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I have no doubt that these can handle 4000 watts. I got them to control lights and at 2400 watts the unit doesn't even get warm and it has about 80-90% of the full travel of the knob that dims the lights. At 3600 watts the unit does get warm but nowhere near enough that you can't hold it and still has good range. The case is solid and has a heavy duty cable with a good grommet. The only thing I don't like is the international socket as it is a bit tight and I see it getting loose over time however if/when that time comes I will just replace it with a local variety.
Verified purchase: Yes | Condition: New
Disappointingly, this device causes 2300 watt rated angle grinder motors to run roughly when lower speed setting below 95% of maximum. Rough running will definitely cause stress on the motor, and early failure.
Verified purchase: Yes | Condition: New
Adaptor required for Aus. use -missing from shipment. Metal case not earthed. 3pin plug not to Aus. Standard. Otherwise it works.
Verified purchase: Yes | Condition: New
Just want to highlight, my unit only works when the knob is pointing on number 160 on dial and onwards. The speed control is very tricky because it has only 30 degree rotation left so it is very sensitive with the speed control.
Verified purchase: Yes | Condition: New
Only good for turning on a motor will not shut it down or slow it down waste of money and time
Verified purchase: Yes | Condition: New