What is the model number of the panel with the switch disconnector.
Check at the sides of the switch. There are probably wee holes on the vertical switchguard. These take the prongs of a lockout, in which you will put a padlock. Not sure the dimensions but an MCB lockout may or may not fit. You should be able to get an MCB lockout from a large electrical wholesaler. I say "should" but locking out is not a strong point of electrical contractors, who prfer to use bits of tape to protect themselves, colleagues and property so there may nt be damand for the wholesaler to stock . The main branches in cities are usually open Saturday mornings. Reece safety will do a lockout for just about anything.
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