ftg Posted November 6, 2006 Share Posted November 6, 2006 Hi there,Sorry for opening almost the same topic, but I still don't understand a thing. (wish it was only one...)Our betapacks (betapack1) have 10A fuses 500Vac.I've read the "fuses for zero 88's" topic and a Betapack 2 manual, but I coudn't see any voltage mentioned.I thought this fuse obviously should be 250V 10A, but I have asked zero 88 and they said that the 500Vac one is the proper one. (My English is one of my weaknesses so didn't dare to ask further questions coz I din't want to have a long and complately insensible conversation on the phone.)I just really would like to understand why.If anyone could explain this or can offer a good book about this topic I'd be very grateful!Thanks in advance! Link to comment Share on other sites More sharing options...
JimWebber Posted November 7, 2006 Share Posted November 7, 2006 Hi Welcome to the Blue Room! It's quite simple, the 500V quoted refers to the MAXIMUM working voltage of that fuse, it is fairly irrelevant as long as it is at least rated as high as the supply voltage. PS Your English is a lot better then some of the "English" speaking people who post on this board, don't worry about it! HTH Jim Link to comment Share on other sites More sharing options...
MarcT Posted November 7, 2006 Share Posted November 7, 2006 I suspect this is because the Betapack can be wired for a single or three phase supply. You therefore ought to have a fuse which is rated for a phase to phase short circuit. This would be 415V here in the UK, and 380V for most of Europe - so a 500V rated fuse is correct. Obviously, I'm completely ignoring the European voltage harmonisation. Marc Link to comment Share on other sites More sharing options...
eviljohn2 Posted November 8, 2006 Share Posted November 8, 2006 Hi Marc Just to jump in on this topic, I don't understand why you'd need a 3-phase suitable fuse as surely you wouldn't run any part of the dimmer outlets across phases? Link to comment Share on other sites More sharing options...
ftg Posted November 11, 2006 Author Share Posted November 11, 2006 Eviljohn2 asked one more good question which is on my list as well... and I might be wrong but if I had a 10A 500V fuse in the unit and the dimmer is always running on single phase power (240V) this fuse would let through ~20A befor it gets blown. Am I right? I still don't understand this fuse thing and especially the Zero 88 Betapack2 manual. It doesn't give me a straightforward answer or I just can't read it... Link to comment Share on other sites More sharing options...
Tomo Posted November 11, 2006 Share Posted November 11, 2006 and I might be wrong but if I had a 10A 500V fuse in the unit and the dimmer is always running on single phase power (240V) this fuse would let through ~20A befor it gets blown. Am I right?No, you are wrong.A 10A fuse will open above 10A, regardless of the working voltage. A 500V fuse is rated to break 500V - in other words, if you have a much higher voltage across it, it might not be able to open the circuit. (Ignoring the strange things at ludicrous currents) Link to comment Share on other sites More sharing options...
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