On Thu, 31 Dec 2020 11:08:22 +0000 (GMT), Dave Plowman (News) wrote:

It would take a true optimist to guarantee a solid state relay will have
a longer life than a traditional one.

Depnds on the application. I doubt a traditional relay would last
long operating with a 7 Hz PWM signal to control the speed of a mains
circulating pump. Might be a tad noisy (acoustically and
electrically) as well. B-)

--
Cheers
Dave.