Voltage Control

Dimmers only turn on with a load (your resistance wire) connected and at about the 50% level.  Then depending on brands, they can then be turned down to any where from 15%-20% up to 50% which means some brands just turn off again when turned below 50%.  Lutron can be turned down to 15%-20%.

A dimmer switch can be used with any transformer listed for sale on this web site to control the voltage output and also turn off the power to the transformer.

Rotary Dimmers by turning the knob all the way counterclockwise. Push On/Off styles will keep the dimmer setting when you push it to turn it off. This type is not recommended, especially when trouble shooting because you don't know if it is on or off unless you have an indicator light in the circuit.

These controllers are for 60Hz 110V (nominal) only so will not work in other countries using 220V or 50 Hz power.

I can no longer get these at a reasonable price. Lutron has quit making them--they were made overseas, so I will no longer carry any.  WALMART LISTS A GE DIMMER for a reasonable price and they are ALSO AVAILABLE ON AMAZON.

Here is how you connect the dimmer switch to the transformer.  Connect it in series with one of the primary winding wires.