Product Manual

Capacitor Start motors are designed in both moderate and high
starting torque types with both having moderate starting current, high
breakdown torques.
Moderate-torque motors are used on applications in which start-
ing requires torques of 175% or less or on light loads such as fans,
blowers, and light-start pumps. High-torque motors have starting
torques in excess of 300% of full load and are used on compressors,
industrial, commercial and farm equipment. Capacitor start motors use
a start capacitor and a start switch, which takes the capacitor and start
winding out of the circuit when motor reaches approximately 75% of its
operating speed.
Capacitor Start/Capacitor Run motors have applications and
performance similar to capacitor start except for the addition of a run
capacitor (which stays in circuit) for higher efficiency and reduced running
amperage. Generally, start/ capacitor run motors are used for 3 HP and
larger single-phase applications.
-16-
On industrial duty motors,
capacitors are usually
protected by metal cases
attached to the motor
frame. This
capacitor start/capacitor
run motor has two cases.
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Cap start circuit diagram