Introduction

All tables in this chapter are based on the operation of the motor and controller in the same ambient temperature, 40 °C (104 °F) or less.

• Always make sure that the correct thermal units are installed in the starter before operating the motor.

• Each thermal unit should be installed with its catalog number visible.

• For melting alloy thermal units, the ratchet wheel must engage the pawl assembly.

See Thermal Unit Selection on an Approximate Basis—Based on Horsepower and Voltage for more information on installing thermal units.