GU10 lamp holder screwfix: G lamp types is a plug-in, U lamp part of a U-shaped, followed by numbers that light foot hole center
Distance of 10mm, GU10 is the most common, of course, there are many other lamp, such as: GX6.35, GY9.5, GY6.5 GX16D, etc.
GU10 lamp holder screwfix: “GU” at the beginning for our daily use of the bayonet. GU: “G” means lamp holder type is a plug-in, “U” means lamp is U shape, the “10” shows the center distance of lamp foot holes (mm).
MR16 lamp holder screwfix: “MR” means Multiface reflect, many sided reflection (cup), “16” means bulb caliber (the unit is 1 / 8 inch),the caliber of MR16 socket:16×1/8=2 inch≈50mm, “MR” is the push-in lamp holder,two pins, usually use for the halogen lamps and led lamps,it’s very convenient to install.
E27 lamp holder, E40 lamp base are refers to the ordinary screw lamp cap size, usually E27 is use incandescent lamp, E40 is bigger than e27 socket, more use for the metal halide lamp and high pressure sodium bulbs.
I have had some re-plastering and re-decorating work done in my kitchen. I had a new light fixture installed which takes 6 GU10 type bulbs. When the light fixture was first installed I placed 6 LED bulbs into it. The bulbs are Aurora branded and consume 7W of power each.
When I switch on the light it trips out the power on the Residual Current Detector (RCD) in my house. We assumed the problem was with the old wiring – perhaps it got damaged when the work was being done. So we ran a new wire to the fixture from a new light switch.
Definitely sounds like faulty bulbs. The LEDs ought to consume less power than the halogens they are replacing (which typically consume 20-50W each in GU 10 size), and since you said you can run the fixture with all six halogens installed with no problem, your problem is not simply that six 7W LEDs were too much for your circuit in combination with all the other loads.
See if you can isolate the problem to one specific bulb out of the six by only installing one bulb at a time. It could be a short in one of the bulbs due to a manufacturing defect.