No Voltage Release switch "NVR"

You can make up something similar with a contactor with holding contacts and a single-push reset switch. Contactor is started by closing the single-push reset switch, holding contacts hold it on (!) if the supply fails it will not close on supply restoration unless the reset switch is pushed.

A lot of motor starters have this feature as standard.

Peter

-- Peter A Forbes Prepair Ltd, Luton, UK snipped-for-privacy@easynet.co.uk

on

I know. That's what we first thought of in another group. Then someone in the UK suggested using a NVR switch. See:

Thanks Kevin