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DROK® Micro AC 110V 4000W Voltage Regulator SCR 110VAC Dimmer Speed Controller Temperature Governor Power Monitor Dimming Monitor

3.7 3.7 out of 5 stars 224 ratings
Currently unavailable.
We don't know when or if this item will be back in stock.
  • Adopts double insulation, meaning there will be no electric leakage if short-circuit or SCR burn out
  • Anti-spike and anti-surge protection, RC absorption, fuse all enhance usage safety
  • Aluminum case prevents it from easy damagement; filled tin stops it from heating when in huge current
  • With safety cap and connection post; thicker and larger heat sink
  • Maximum power: 4000W (connected resistive load); Long term operating power: 3000W.

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Package Dimensions ‏ : ‎ 4.3 x 3.7 x 1.8 inches; 5.61 ounces
  • Item model number ‏ : ‎ 090455
  • Date First Available ‏ : ‎ March 21, 2013
  • Manufacturer ‏ : ‎ DROK
  • ASIN ‏ : ‎ B00BXUCWQG
  • Customer Reviews:
    3.7 3.7 out of 5 stars 224 ratings

Product Description

Parameters:
Working voltage: AC 110V to 220V
Maximum power: 4000W (connected resistive load)
Long term operating power: 3000W
Voltage regulation: begin from 10V
Dimensions: 91 x 59(do not include knob) x 34MM
Protection: anti-spike, surge, RC absorption (EOC)

How to use:
Connect output of the adjustable power supply board with lamp, home appliance, electric circuit and its input to 220V AC,
then rotate the knob for dimming, speed, voltage, temperature control.

Some application:
Electric furnace, water heater, lamps, small motor, electric iron etc.

Package Includes:
1x Voltage regulator

Product guides and documents

User Manual (PDF)

Looking for specific info?

Customer reviews

3.7 out of 5 stars
3.7 out of 5
224 global ratings

Customers say

Customers like the quality, value, and build quality of the precision measuring product. For example, they say it works well, is good for the price, and is well built. Some appreciate the ease of wiring. That said, some complain about the adjustment and temperature control.

AI-generated from the text of customer reviews

72 customers mention55 positive17 negative

Customers like the quality of the precision measuring device. For example, they mention it works well, is compact and useful as-is, and works great as a speed control for 90 V. DC motors. Some say the performance has been good.

"...It works perfectly. Can't speak to the longevity but it works well, and runs cool (with no load)...." Read more

"...It still works great for the purpose I'm using it for.If you want to maintain high torque at lower rpm then you should use a variac...." Read more

"...It was blown. I replaced it and the unit works just fine. I truly appreciate the assistance and time you spent in working with me...." Read more

"...After 30 minutes the device failed...." Read more

24 customers mention24 positive0 negative

Customers appreciate the value of the precision measuring. They mention it's a low cost solution for variable voltage and a great buy.

"Very inexpensive. Works as advertised. Used it to run a 1500W heating element and was able to dial temps very accurately. Unit barely got warm...." Read more

"...but this did not effect performance.price point is awesome!" Read more

"...Happy with it for the price though." Read more

"This is great for the price, and works as advertised. I am using this to regulate a quartz lamp in a vacuum chamber...." Read more

9 customers mention9 positive0 negative

Customers are satisfied with the build quality of the precision measuring instrument. They mention that it is very well built, has a protective case, and the leads have a nice rotating cover.

"...I like the protective case and the leads also have a nice rotating cover that prevents the lead screws from being exposed after you connect the wires..." Read more

"...Design wise, the unit appears to be well built in terms of its build quality but I have one or two criticisms about its design...." Read more

"...all around the product was very well built would buy again" Read more

"This unit is solid. Could have wider spaced connections for heavier duty wire. Used twice on a home brew system. Worked well." Read more

9 customers mention7 positive2 negative

Customers find the wiring of the precision measuring device to be easy. They mention that it works great, is easy to splice into a workshop power cable, and connects with provided terminals which are marked for input and output. They also say the setup is pretty elementary and makes it easy to swap tools.

"...No gradation on the dial so have to go by feel. Was very easy to splice into a workshop power cable...." Read more

"...Easy to connect with provided terminals which are marked for input and output...." Read more

"...Instructions are not to be found antwhere. Hookup is pretty elementary but what kind of ventilation is recommended for longevity of the product." Read more

"...It worked great and was easy to wire up." Read more

13 customers mention7 positive6 negative

Customers are mixed about the temperature control of the precision measuring instrument. Some mention that the unit barely gets warm, while others say that it gets a little hot if they run it wide open. Some say that the module just barely got warm and that it runs hot without a fan.

