current that they carry. Not sure why that is, but probably has to do with voltage accuracy and thermal management. I felt like I should be able to get away with a much smaller, lighter device to manage voltage, but I'm sure they have valid reasons as materials are expensive, and most companies scrounge.This guy sits on my workbench right next to my DC bench supply and has come in handy for a lot of things. It's very accurate and sturdy, and the only issue I've had is that it's hard to read where the dial is from a distance. I used a label maker to print a black and white arrow for this, but it's still facing away from me if the voltage is set anywhere below 90-ish volts. The LED inside the power switch does seem to come in handy for me, and I may have to make an LED stack just to show voltage output. Maybe they should have a model that includes one; that would help.For the price, it's a steal. These things seem to appreciate with time, so it's probably not going to lose value any time soon.

First off, this is a very good value for an adjustable auto-transformer of this size. I have several 'name brand' units, but need an extra for a new project, and this was too inexpensive to pass up. And it worked fine after some modifications.Initially, as others have pointed out, grounding was done poorly in the unit as shipped. This was several months ago, so perhaps the've improved things since. There was only one ground wire attached to the outside shell containing the power switch, meter and outlets and it was not properly done. No 'star' washer nor did they remove the (rather substantial) paint from under the washer before attaching. Further, there was no 'copper' ground path to the major shell surrounding the autotransformer, itself. And given the good quality of the paint barriers between the two metal housings, it was clear there wasn't a sufficient 'ground' path between them. I added an additional #12 green wire to fix this, using a 'star' washer on the main frame. Grounding problem solved.After few months of service, the unit suddenly wasn't able to turn on. I had been using it at about half it's rated load (1.2kva) of the 2kva rating, so not really running it hard. But in spite of this rather light 50% load, the power switch housing melted and freed the power pin that runs to the fuse. Dead.Fortunately, Digikey carried a near replacement (EG5597-ND) with rating to 20A 115VAC, cost $1.94 in single quantity.) Switch is from E-SWITCH and is solidly built. It did require a bit of filing of the opening in the metal shell, as the as-built switch was about .5mm smaller in each dimension. After this mod, the unit was 100% back in commission.I suggest you avoid the urge to purchase one of the similar switches on Amazon as the suppliers all seem to carry the same cheap switch as was in the unit initially. Using a non-thermosetting plastic was a bad idea because a little warmth caused the plastic to 'flow' until contact starting heating due to resistance caused by the now, poor connection. Stick with a switch that a UL label (the original unit does not.)I should also point out that when making the new switch connection, I avoided soldering wires to the switch, as that's a no-no with a 2kva appliance. Crimped spade-lug quick-connects were added to the wires and these were used to make the connection to the switch. I was tempted to do this same to the socket connectors, but saved that for 'next time.' And I *will* remove and replace the 'hot snot' hot-melt glue that used to anchor the cord and sockets to the metal shell. This isn't an automatic 'safety' issue, but it's just gross.Otherwise, this appears a very fine, inexpensive, and so far, reliable device. I may purchase another but will definitely apply these modifications before use. And hopefully the manufacturer will take these suggestions and make the necessary safety mods to their future units. "Name brand' units go for at least twice what this unit cost, so there is a bit of room to improve and still have a great price.

Since I was 15 years old, I have longed to own one of these way back when RadioShack was still a real electronics hobbyist's store. This device is rock solid.With respect to accuracy, this is a transformer after all, so the voltage that comes out depends on what goes in. Since most U. S. house AC is actually 120VAC or even slightly higher, divide your actual house AC voltage by the rated 110VAC on the unit, and multiply the voltage on the dial by that factor to estimate the voltage that actually appears at the socket; turning the dial to 110 will give a little over 120VAC, and turning it to 120 will give you about 132VAC out. Definitely something to keep in mind. The front panel meter is a good guide for the voltage that actually appears at the socket.

Awesome product works very well

El transformador funciona bien, con excepción del medidor de voltaje, porque marca ± 10 volts de diferencia cuando tienes el transformador en bajo voltaje de salida, y en la medida que vas subiendo el voltaje al que tiene la red, la diferencia se va reduciendo.En todo lo demás funciona muy bien

I really enjoy buying an item and that item being exactly what I expected.- Could it be more accurate? Yes, the dial is a bit off and non-linear.- Could it have more options? Maybe they could add an isolated mode (where you disable earth ground with a switch or similar) so it could be used in many lab testing scenarios... Nothing that an EE cannot modify by themselves anyway. I did, I simply added a switch on the ground earth, and I can make this device isolated or not depending on what I am testing.- Construction of the device seems solid; the dial feels sturdy and precise.- Only sad point: internals are cheaper than expected and corners have been cut. There is no connection hardware to the buttons and plugs: everything is hand soldered. I had to redo some of them because I felt like moving the device from my storage to my lab could eventually break something. I really mean it: cold solders, barely touching the solder tabs, etc.My comments are all in accordance with the fact that the price is very reasonable.

Just received today. After visual inspection I did not find any damage. I connected it to 120 V AC receptacle. Without load it takes 0.07 A. And is extremely quiet. Attached digital multimeter shows output voltage from 0.6 V at minimum to 149 V maximum. With fine adjustment - every step is one volt. Good enough for me. Integrated voltmeter is just for orientation.I hope this is perfect gadget for my hobby.

Pour une fournaise aux granules et le courrant venant d une génératrice le courrant n as pas de variation.tres belle achat et bon prix merci