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Old 03-09-2017, 09:40 PM   #1
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this may be a stupid ? but can the above be used to start electric motors? know you need overloads.but can they be used as starters for motors if they are rated for the load?
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Old 03-09-2017, 10:03 PM   #2
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Short answer: Yes

Eons ago mercury contactors were used as starters and contactors for many things. In the past they were used a lot on industrial heating applications because of their long contact life in high cyclic use.

Is this something existing or did you find something in the junk pile? I have not seen any new mercury contactors in years. Solid state relays have taken their place in heating applications. VFDs and soft starts have taken over their use for motor control.
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Old 03-09-2017, 10:16 PM   #3
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Any applications for mercury relays I have seen were OLD. I would think any new applications would be closely regulated.
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Old 03-09-2017, 10:17 PM   #4
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I've seen them used about decade ago in pizza ovens at Little Caesars pizza.
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Old 03-09-2017, 10:19 PM   #5
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thanks for the quick reply varmit!also thanks bird dog,& brian john wellllll! i found these at the junk yard , bought them for about 35 cent a pound.think i paid less than $10 for 7 of them. they were running some heating elements.love to frequent the yard.bought an 80 gallon air compressor for $135. had motor , compressor,& tank. need to add a few things.he had had it for a while, wouldn't let it go. so i kept asking. he give in finally & said"what parts do you want?"i said all of it, all 293#'s of it.just gotta add a few parts.
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Old 03-09-2017, 11:02 PM   #6
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The reason you were able to buy them so cheap is because you have to pay to dispose of them. Mercury is highly highly toxic and concentrates in the environment. It's banned in most countries, but not here, yet here if you have it and want to get rid of it, you must take it to a hazmat disposal site and pay. Your seller found an alternative...he kicked the can down the road to you.
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Old 03-09-2017, 11:55 PM   #7
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your most likely right, but i noticed there still widely avaliable. seem to be used a lot. also see they have been outlawed in a lot of states. know mercury is very hazardous , but so are other things. if handled correctly not so bad.
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