Buying this part was needed for my Bosch dishwasher but it hasn't solved the problem as the RCD still trips. I suspect due to the original contact supressor blowing up it has damaged something in the dishwasher control module from further investigation I have done. With the unit NOT plugged into the mains there is 0 ohms across live and earth and maximum resistance across earth (not what you would like). When powered the earth from the back of the module and the plug are now connected and live & neutral give 240V (as you would hope). I assume that this the correct operation of this unit before I spend £100 on the control module?