Exactly. Something where you can safely touch the terminals without getting buzzed, and that doesn't have the energy to blow up in your face if you short it. I actually use a 24VAC 45VA transformer to supply a Variac (even though it is rated for 0-130VAC) to power my hot wire cutter. It's just a transformer, so you can always feed it low voltage AC, and in my case, that means that if the wire breaks, I don't get zapped.
For 0-140V, you would use terminals 4 & 5 for 120V line in, and 4 & 3 for 0-140V out for CW knob rotation.
Keep in mind that this has a 10A limit. If you run it over 10A for too many seconds, you will let the smoke out. I would suggest using something like this with it rather than (or in addition to) a fuse:
A fuse or some sort of protection on the output is useful to prevent overloads. Since it is a type of transformer you can get lots more current out (at lower voltage) than the current at the input. For intermittent use going to the 10A limit is ok. I always try to derate for any long term use - something like 50 - 75% of the rating.
No. This is an auto transformer, and not an isolation transformer. This is only one coil, so the current in the coil is the current you are concerned with, and that's that. It's not like there's an input and output coil with different currents. In an auto transformer, there is a common connection between the input and output (terminal #4 in this case) that carries a good deal of the load without ANY current at that point passing through the coil.
I suggest you read up on this a bit... If the output is set to 50% of input the output current will be about twice the input current - input power is approximately equal to output power so the currents must be different. An output fuse will protect the wiper. If you look at the link to the manual that someone earlier posted on the first page under precautions it states to fuse the output. Also see page 10 on this link that recommends an input and output fuse:
You got a great deal! Where I work once had a box like that which included an isolation transformer on every workbench. They decided to pitch them and I now have one for home use.
Just an ole dog trying to learn new tricks, lol.I suggest you read up on this a bit... If the output is set to 50% of input the output current will be about twice the input current - input power is approximately equal to output power so the currents must be different. An output fuse will protect the wiper. If you look at the link to the manual that someone earlier posted on the first page under precautions it states to fuse the output. Also see page 10 on this link that recommends an input and output fuse:
https://www.stacoenergy.com/images/...st-sets/stacovt/brochure/designengine_bro.pdf
I was amused by a recent post I saw on another site where someone said they posted their question and then, under a different user name, posted a wrong answer. Their theory was that many people liked to correct others more than help others so this increased their chance of getting responses... My observations tend to support this...
