K KRIËGER 150 Watts Voltage Transformer, 110/120V to 220/240 Volts Step Up Step Down Converter with AC Outlets, MET Approved Under UL & CSA

Update after SEVEN years (2016 - 2023): Still works absolutely flawless. Not a single hick-up. About a year back I put it under heavy stress in a remodel project with a German Bosch hammer drill to remove tiles in a dusty environment. No issues whatsoever. We don’t ever unplug it or shut it off. Still driving our Europan coffee maker and grinder. 1000% recommended brand and quality. I am using this transformer in the United States to power a Italian Rancilio coffee maker and a Askaso grinding mill. It has enough power to deal with both of those at the same time. The coffee sucks a maxmium of 1100 watts of power and the grinder 200 watts. It also works perfectly fine with a german mixer I own. This thing is perfect for people who live in the United States or other countries which have 110V/60Hz or even the other way around if they want to move to a European country with 230V/50Hz. The transformer works both ways. Just make sure that you have the right input voltage selcted on the backside. Conclusion: I have this transformer in daily use since a year. Sometimes its powered up the whole day. I switch it on and off with a switchable wall plug. If you do it this way make sure there is no load switched on it would cause peak currents otherwise which can damage the transformer, the switchable plug or the attached devices. The design of the transformer is very sturdy. It feels nice and well fabricated. It is also super heavy. It feels good that way. No smell or noise coming out of it. I also tried it with a European hair dryer, 900 watts. Worked perfectly as well. 100% recommendation.

Bought this ULT350 to power a 170w receiver I bought in the EU. Only had it for a day but I've had it powering the receiver for hours without any issues. Runs quiet, and the case has stayed cool. Hopeful that it'll run this way for a while. When you're buying just remember you should buy a unit that's at least 50% over the wattage of whatever you're going to power.

A solid transformer - I got the 1700W model to be able to use all my European/UK appliances after a move. It works fine - it's of solid construction (heavy, proper brick weight!), adequate cooling and generally electrically sound. It feels like it can actually handle the nominal rating (unlike many of the devices with "best case" ratings). I'm using it mainly with a coffee machine from the UK (1300W), but mixers and toasters work without issues, too. Caveat - if you don't have anything else on, you'll hear a slight electric hum even if it's under minimal/no load, though it's definitely not loud, so it's more a question of anything else being louder (like a fridge, if in a kitchen).

I highly recommend this product and its manufacturer. I bought the ULT850 (850W) to use up to 650W at 220Vrms 50Hz. I chose it because (1) it has a toroidal core, (2) it is very well assembled inside, (3) it is from the USA and (4) its design is compact and simple. I received it quickly, and in the box I found exactly what was advertised. I tested it with no load and with a moderate load (with oscilloscope). It is quiet and delivers the pure sine wave voltage it should deliver. Some buyers complain because it does not transform the FREQUENCY. It is true, but no transformer does that !!! To buy this type of product you have to have the minimum knowledge. If not, you have to ask someone else to make the purchase. Other buyers complain because it is EXPENSIVE . . . THAT IS NOT TRUE ! Just look at other similar ones. In particular, it is important to consider the quality of the materials and the way it is assembled. This product has an excellent quality-price ratio. Finally, there are those who say that it is NOISY. It's hard to believe that, because the magnetic field leaked by a toroidal core is minimal. To make it noisy, it would have to have a fracture in the ferrite core. That could happen after a heavy hit, but the casing would also have to be damaged. Therefore, if the transformer is noisy, surely the core is fragmented and so you should contact the manufacturer, Kriëger, who have EXCELLENT CUSTOMER SERVICE.

[Edit - rewritten after I used it for a few months] Used it, works fine, powered several old Russian analog audio effects devices and a vintage Roland guitar synthesizer with euro 220 volt power supplies off of it (with a euro style power strip I bought off Amazon of course) It is very well constructed, better than any other step up down transformer I’ve owned before. And it is UL listed (Or at least said so in the listing on Amazon) which is also unlike most others I’ve seen, and it was relatively inexpensive which are why I bought this model.

We brought 4 of these transformers, 2 1700W ones and 2 smaller ones, when we moved from the US to Europe. One handles all our American kitchen appliances and the other my power tools. Construction is solid and it's quite heavy. Everything works, even fairly large motors with a data plate rating close to 1700W.(Of course, if you move between 50 and 60 Hz, the speed will be slightly off but that's not the fault of this unit.)

Haben mehrere 120V Geräte im Haushalt hier in Deutschland und entsprechend bereits mehrere Konverter angeschafft. Dieses ist der bisher beste Trafo den wir erhalten haben. Der Trafo ist seit geraumer Zeit in dauerhaftem Betrieb und es gibt bis auf einen kleinen Makel eigentlich keinen Grund zur Beanstandung. Unsere Bewertung bzw. Anmerkungen: - Gehäuse: Front- und Rückplatte aus Kunststoff, Oberseite und Seitenflächen ist aus einem Alubiegeteil realisiert. Die Unterseite besteht aus Stahl, die Gummifüße sind angeschraubt. Gehäuse erscheint insgesamt sehr hochwertig, gute Wärmeableitung - bei Betrieb unter Last auf ausreichenden Raum um den Trafo zur Luftzirkulation achten. - Die angegebenen Maße sind inklusive der Höhe der Gummifüße und der hinten überstehenden Sicherungssockel (Maße des Erhaltenen Trafos: L/B/H: 20cm/12,8cm/9cm). - Anschlussleitung mit Kaltgerätestecker, ermöglicht Adapterfreien betrieb in unterschiedlichen Ländern. - Zwei Feinsicherungen auf der Rückseite, je eine für die 120V und 240V Seite. Schiebeschalter zur Wahl der Eingangsspannung auf der Rückseite. - Grüne Betriebskontrollleuchte (LED) an der Vorderseite über Ein-/Ausschalter. - Je eine US und eine deutsche Steckdose an der Vorderseite (Keine Steckdosen auf der Rückseite). - Trafo arbeitet geräuschlos, kein Brummen im Leerlauf oder unter Last zu hören. Einziger Makel: Die Anordnung der Steckdosen auf der Vorderseite ist nicht ideal. Sieht nicht so schön aus wenn der Trafo wie bei uns offen steht und die Stecker nach vorne abgehen. Auch wird in unserem Anwendungsfall die Kontrollleuchte vollständig und der Ein-/Ausschalter zur Hälfte von dem Stecker des angeschlossenen Gerätes verdeckt (siehe Bild). Trotzdem aus unserer Sicht 5 Sterne da dieses schon vor Kauf ersichtlich ist und dadurch die Maße des Trafos sehr gering bleiben können.

Pesante il giusto (trafo), compatto, robusto, ben rifinito completo di fusibili di protezione e cavi. Ottima confezione con istruzioni. Alimentata lavatrice ultrasuoni a 110 Vca (rete 230 Vca). Nessun problema. Consigliato.

Works well with no noise I could detect. Proper unit without overheating issues other cheaper units are known for.

Super appareil qui fait son travail pour des appareils électroniques des Etats-Unis (Bose system).

I emigrated from the UK to Canada ... and found it impossible to part with my UK kitchen appliances (food processor, blender, etc.) and my power handtools ... Dremel rotary tool, Bosch hammer drill, B+D reciprocating saw, drivers, etc). This is an absolute joy ...