Quote: Nogget @ 28th May 2015, 12:40 PM BSTIf I have a modern fuse box with circuit breakers, do I still need a plug-in circuit breaker for safety when using an electrical power tool?
Not necessarily, but you can use one with a lower trip current in the hope that it will trip first and so hopefully the mains trip won't activate which would/might turn off all your computers & TV sets etc abruptly with a risk of scrambling hard disk data.