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Title: 240V Variac on 120V ? Post by: KZ5A on February 16, 2014, 09:22:27 PM Is is feasible to use a 240V Variac on 120V? If so would this impact the current rating?
73 Jack KZ5A Title: Re: 240V Variac on 120V ? Post by: W2VW on February 16, 2014, 09:25:40 PM Yes, no.
Title: Re: 240V Variac on 120V ? Post by: WD5JKO on February 16, 2014, 09:39:36 PM Yes, no. Yes! I'd add though that any variac designed to buck or boost the incoming AC line has the best load regulation at the 'DOT' where it neither bucks or boosts. A 240V variac on 120V input will have reduced flux in the core, and although I'm not sure about this, I'd bet the regulation, or waveform distortion would be degraded using the 240V variac on half voltage. Jack, what do you need? I have some small to mid size dudes here in a pile... Jim Wd5JKO Title: Re: 240V Variac on 120V ? Post by: KZ5A on February 16, 2014, 09:52:14 PM Jim,
I need a 120V 10 amp "behind the panel" mounting style, the only one I have is a surface mount rear lug type. I have 240V W10H Gen Rad that I was thinking of pressing into service 73 Jack KZ5A Title: Re: 240V Variac on 120V ? Post by: WD5JKO on February 16, 2014, 10:45:49 PM Sorry Jack...all I have are a 4.5A, 7.5A, and 8.5A Variac. Only the 4.5A has a dial plate, and knob. Title: Re: 240V Variac on 120V ? Post by: Opcom on February 17, 2014, 02:24:20 AM I have a dual 120V 28A one available if you have the space. It's much bigger physically than a 10A. on the other hand, it's big enough to justify a handwheel.
Title: Re: 240V Variac on 120V ? Post by: KA2DZT on February 17, 2014, 09:40:52 AM Jim, I need a 120V 10 amp "behind the panel" mounting style, the only one I have is a surface mount rear lug type. I have 240V W10H Gen Rad that I was thinking of pressing into service 73 Jack KZ5A Most GR Variacs can be made to mount any way you need. Shafts can be made to protrude either side. Post a picture of the one you have. Fred |