Variac Wiring Question

[W1RKW]

I have a variac I just picked up and was just wondering if this is this the correct method for connecting a variac for 0 to 135VAC out.  The diagram below is the schematic and pinout.  Sorry for the poor graphic.  I does look better if you view it by clicking on the image link below the image.

[KB2WIG]

                  C

[W1ATR]

Yup, correct indeed. I would put a fuse on terminal 5. If you don't want it to boost past the mains voltage, then your mains in 'hot' can be moved to terminal 1. Otherwise your good to go.

This is assuming the rotation to increase the Vout is CW ('up' in your diagram)

That's a nice variac as it can be wired to CW or CCW voltage control. Not all can do that. I have these Staco guys here (6510's I think, 25A, 0-180V) that are made for CCW voltage increase so I had to turn them around so the wiper is close to my hand.<read ZAP

[W1RKW]

I have these Staco guys here (6510's I think, 25A, 0-180V) that are made for CCW voltage increase so I had to turn them around so the wiper is close to my hand.<read ZAP

I wondered about that myself.  It seems the shaft is insulated from the rotor but I'm not sure what insulates it.  Can't see anything apparent that boosts my confidence that I won't get zapped or blow fuses yet it seems isolated even though it looks like a direct short to the frame work. 

Anyone have any nice knobs that fit a 3/8" shaft?  I could use one for this bugger.  Thanks.
Bob

[WA1GFZ]

Bob the shaft should have an insulating sleeve on it as it goes through the core.

[k4kyv]

I would put the fuse between the mains hot and the variac, just in case something shorts out internally in the variac itself.

[k7yoo]

Let me know if you don't find a knob--any particular styling preference?
I should have dug one up when I sent the variac
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[W1RKW]

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