[sdiy] Polyfuse Tripping Current values

[Justin Owen]

Hey all,

Belated Christmas & HNY wishes to everyone - hope you all had good/fun/safe (or recoverable...) times.

Based on the advice I've had here I'm going to add polyfuses to this power supply breakout module I'm working on.

My Analogue Systems rack has each rail divided into 3 busses - each with a 1A fuse on, my Doepfer rack uses a single 400mA fuse on the mains transformer AFAIK.

So, first up - considering a) that I'd like to build a breakout module for each rack and b) that I've no idea what current draw the prototype circuits that might be powered off it will have - what Tripping Current should I specify for the Polyfuse to be *reasonably* safe?

...and secondly, is there a rule of thumb for specifying a Tripping Current for a circuit that I *do* know the current draw of?

Hope that makes sense. Thanks.

Justin