LEESON Chassis Mount SCR Control - Manual (Page 23)

17 Installation SPEEDMASTER™ OPERATION MANUAL
Power input
Connect the AC line power leads to PCB terminals L1 and L2, or
to a double-throw, single-pole master power switch
(recommended). The switch should be rated at a minimum of
250 volts and 200% of motor current.
Line fuse
Wire an external line fuse between the stop switch (if installed)
and the L1 terminal on the PCB. An additional line fuse should
be installed on L2 if the input voltage is 230VAC. The line
fuse(s) should be rated at 250 volts and 150 - 200% of
maximum motor nameplate current. Refer to the line fuse chart
on page 14 for fuse ratings.