Cutler-Hammer Heater Coil Selection Charts

Magnetic Motor Control

Heater coils are rated to protect 40½°C rise motors, and open and drip-proof motors having a service factor of 1.15 where the motor and the controller are at the same ambient temperature.

For other conditions:

  1. For 50½°C, 55½°C, 75½°C rise motors and enclosed motors having a service factor of 1.0, select one size smaller coil.
  2. Ambient temperature of controller lower than motor by 26½°C (47½°F) use one size smaller coil.
  3. Ambient temperature of controller higher than motor by 26½°C (47½°F) use one size larger coil.

Ultimate tripping current of heater coils is approximately 1.25 times the minimum current rating listed in the tables.

Manual Motor Control

Heater coils are rated to protect standard 40°C rise motors, and open and drip proof motors having a service factor of 1.15 at approximately 125% of rated motor current, and where controller and motor are at same ambient.

Heater coil ranges provide for variations in all enclosure sizes and designs, including internal heating. Selection tables are not compromises or averaged values thereby providing maximum motor output and life.

For other conditions:

  1. 50½°C or 55½°C rise motor and enclosed motor having a service factor of 1.0 with protection at 115% of rated current, use one size smaller coil.
  2. Ambient temperature of controller lower than motor by: 8.5-16.7½°C (16-30½°F) use one size larger coil. 16.8-27.8½°C(31-50½°F) use two sizes smaller coil.
  3. Ambient temperature of controller higher than motor by: 8.5-16.7½°C (16-30½°F) use one size larger coil. 16.8-27.8½°C (31-50½°F) use two sizes larger coil.
Desc Type 00-1½ 2 3 4 5
A10 Open
Encl
ST-1
ST-2
ST-3
ST-4
ST-5
ST-6
ST-7
ST-8
ST-16
ST-16
A30 Encl ST-9 ST-3 ST-6 ST-8 ST-16
A40 Encl ST-9 ST-3 ST-6 ST-8 ST-16
A50 Open
Encl
ST-1
ST-2
ST-3
ST-4
ST-5
ST-6
ST-7
ST-8
ST-16
B10 both ST-1 ST-3 ST-5 ST-7
B50 both ST-1 ST-3 ST-5 ST-7
C300 both ST-1 ST-3 ST-5 ST-7
Desc NEMA Open 1
MS Series all See table
B100 Series all See table
Cutler-Hammer A10 Heater Selection Chart
For OPEN Type Cat. No. A10, A50, B10, B50, C300.

For ENCLOSED Type Cat. No. B10, B50, C300
For ENCLOSED Type Cat. No. A10, A50 For OPEN Type Cat. No. A10, A50, C300.

For ENCLOSED type Cat. No. B10, C300, A800
For ENCLOSED Type Cat. No. A10, A30, A50 For OPEN Type Cat. No. A10, A50, C300.

