What is meant by RST written on three phase supply wires in circuit diagrams

Engr. Laeeq · Feb 26, 2012

Hello everyone,

What is meant by RST written on three phase supply wires in circuit diagrams?
Reply if anyone knows its abbreviation.

FvM · Feb 26, 2012

It's the same as UVW (three consecutive letters) or L1 L2 L3, just a way to tell that it's a 3-phase supply and mark the phase sequence.

v_c · Feb 28, 2012

When I saw this for the first time (many years ago), I thought the letters RST meant RESET. But I could not figure out why there were three terminals

Maybe the first was the positive, second the negative and third was a spare :-( This is almost like looking for a triangular package for an opamp ...