This is a latching SPDT switch. It
attaches externally the the stand-
Common - Black
off type flag level gauge. The
N/O Blue
internal float is equipped with a
N/C Brown
huge magnet. As the float travels
Grd. Yellow
past the switch (lifted by the
process inside the tank) the switch
will change states. It will hold that
state until the float returns past the
switch. As the float goes past - the
switch will return to its original
state.