Control Catalog

Reduced Voltage Starters Electromechanical

Section 2

CR331 Autotransformer Starters 800 Horsepower Max.@ 230V 1500 Horsepower Max. @ 600V NEMA Sizes 2-9 Three-Phase 50/60 Hz

Description These starters in a NEMA Type 1 enclosure consist of a three-leg autotransformer, three contactors (START, RUN, WYE), a pneumatic timer, a three-phase block overload relay, and an autotransformer overtemperature device. Application These automatic, closed-transition starters are for use with squirrel- cage motors where reduced starting currents or limited starting torques are required. Overload protection is provided. Common uses are for blowers, compressors, conveyors, and pump motors. Standard Features —Closed Transition : no interruption in line current during transition —Three-Leg Autotransformer : for balanced starting currents and minimum line disturbance. Starting current and torque adjustment easily made by changing autotransformer taps. —Accurate Adjustment : pneumatic timing relay permits easy adjustment of starting time on reduced voltage. —Flexibility : complete line of factory-installed modifications available. —High Torque Efficiency: provides maximum torque per line Ampere.

Typical CR331 Starter for Wall Mounting

Starting Characteristics Voltage Tap

Starting Torque

Line Current

% Full Voltage

% Normal

% Locked Rotor

100%

100%

100%

80% 65% 50%

64% 42% 25%

64% 42% 25%

Product Number Selection Instructions: See page 2-47

Rev. 4/16 Prices and data subject to change without notice

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