Quote:
Originally Posted by PsychMan
Id have thought the requirement for Class X is not as clear here, as they're primarily designed to be across the line, where a dead short can be incredibly dangerous and a fire risk.
I suppose a non class X could develop shorts over time and generate significant heat to be a mild fire risk or melt said capacitor, but if in a metal or other non flammable enclosure and the application fused as conservatively as possible this all mitigates that risk. What do you think Argus? Perhaps such a short would burn itself out?
|
A class X may develop shorts as well, most important requirement is that it shouldn't go up in flames too enthousiastically and of course that it should be rated for mains voltage. Most series are not rated for anything besides across the mains applications by their manufacturers (except of course RIFA MP, which are equally suited to produce smoke in every possible application). In any case, you should use an impulse rated polypropylene capacitor in applications like this, 1000VDC working voltage should be plenty. X2 ones (be it paper or polypropylene) will "self heal" which is in this case equivalent to self destruct.