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Old 10-29-2018, 12:12 PM
Rick Kellner Rick Kellner is offline
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safety switch on variac controlled furnace

I've been reading the archives for information regarding using variac type transformers on wire melters.

One reference mentioned placing the safety switch on the lines prior to the variac, but then another one suggested wiring it in between the variac output and the furnace elements.

My intuition is that the first option would be the least problematic, but I'm starting this thread to seek further clarification. Thanks in advance for any ideas.
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Old 11-03-2018, 03:21 PM
Steve Stadelman Steve Stadelman is offline
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As long as you interrupt all the hot lines itís a moot point IMHO. My criticism is that variacs are really inefficient compared to SSRs or SCRs.
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Old 11-05-2018, 07:26 PM
Dave Bross Dave Bross is offline
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Inefficient but inexpensive to buy if you're starting out on a shoestring. Rather bulletproof too.
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