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juggler 12th October 2012 01:45 PM

IEC fuse question for Hypex amp
Noob time again...

I'm building a stereo amp with 2 x UCD180 amps and a single SMPS180 power supply and Im trying to work out what size fuse to install in the IEC connector in the UK.

Given the amps can draw twice the RMS power from the PSU and they work at around 80% efficiency, and assuming that the PSU is 80% efficient too, that suggests to me that the fuse should be
2 x 2 x 180 / (0.8 x 0.8 x 240), i.e. 5 Amps.

Is that correct? Have I got something very wrong?
Should it be a slow-blow fuse?

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