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Isolation Transformer, Variac and Dimmer Bulb Tester
Isolation Transformer, Variac and Dimmer Bulb Tester
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Old 13th August 2018, 03:00 AM   #11
Refugee1 is offline Refugee1  United Kingdom
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It is normal practice with variac power supplies to fuse the output.
It is the most commonly overlooked thing and cause of burn-ups.
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Old 13th August 2018, 03:06 AM   #12
rayma is offline rayma  United States
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Quote:
Originally Posted by anatech View Post
I've never seen a variac fused in the adjustable output. But I would assume that the pegged meter
and loud hum would be hint enough to shut it down. There wouldn't be any harm in fusing both locations.
In our lab, students (who should have know better) have blown many Variacs by not fusing
the wiper outputs. This includes $6000. high current three phase Staco variable autotransformers,
the kind that stack several parallel sections per phase. The damage happens very fast, with no time
to turn it down, especially since the "knob" is a 15" diameter round wheel that takes both hands
to be able to turn at all. Some types of these are motor driven, and it takes a couple of minutes
to go all the way up or down.

Last edited by rayma; 13th August 2018 at 03:15 AM.
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Old 13th August 2018, 03:39 AM   #13
anatech is offline anatech  Canada
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Isolation Transformer, Variac and Dimmer Bulb Tester
It makes sense to fuse the output of the variac. I have one commercial unit that has breakers on both input and output. The others were unfused.

-Chris
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Old 13th August 2018, 09:19 AM   #14
DF96 is offline DF96  England
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To answer the original question, I would use mains-isolation-variac-lamp-load as the order.
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Old 13th August 2018, 02:08 PM   #15
anatech is offline anatech  Canada
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Hi DF96,
Why would you use the lamp? It defeats the autotransformer and may cause things to act really weird. I would suggest that the lamp is an either or thing with the variac.

-Chris
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Old 13th August 2018, 10:47 PM   #16
TonyTecson is offline TonyTecson  Philippines
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Isolation Transformer, Variac and Dimmer Bulb Tester
a variac is handy when you want to test equipment rated for 100 volts or any other voltage..

when testing for magnetizing currents, you can test using voltage from 0 to rated and above rated voltages...this is how i use my variac..

variac can also be used in livening up old unused vintage gears, performing capacitor reforming at the same time...
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Old 14th August 2018, 12:23 AM   #17
anatech is offline anatech  Canada
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Hi Tony,
Quote:
variac can also be used in livening up old unused vintage gears, performing capacitor reforming at the same time...
Yes, I also do that with a variac. Often I'll slow start unknown condition units also. That way you can prevent doing more damage to a damaged circuit.

I have zero use for a light bulb type current limiter. I need to know how much voltage is applied and at what current. The light bulb limiter is just one big question mark for me.

-Chris
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Old 14th August 2018, 12:29 AM   #18
rayma is offline rayma  United States
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Quote:
Originally Posted by BassNoid View Post
Isolation Transformer, Variac and Dimmer Bulb Tester, I have all three.
One more thing, make sure that you know the actual voltage output of the Variac.
Some can boost the input voltage by a substantial amount, depending on how they are wired.
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Old 14th August 2018, 12:33 AM   #19
TonyTecson is offline TonyTecson  Philippines
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nowadays, the series lamp tester gets called more often...
Attached Images
File Type: jpg lamp tester.jpg (72.2 KB, 18 views)
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