holes in the top of consumer units

[Phoenix]

Don't know if any of you have come accross the more recent MEM 3 phase db's with a semi-rotary main isolater. Once the cover is on and the isolator is on, the lever rotates round and stops the cover coming off, but just by pure luck you can lift the lever up just enough before it starts to latch to remove the cover. Wonder why? maybe because if it did switch off when removing the cover they wouldn't sell any??

I prefer to pop the flap off the little lever and undo the screw which holds it on