I bought a magnetic polisher back in the mid 90,when we shifted and the new house had earth leakage breakers,it would trip the them,so I had to get it rewound to solve the problem.
My sewerage pump break down,and I had the same problem,kept tripping the breaker,so sent it back,got another one that solved the problem.
There is a lot asian electrical gear that does not come up to standard,so that is it.
I bought furnace from china,the electronic controls broke,so I fitted a manual control,then the element started to break so after repairing it several times the problem still persisted, I tipped it.
I have a larger furnace from the US for 25 years no problems,still works great.
The US make good furnaces.
These are the best crucibles do not crumble.
http://www.candce.com.au/index.php/...ander-clay-graphite-crucibles-detail?Itemid=0