Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 9)

Chapter
1
STC Starting Torque Controller
Description The STC

Starting Torque Controller is designed for low horsepower
single-phase and three-phase squirrel cage induction motors. It is
intended to relieve the starting torque surge encountered in typical
across-the-line starting. This will provide smoother starts and
decrease downtime due to shock and vibration related problems.
The STC is a global product available in three current rated sizes: 11,
16, and 22 Amp, with voltage ranges from 100–600V, 50/60 Hz., UL
Listed, CSA Approved, and CE labeled. Its compact design makes
new installations as well as retrofitting easy. Setting the initial torque
and ramp time of the controller is accomplished with digital rotary
switches.
Figure 1.1 STC Controller (11, 16, and 22 Amps)