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Motor Synchronous Speeds (RPM)

 

Frequency Number Of Poles
2 4 6 8 10 12 14 16 18
60-cycles 3600 1800 1200 900 720 600 514 450 400
50-cycles 3000 1500 1000 750 600 500 428 375 334
 

 

As a "rules of thumb" amps horsepower rating can be estimated as

Always check nameplate information before designing protective devices, wiring and switchgear.

 

Single-Phase Motors - HP and Full-Load Currents

 

Motor Size 

(hp)

 Full Load Current (Amps)
115 V 208 V 230 V
1/6 4.4 2.4 2.2
1/4 5.8 3.2 2.9
1/3 7.2 4.0 3.6
1/2 9.8 5.4 4.9
3/4 13.8 7.6 6.9
1 16 8.8 8
1 1/2 20 11 10
2 24 13.2 12
3 34 18.7 17
5 56 30.8 28

 

Three-Phase Motors - HP and Full-Load Currents

 

Motor Size

(hp)

 Full-Load Current (Amps)

Induction Type

Squirrel-Cage and Wound Motor

Synchronous Type

Unity Power Factor
115 V 230 V 460 V 575 V 2300 V 230 V 460 V 575 V 2300 V
1/2 4 2 1 0.8          
3/4 5.6 2.8 1.4 1.1          
1 7.2 3.6 1.8 1.4          
1 1/2 10.4 5.2 2.6 2.1          
2 13.6 6.8 3.4 2.7          
3   9.6 4.8 3.9          
5   15.2 7.6 6.1          
7 1/2   22 11 9          
10   28 14 11          
15   42 21 17          
20   54 27 22          
25   68 34 27   53 26 21  
30   80 40 32   63 32 26  
40   104 52 41   83 41 33  
50   130 65 52   104 52 42  
60   154 77 62 16 123 61 49 12
75   192 96 77 20 155 78 62 15
100   248 124 99 26 202 101 81 20