"Homer J Simpson" wrote in message
news:%FmIg.21030$tP4.19147@clgrps12...

"James Sweet" wrote in message
news:06mIg.1959$pX3.924@trnddc07...

You are in the UK? Doesn't this device need 50 Hz for timing?

Some do, some digital ones use batteries as the sole power source for
the electronics though.

OP said 'Mains' unit, implying UK and AC.

I have a mains powered timer in Aus (230v 50hz) which has an internal
battery and keeps time without the mains so the electronics does not
require 50hz.
Relay operation may another thing, I have never tried to see if it would
operate without the mains available.
--
John G

Wot's Your Real Problem?