Quote Originally Posted by David L Morse View Post
... the symbol for an overload heater. It is just a sensor. It's not a switch. ...
Never too old to learn something; years ago I was told this schematic element 'opened', and have never questioned it. But thinking back, I've never taken an OL apart to actually look. My bad. Again, I just get to help trouble-shoot, then point an electrician at this end.

My end is the automation - a BSME corrupted by The Dark Side. One stormy night in my youth, someone pointed me at a what appeared to be a 300lb wire bomb after detonation, and said "Fix it!" ..."What is it?" "A PLC!" ..."How do you spell that?" And there has been no escape.