stubuzz Posted July 15, 2021 Share Posted July 15, 2021 I seem to remember that these Tomzn units were discussed some time ago. The video shows what the insides are like. https://www.youtube.com/watch?v=FQXecTM8yuo 2 Link to comment Share on other sites More sharing options...
impulse Posted July 15, 2021 Share Posted July 15, 2021 I love bigclive teardowns and reverse engineering. Link to comment Share on other sites More sharing options...
Crossy Posted July 15, 2021 Share Posted July 15, 2021 No real surprises in there, the MOV does look a little small for the 10/20kA rating but it is naked and the other PCB mounted ones I've seen are coated which would disguise the actual size of the active element. Heating the overheat protection with a soldering iron isn't really a fair test. When they trip in real life only a very thin layer of the "solder" around the hot bit melts and the joint pings apart leaving almost a socket in the unmelted bit. I don't have one that's actually tripped to take a photo. Link to comment Share on other sites More sharing options...
stubuzz Posted July 16, 2021 Author Share Posted July 16, 2021 Why are they offered in 2 voltages- 275 and 385v ? https://www.aliexpress.com/item/32268052079.html?spm=a2g0o.productlist.0.0.3d9965d3fKjF10&algo_pvid=c71cc7ce-f73f-46a2-8852-54ee4bc328cb&algo_exp_id=c71cc7ce-f73f-46a2-8852-54ee4bc328cb-3 Also, are 2 poles really necessary as they also sell 1p units. https://www.aliexpress.com/item/4000169115438.html?spm=a2g0o.productlist.0.0.3d9965d3fKjF10&algo_pvid=c71cc7ce-f73f-46a2-8852-54ee4bc328cb&algo_exp_id=c71cc7ce-f73f-46a2-8852-54ee4bc328cb-0 Link to comment Share on other sites More sharing options...
Crossy Posted July 16, 2021 Share Posted July 16, 2021 275V for single phase, phase-N (TNC-S) or phase-N+E (TT), 385V for 3-phase, phase-phase. 2 pole for TT systems (it never hurts even if TNC-S, gives you a spare cartridge). Link to comment Share on other sites More sharing options...
stubuzz Posted July 16, 2021 Author Share Posted July 16, 2021 Thanks. Link to comment Share on other sites More sharing options...
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