"...Can't speak to the longevity but it works well, and runs cool (with no load)...." Read more

"...in the middle at about 1,000 watts and after 10 minutes it was getting noticeably hot. After 30 minutes the device failed...." Read more

"...Unit barely got warm. No gradation on the dial so have to go by feel. Was very easy to splice into a workshop power cable...." Read more

"...top load I applied was about 1.2kw, the module just barely got warm, I do believe this could control a 3kw load with no thermal issues...." Read more

8 customers mention5 positive3 negative

Customers are mixed about the speed control. Some mention it gives them great speed control all the way from a few rpm to, and it has allowed them to individually control fan speed on their food dryer. It can effectively throttle secondary voltages and helps regulate the power of their 1800 watt oven. However, others say it's not for precision speed control, not good for a motor control, and doesn't provide full torque at low RPMs.

"...I haven't run it for long but so far it gives me great speed control all the way from a few rpm to 24,000 rpm...." Read more

"...HOWEVER, it can effectively throttle secondary voltages! so if the exact waveform doesn't matter, go nuts. just watch out for peaks...." Read more

"Not good for a motor control..." Read more

"...This unit has allowed me to individually control fan speed on my food dryer and enabled me to lower fan speeds for thin crust like food that would..." Read more

11 customers mention0 positive11 negative

Customers are dissatisfied with the adjustment of the precision measuring device. They mention that it does not vary the voltage, has no duty modulation, and does not regulate the output voltage. The potentiometer that's installed is large and doesn't have the range of adjustability that they would have liked. They also mention that the device gets a little voltage oscillating at full power.

"...of attenuation of the output voltage. This thing is a turd...." Read more

"first off. this is a Phase fired controller.it does not change the input voltage. also, it is not isolated...." Read more

"...I have had no heat issues with the burner. I do get a little voltage oscillating at full power but was not designed toe used to control a MOT...." Read more

"...regulates the amount of current flowing to your device, but does NOT regulate voltage...." Read more

4 customers mention0 positive4 negative

Customers are dissatisfied with the internals of the precision measuring device. Some mention that the internal components melted or burned out.

"...It was blown. I replaced it and the unit works just fine. I truly appreciate the assistance and time you spent in working with me...." Read more

"...After 30 minutes the device failed. The internals melted and when I turned the knob to try to adjust the output, the knob spun freely without any..." Read more

"...Nothing burnt up, but I suspect it got too hot, and a protection circuit engaged or something." Read more

"...with out a load but as soon as the work load is added it burns out the 10 amp fuses that are soldered on the circuit board...." Read more

Poor Quality
1 Star
Poor Quality
Controller shorted as soon as it was plugged in (as seen in photo). Found two blown 10 amp fuses soldered to circuit board were shorted. Ten amps was not enough to run the connected motor. Not sure how this could be rated at 4000 w. Did not contact manufacturer. Disposed of it. Did not suit my needs.
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Top reviews from the United States

Lacheur
5.0 out of 5 stars Cheap, simple, works.
Reviewed in the United States on August 3, 2018
Verified Purchase
I used this plus a $5, 50 amp rectifier to power a treadmill motor. It works perfectly. Can't speak to the longevity but it works well, and runs cool (with no load). I suspect many of the bad reviews of this item are because people are plugging it in while it's set to a high output. If it's connected to a motor without overcurrent protection this will generate short but huge pulses of high amperage, which are probably what's killing the board.

Ramp it up slowly, and never turn it on under load, and I think it should work well.

Note! A multimeter will only work if testing WHILE UNDER LOAD. If you just measure the output with no load, it looks like it's passing the full AC voltage.
9 people found this helpful
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Tony
1.0 out of 5 stars Can't beat this unit for the price. Doesn't provide full torque at low RPM's
Reviewed in the United States on April 9, 2015
Verified Purchase
9/20/18
I looked at the board using a thermal camera and at just 2200 Watts the components were getting over 240F. There's NO WAY this unit will work with a 10kW load. It has worked for a long time controlling a shop vac so its okay for that but I dropped this from 5 stars to 1 star because they are basically lying to customers by advertising this as a 10kW unit.

7/2016 update...
I'm using another one to control my shop vac. It's nice to not have so much noise when I don't need the full flow rate. This product works great.

I'm using this to control the speed of a 1200 Watt vacuum cleaner motor. I haven't run it for long but so far it gives me great speed control all the way from a few rpm to 24,000 rpm. I'm pleased with the initial performance.

I also used it as a speed control it for a 1/2 HP blower motor for a project at work. It worked well although it's a little harder to get precise control of rpm with that motor. It still works great for the purpose I'm using it for.

If you want to maintain high torque at lower rpm then you should use a variac. A variac maintains the sine wave but just reduces the amplitude. That allows you to maintain higher torque at lower speeds. If you just want to adjust speed or temperature then this device works fine for a much lower cost.

I like the protective case and the leads also have a nice rotating cover that prevents the lead screws from being exposed after you connect the wires. That's worth an extra $10, in my opinion.

