210704-1559 EDT
I do not understand why so many electricians have no clue about logic, relays, and electrical circuits in general.
The GE RR system has some real advantages, but today the components are way over priced, and the toggle switches have been redesigned for looks instead of function.
Fundamentally the RR relay is a mechanically bistable unit with good AC current and voltage capability. Set and reset are controlled from two low voltage, 24 V or so, electrically isolated from the switched contact, and momentarily energized relay coils.
In many respects this type of switch has advantages over a solid-state switch. The RR really is a set of silver, or alloy, contacts. Thus, a low voltage drop on the power side switching contacts. Possibly not too many millivolts. I need to measure this sometime. There is no input power required to maintain either the on or off state. For most cases high voltage transients on the power lines do not damage the relay. Stranded #20 copper wire can be used over fairly long cable lengths for relay control.
All sorts of logical operations easily can be performed for relay control. You can have a single switch provide on-off control of one load, and still have that load controlled by another single switch that controls many separate circuits.
The RR relay can be located at a single load point. That means relays are scattered all over the place. Or many relays can be located in gang boxes. This is the approach I like. I have 7 gang boxes distributed around my home and garage, Dimming an be on either the input or output side of an RR relay is possible with a standard dimmer. There is virtually no leakage current thru the RR contacts when off.
By contrast solid state relays are not generally bistable. Quite likely have voltage drops around 1 V or more relatively independent of load. Quite limited by ambient temperature, as well as being major heat sources. Easily damaged by transient line voltages.
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