G9
Siemens Energy & Automation, Inc. 1000 McKee Street Batavia, Illinois 60510
SFIM-7002A-0901
Section G, September, 2001
Breaker Selection 3 Phase 60Hz Squirrel Cage Motors
Inverse Time Breaker
Circuit breaker trip ratings are selected in accordance with NEC 1996 article 430-52 & table 430-152 assuming motors with
locked rotor KVA Code B thru E. Lower trip ratings may be required for motors with Code A.
FLA per NEC table 430-150 1996. (Do not use to size heater coils. Use motor NP data or table on page G12.)
Above ratings are below maximum shown on Heater Coil selection charts for selected motor FLAs. Maximum ratings shown
on Heater Coil selection selection charts are not to be exceeded.
Special applications on motor may require different rating refer to proper section of NEC to size.
Do not use this chart for part winding Starters-Maximum Breaker size to be limited to 200% FLA or less, 150% for FLA greater
than 100A.
HP
0.9 15
1.3 15
1.7 15
0
2.4 15
2.7 15
3.9 15
6.1 15
1
9.0 15
11.0 20
17.0 30
2
22
35
27
45
32
50
3
41
70
52
80
62 100
4
77 125
99 150
125 200
5
144 250
192 300
242 400
6
289 450
336 600
382 600
St
ar
ter
Siz
e
FL
A
575V 60Hz
½
¾
1
1½
2
3
5
7½
10
15
20
25
30
40
50
60
75
100
125
150
200
250
300
350
400
1.1
15
1.6 15
2.1 15
0
3
15
3.4 15
4.8 15
7.6
15
1
11.0 20
14
25
21
35
2
27
45
34
60
40
70
3
52
80
65 100
77 125
4
96 150
124 200
156 250
5
180 300
240 400
302 500
6
361 600
414 700
477 800
St
ar
ter
Siz
e
FL
A
460V 60Hz
0.81 15
1.21 15
2
15
0
2.5 15
3.5 15
5
15
7.5
15
1
11.0 20
14
25
21
35
2
28
45
35
60
40
70
3
55
90
64 100
80 125
4
100 175
135 250
165 250
5
200 300
260 400
325 500
6
385 600
450 700
500 800
St
ar
ter
Siz
e
FL
A
415V 50Hz
1.3 15
1.8 15
2.3 15
0
3.3 15
4.3 15
6.1 15
9.7 15
1
14
25
18
30
27
45
2
34
60
44
70
51
80
3
66 100
83 125
4
103 175
128 200
165 250
5
208 350
240 400
320 500
403 700
6
532 800
620 1000
709 1200
St
ar
ter
Siz
e
FL
A
380V 50Hz
2
15
3.2 15
0
4.2 15
6
15
6.8 15
9.6 15
1
15.2 25
22
35
2
28
45
42
70
54
90
3
68 125
80 150
4
104 175
130 200
154 250
5
192 300
248 400
312 500
6
360 600
480 800
St
ar
ter
Siz
e
FL
A
230V 60Hz
2.4 15
3.5 15
0
4.6 15
6.6 15
7.5
15
10.6 20
1
16.7 30
24.2 40
2
30.8 50
46.2 80
3
59.4 100
74.8 125
4
88 150
114 200
143 250
5
169 300
211 350
273 450
6
343 600
396 700
St
ar
ter
Siz
e
208V 60Hz
2.5 15
3.7 15
0
4.8 15
6.9 15
7.8
15
11.0 20
1
17.5 30
25.3 40
2
32.2 50
48.3 80
3
62.1 100
78.2 125
4
92 150
120 200
150 250
5
177 300
221 350
285 450
6
359 600
414 700
St
ar
ter
Siz
e
FL
A
CB Trip
200V 60Hz
HP
½
¾
1
1½
2
3
5
7½
10
15
20
25
30
40
50
60
75
100
125
150
200
250
300
350
400
FL
A
CB Tr
ip
CB Trip
CB Trip
CB Tr
ip
CB Tr
ip
CB Trip
Summary of Contents for TIASTAR SFIM-70020
Page 63: ......
Page 64: ......
Page 65: ......
Page 66: ......
Page 67: ......
Page 68: ......
Page 69: ......
Page 70: ......
Page 71: ......
Page 72: ......
Page 73: ......
Page 74: ......
Page 75: ......
Page 76: ......
Page 77: ......
Page 78: ......
Page 79: ......
Page 80: ......
Page 81: ......
Page 82: ......
Page 83: ......
Page 84: ......
Page 85: ......
Page 86: ......
Page 87: ......
Page 88: ......
Page 96: ...4 ...
Page 100: ...5 Today and tomorrow you ll know you have the very best ...
Page 115: ...13 Siemens Energy Automation Inc ...
Page 116: ...14 Siemens Energy Automation Inc ...
Page 117: ...15 Siemens Energy Automation Inc ...