ARCELI AC 220V 4000W High Power SCR Electronic Voltage Regulator Governor Dimmer Thermostat Speed Controller

Tried a few of these in the past and 9 times out of 10 they wern't a lot of bottle. Most only started to work around thr halfway mark. A variac is the reall answer if you want real control but then they can be exspensive. Enter the ARCELI AC 220V 4000W High Power SCR Electronic Voltage Regulator. At around £8.00 it's a steal. I bought a much more exspensive unit a little while ago to run my Foredom flexi shaft. Never was really happy with it. Always needed tweeking to get the speed right. I saw this litt;e unit on Amazon and thought '£8.00 let's give it a go.' Glad I did as I've now sold the more exspensive item and use the Arceli. If you decide to purchase one then please please please beaware of the incorrect 'Input-Output' terminals as stamped on the casing. Checkout the review post from G-duin as to correct terminal wiring with pictures.

I bought this to reduce the AC voltage going to a pedestal fan.It arrived quite quickly, though the packaging could be better. The outer perforated aluminium shield was a little squashed, but easily pushed back after removing & pressing back into shape and re-assembling. Wiring up was easy, the terminal labels were quite legible.Connected up to supply the fan, and yes it lowered the voltage and this reduced the speed of the fan. However, now we're into the realms beyond my 'A' level physics and electronic engineering knowledge. As I dropped the voltage & the fan speed reduced, the motor started buzzing. The further I reduced the voltage the louder the fan buzzed, so getting my desired fan speed, arrived with very loud buzzing which clearly was not sustainable ! So using this for very noisy drills/extractors/grinders etc may well be fine, as you'll probably not hear any buzzing.Back to the physics, Googling provides hints that buzzing is a reaction to supply voltage/voltage frequency, creating reactionary forces within the motor based on its construction, which may well be detrimental. So for me its back to the drawing board, with a possible route at voltage frequency!As to this product, well… ' it does what it says on the tin !!' .

These triac based SCR controllers are great at lowering mains AC down to your desired voltage. Things like AC lighting, heaters or motors can all be variably controlled from one of these units, giving fine ( ca. 1 V) control over the output load.The cost of these does make them very attractive controllers, but this cheap product has had corners cut to keep the price down. I have already had to return one of these items as it simply didn't work, 240 V in, 240 V out no difference when changing the dial on the front.My replacement has just arrived works but has been incorrectly labelled on the unit itself. Take a look at the attached photograph.In the listing the seller has a sticker showing you which side is the input and which is the output, (Left input, Right output). However, when the unit arrives it doesn't have a sticker on it and this is back to front (Left output, Right input). This is clearly a mistake on the impression made on the casing and hence why they have put a sticker on the listing photograph, the case's earthing terminal would be far away from the main input if it is followed by the metal casing's labelling another feature that indicates it is the wrong way around.If you follow the instructions on the metal casing, output on the left, input on the right - it will not work.However, reverse these and follow the picture in the listing (input on the left, output on the right) it will work as intended.The next issue is the labelling behind the variable resistor, this is very arbitrary and doesn't line up with the expected values on a 0-10 scale, assuming off, and 10% increments. The actual dial varies between 1-8 or 2 and 10 according to the scale. If you want a specific AC voltage, grab a multimeter and measure the output directly.Finally, the design limits access to the screw terminals under the protective cover as the metal casing covers part of this. A little fiddly, but with a bit of force you can still get a screwdriver in there, but again shows where the corners have been cut. Check the photo.The fact that the unit has been incorrectly labelled really lets it down hence the lower stars, but, wire it in correctly and measure your voltage output and you will have a great variable AC controller.

Does the job but took off 1 star as no markings for wiring input/output.Fortunately someone else had put a picture up showing wiring so i copied that and it works.Otherwise it works quite well for what i needed it for.

The input and output etching on the perpherated metal cover is supposedly incorrect. This is mentioned in the information at the bottom of the listing including pictures. The manufacturer should resolve this issue ASAP by correctly labeling the SCR electrical connections as well as providing a circuit diagram in the packaging.This could end up in electrical damage or a fire due to the incorrect terminal labeling.Come on Amazon get your act together to get this sorted out. I can't believe a customer had to post a picture and an explanation about this fault.

High power output control module. I use one to control my office heater and another to control a heating lamp for reptiles.Max power on most domestic equipment rarely exceeds 2kw. This 4kw device hardly gets warm, even under continued use. Nice piece of kit, applications only limited by the imagination.

Had a few of these things and this looks identical but, in terms of electrical performance, it's much better than any similar product.Very badly designed though as you cannot access the terminal screws without removing the plastic terminal screw cover and to do that you have to remove the metal cover casing.That said, I will be buying another very soon as I'm happy to put up with the terminal cover issues for the outstanding benefits of performance.

It works for controlling the speed of an inline 230VAC fan, but the ingravings 'input' and 'output' are reversed, as stated in other reviews. INPUT IS LEFT , OUTPUT IS RIGHT !