On Wed, 27 Nov 2019 09:39:25 -0800, wrote:

Surge Protectors are designed to work on incoming power. Depending on
the design, they are far less effective with outgoing surges. And, if
you have, in fact, a drop in voltage due to a hard-start, the will have
no effect at all.

It's more likely a spike from the motor current being suddenly shut-off.
Remember motors are reactive components.



--
This message may be freely reproduced without limit or charge only via
the Usenet protocol. Reproduction in whole or part through other
protocols, whether for profit or not, is conditional upon a charge of
GBP10.00 per reproduction. Publication in this manner via non-Usenet
protocols constitutes acceptance of this condition.