On May 30, 3:17*am, harry wrote:
There are switches and there are relays

As you noted below, a relay is a type of switch.

Relay switch makes no sense
except that it may mean a switch that operates a relay.

The word "relay" in the term "relay switch" is descriptive, like
"combination lock". You could argue that the word "switch" is
redundant in any vaguely electrically related context.


Meanwhile, in case no one has mentioned it yet, many of what are
normally referred to as relays or contactors today are actually solid
state devices.