[Healeys] Lucas 6RA Relays

[Michael Salter]

One for the electrical geniuses.
As I sort my way through my boxes and boxes of electrical parts I  keep
coming across Lucas 6RA relays. These are the ones in the little steel box
with the bracket on the back with 2 mounting holes.
Ignoring those with more than 4 terminals I must have at least 15 different
Lucas part numbers for what appears to be the same relay.
All are 12 volt and all have 4 terminals
W1 & W2 which are the coil (winding) and C1 & C2 which are the contacts ...
like what get switched.
A couple are normally closed contracts (NC) but the vast majority are
normally open (NO).
I have checked the continuity between the various terminals and in all
cases the C terminals are isolated from the W terminals and all terminals
are isolated from the steel enclosure.
I've opened a few up and,  internally,  as far as I can tell, they appear
to be virtually identical.
So ... to my question ... why all the different part numbers, as I
understand it these things are essentially an electrically operated switch,
what can be so different between them that they need to have so many
different part numbers?
Perhaps I should also mention that Lucas is very particular in requiring a
specific part number for each application... what am I missing.
Please avoid comments referring to the long Canadian winter  ... they make
my wife angry ... she's a local and they get a bit sensitive when such is
mentioned 😊

M
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