The only issue I have is that they don't remove the plastic protective covering on the sheet metal. Since this is rated for 3000 Watts I'm pretty sure that plastic could easily melt if not catch on fire. That should be removed at the factory. If you plan to use yours with enough power to heat the case up you might want to consider removing the blue plastic covering. You can see it in the product photo here on Amazon (at least you can as of 4/9/15)
10 people found this helpful
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Raleigh man
4.0 out of 5 stars Looks Good but Could be Improved
Reviewed in the United States on December 15, 2015
Verified Purchase
It is premature for me to rate this product as I have not put it to use yet but here are a couple of observations I will make now. Later, there will be an update on functionality and usefulness for the application I have in mind. I purchased a heating pad to be sandwiched between two 1/4" plywood sheets for a dog house floor heater. The problem is the heating pad is off or on without any temperature control adjustment. This “AC regulator” appears to fit the bill in that it will provide (hopefully) control over the AC current flow into the pad so that the temperature of the dog house floor can be maintained at a comfortable level for Spanky, the English bull dog who loves heat.

Design wise, the unit appears to be well built in terms of its build quality but I have one or two criticisms about its design. First, input and output AC terminals are presented without grounding terminals for 3rd wire ground. Also, I wish the AC input was designed like most electrical devices (with either a hard wired power cord or at least a recessed power plug that would receive a device power cord. An example is the plug on the back of a desktop computer that accepts a power cord for connecting the desktop to AC power. Finally, the output of this device should, in my opinion, have been presented as an outlet instead of terminals on a terminal board, for convenience. Admittedly, I chose this device based on accurate photo(s) of it so it was not misrepresented on Amazon. My comments are in the context of suggestions, not complaints.
3 people found this helpful
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Peppi Turco
5.0 out of 5 stars WE HAVE ARRIVED INTO A NEW ERA OF BUSINESS
Reviewed in the United States on July 1, 2013
Verified Purchase
Dear DROK and AMAZON

Even though I couldn't see the status of the fuse from the outside, I opened it up and pulled it out. It was blown. I replaced it and the unit works just fine. I truly appreciate the assistance and time you spent in working with me. You can bet I will be buying more of the unique items from your site.

And to quote what I had said in a previous Amazon Marketplace product:

WE HAVE ARRIVED INTO A NEW ERA OF BUSINESS

This dealer, "DROK" has bent over backwards to please me. And when it all came out, the product was perfect with a new fuse and I hope the seller and Amazon Marketplace don't create a ton of bad marks on me as a buyer.

As I had said in a different product and different dealer:

We are coming out of a century old phase of "sell it, even if it's broke and refuse a refund" It is quite shocking to find business y caring about the satisfaction of the customer, which of course, keeps them coming back and word of mouth and internet praise.

So, in two words:

"Shockingly Pleased!"

Sincerely,
Peppi Turco
3 people found this helpful
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John Doe
5.0 out of 5 stars Need to hook up load.
Reviewed in the United States on August 22, 2019
Verified Purchase
Works like a champ. The first one I ordered appeared to be malfunctioning. I hooked it up and was expecting a voltage reading at the output. I was getting 0V on the meter. I notified seller and they promptly sent me a replacement.
What I didn't know is that if no load is attached the output will read zero, but once I hooked up the motor the speed controller did its job. I was suppose to return the defective one but I'm keeping both since both are good units, I was just not doing it properly.
2 people found this helpful
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Top reviews from other countries

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Andrel
5.0 out of 5 stars Works very well
Reviewed in Canada on December 27, 2020
Verified Purchase
Love this product. Easy to connect and it keeps cool under load. i'm using it with a load of 1800 watts currently and no issues at all.
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Efrain G
5.0 out of 5 stars Dimmer pequeño y funcional
Reviewed in Mexico on March 14, 2019
Verified Purchase
dimmer funcional a 4000 watts max , soporta cargas de 2000 watts durante 8 horas seguidas, ojo no trae disipador pero se le puede adaptar para mejorar su desempeño
2 people found this helpful
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bryan
4.0 out of 5 stars Read the limits
Reviewed in Canada on February 6, 2020
Verified Purchase
It worked well for a few minutes but I over loaded it. Cannot blame the device it was all me. Seems to be good construction, small size if that's what You need
One person found this helpful
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KENNETH J KNIGHT
5.0 out of 5 stars I returned this b/c it was unable to run as described
Reviewed in Canada on December 29, 2023
Verified Purchase
Very light weight good for small motors only.
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Amir Mazinani
1.0 out of 5 stars Not what they advertised!
Reviewed in Canada on June 23, 2019
Verified Purchase
It said for 4kw, but the fuse is 10 amp (1kw)
And it blew up. Maybe more components blew up too!
One person found this helpful
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