Hi again

I have a mac plus that trips my house power soon after it's booted.

From another thread I found that the likely culprits are the two small capacitors mounted vertically close to the power switch.

I desoldered them last night and noticed that they are cracked.

The markings on them are 4700pF 250V Y class.

I'm in Australia and there is a local component shop called Jaycar that carry this sort of stuff but I can only find X2 class caps.

Like these :  250V AC Mains - Metallised Polypropylene Capacitors - X2 10nF

Their full range of these types of capacitors is here

There are others there  with an N designation for which I have no idea what that means, e.g. 22N, 47N

I've read elsewhere that it's not good to replace Y class with X class and I don't want to blow anything up or start fires

Any advice would be greatly appreciated.