To "cut to the chase", then ... it seems to me that 3600 RPM is the "catch" (oh yes, a pun indeed).

That is, if it spins at more than 3600 revs (as they all do, surely), then it needs a "proper" lid interlock.

I hope I'm right on this (and will make a correction if I'm giving out a "bum steer")!

It has to meet all of the points below to not have a lid lock that remains lock while it is spinning, and yes it's most likely to spin faster than 3600RPM.

Hope this helps, Graham can always call me here at work.

1) Have a catch to hold it shut
2) Switch off the motor when lid opened
3) No more than 3600RPM
4) Rotor Energy no more than 1kJ
5) No more than 2000xg
6) Rotor radius no more than 25cm
7) Off Switch
8) See through Rotor Cover
9) If you can open it at more than 2 m/s it must have a sticker

Our Main Plastics Surgeon requested a Centrifuge cost £2350 which on arrival for trial was non-compliant.ie the lid continues to rotate at 3000rpm when opened. The Surgeon said that this centrifuge was the standard equipment in other hospitals where he operated, he even asks the scrub nurse to slow the centrifuge quickly by placing a finger on the spinning tube holder.
[ The patients own body matter is spun and injected into the area to be re-built ]. I arranged a demo of an MSE Kestrel at £995. job done, fully compliant with beeps. Suggest that you EBME bods scrap all of these £2600 non-compliant units and buy the £995 Kestrel..ps the Surgeon is also happy

The MSE Kestrel works best with a capped 10 ml Terumo syringe in the centrifuge, the BD syringes are too loose. After spining and settling, the settled body matter in the 10 ml is injected via a joiner, into a 5 ml syringe, which is then used to inject into the patient

... and one of the few remaining bits of kit still made in England!