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Chapter 2: Electrical Installation
2.9 – Typical Motor Power at Rated Voltage
The amperage values for the Soft Starter are the maximum continuous current for the model.
The motor ratings are the nearest values for the output powers of standard squirrel-cage motors
below the unit current rating of the SR44.
The currents (amps) quoted are for 3-phase, 4-pole motors operating on 50/60Hz power supplies.
Actual currents of motors may vary by ±10% depending on size and manufacturer. Motors of
lower speeds generally draw higher currents for the same rated output. Typ10% for 6-pole
or +20% for 8-pole as compared to 4 pole motors.
Motor ratings are in kiloWatts (kW) as defined by the IEC or Horsepower (HP) as defined by the
American “National Electrical Code” and are, where possible, normal motor sizes.
2.9.1 – Chassis Size 1 Motor Power Ratings
2.9.2 – Chassis Size 2 Motor Power Ratings
NOTE: SR44 soft starters have been discontinued. Please consider SR55 soft starters as a replacements.
SR44 Chassis Size 1 Motor Power Ratings
Model
Current
(Amps)
208 Volts * 230 Volts 400 Volts 460 Volts
kW HP kW HP kW HP kW HP
SR44-9 9 1.5 2 2.2 3 4 5 4 5
SR44-16 16 2.2 3 3.7 5 7.5 10 7.5 10
SR44-23 23 3.75 5 6.3 7.5 11 15 11 15
SR44-30 30 5.5 7.5 7.5 10 15 20 15 20
SR44-44 44 7.5 10 11 15 22 30 22 30
SR44-59 59 11 15 16 20 30 40 32 40
SR44-72 72 15 20 20 25 37 50 40 50
SR44-85 85 18.5 25 22 30 45 60 45 60
SR44-105 105 22 30 30 40 55 75 55 75
SR44-146 146 37 50 45 60 75 100 80 100
* 208V applications are UL listed only as low as 196V.
SR44 Chassis Size 2 Motor Power Ratings
Model Amps
208 Volts * 230 Volts 400 Volts 460 Volts
kW HP kW HP kW HP kW HP
SR44-174 174 45 60 55 75 90 100 110 150
SR44-202 202 45 60 63 75 110 150 132 175
SR44-242 242 55 75 75 100 132 175 150 200
SR44-300 300 75 100 90 100 160 200 185 250
SR44-370 370 90 125 110 150 200 250 220 300
* 208V applications are UL listed only as low as 196V.
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019
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