Ducati4me

Hi, is the circuit breaker an RCD or overload type? If RCD, one or more of the elements or leads could be leaking to earth. Any electrician should have a tester for this. If overload type, with continued use they tend to get tired causing tripping and may need replacement. Your loads as mentioned by others are well within acceptable ranges but still can could cause this. Better multi box's are available but come quite expensive. Google Jackson Industries in Onehunga or they are easy to make with a little effort. Most parts are available from any electrical wholesaler including 15 amp outlets you can replace your wall sockets with. The comments about the high start up current are correct. Although most meters operate to slow to register this, resistive loads do have high inrush current, somewhere from 5 to 7 times the operating load. this is very short term, only a few cycles. this may also cause tripping. Hope it helps!