For ENCLOSED type Cat. No. B10
For ENCLOSED Type Cat. No. A10, A30, A50 For OPEN Type Cat. No. A10, A50, C300 For ENCLOSED Type Cat. No. A10, A50
Catalog Number Table ST-1 Table ST-2 Table ST-3 Table ST-4 Table ST-5 Table ST-6 Table ST-7 Table ST-8
Starter Size - Full Load Amps
Sizes 00, 0, 1, 1 ½ Size 2 Size 3 Size 4
H1101
H1102
H1103
H1104
H1105
.167-.187
.188-.210
.211-.237
.238-.266
.267-.298
.155-.173
.174-.195
.196-.220
.221-.247
.248-.278
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
H1106
H1107
H1108
H1109
H1110
.299-.334
.335-.376
.377-.422
.423-.474
.475-.532
.279-.310
.311-.349
.350-.391
.392-.441
.442-.495
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
H1111
H1112
H1113
H1114
H1115
.533-.598
.599-.672
.673-.757
.758-.855
.856-.959
.496-.555
.556-.624
.625-.703
.704-.795
.796-.895
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
H1116
H1117
.960-1.07
1.08-1.21
.896-.999
1.00-1.12
-
-
-
-
-
-
-
-
-
-
-
-
H1018
H1019
H1020
H1021
H1022
1.22-1.35
1.36-1.52
1.53-1.70
1.71-1.90
1.91-2.10
1.13-1.25
1.26-1.41
1.42-1.58
1.59-1.77
1.78-1.96
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
H1023
H1024
H1025
H1026
H1066
H1027
2.11-2.33
2.34-2.62
2.63-2.93
2.94-3.27
3.28-3.64
3.65-4.06
1.97-2.17
2.18-2.44
2.45-2.72
2.73-3.04
3.05-3.38
3.39-3.73
-
-
-
-
-
3.72-4.10
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
H1028
H1029
H1030
H1031
H1032
4.07-4.55
4.56-5.03
5.04-5.59
5.60-6.25
6.26-6.92
3.74-4.18
4.19-4.63
4.64-5.15
5.16-5.68
5.69-6.30
4.11-4.59
4.60-5.07
5.08-5.65
5.66-6.29
6.30-7.00
3.86-4.31
4.32-4.77
4.78-5.31
5.32-5.90
5.91-6.55
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
H1033
H1034
H1035
H1036
H1037
6.93-7.75
7.76-8.63
8.64-9.59
9.60-10.6
10.7-11.9
6.31-7.05
7.06-7.76
7.77-8.63
8.64-9.51
9.52-10.5
7.01-7.82
7.83-8.79
8.80-9.67
9.68-10.8
10.9-12.0
6.56-7.33
7.34-8.15
8.16-9.00
9.01-10.1
10.2-11.2
-
8.32-9.27
9.28-10.1
10.2-11.4
11.5-12.8
-
8.24-9.19
9.20-10.1
10.2-11.3
11.4-12.7
-
-
-
-
-
-
-
-
-
-
H1038
H1039
H1040
H1041
H1042
12.0-13.3
13.4-14.7
14.8-16.6
16.7-18.8
18.9-21.2
10.6-11.8
11.9-13.1
13.2-14.8
14.9-16.7
16.8-18.9
12.1-13.4
13.5-14.9
15.0-17.6
17.7-19.0
19.1-21.5
11.3-12.5
12.6-13.9
14.0-15.7
15.8-17.5
17.6-19.8
12.9-14.3
14.4-16.0
16.1-17.8
17.9-20.3
20.4-22.9
12.8-14.1
14.2-15.8
15.9-17.7
17.8-20.1
20.2-22.7
-
-
-
-
20.6-23.3
-
-
-
-
20.6-23.3
H1043
H1044
H1045
H1046
H1047
21.3-23.9
24.0-27.0
-
-
-
19.0-21.3
21.4-24.1
24.2-27.0
-
-
21.6-24.5
24.6-27.9
28.0-32.0
32.1-36.6
36.7-41.8
19.9-22.3
22.4-25.4
25.5-28.7
28.8-32.5
32.6-36.6
23.0-26.0
26.1-29.5
29.6-33.5
33.6-37.8
37.9-42.8
22.8-25.5
25.6-28.9
29.0-32.5
32.6-36.7
36.8-41.0
23.4-26.3
26.4-30.8
30.9-34.0
34.1-38.3
38.4-43.4
23.4-26.0
26.1-30.5
30.6-33.6
33.7-37.9
38.0-42.9
H1048
H1049
H1050
H1051
H1052
-
-
-
-
-
-
-
-
-
-
41.9-45.0
-
-
-
-
36.7-41.0
41.1-45.0
-
-
-
42.9-48.5
48.6-55.1
55.2-62.3
62.4-69.5
69.6-79.1
41.1-46.0
46.1-51.8
51.9-58.6
58.7-64.6
64.7-72.7
43.5-49.3
49.4-55.8
55.9-63.1
63.2-70.4
70.5-79.9
43.0-48.2
48.3-54.6
54.7-61.2
61.3-67.6
67.7-75.9
H1054
H1055
H1056
H1057
H1058
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
79.2-90.0
-
-
-
-
72.8-83.1
93.2-90.0
-
-
-
80.0-91.7
91.8-105
106-121
122-135
-
76.0-87.1
87.2-97.5
97.6-109
110-122
123-135
Heaters for A200 or B100 Manual Starters
Motor Full-Load Current Catalog Number
1.40 - 1.54 FH19
1.55 - 1.71 FH20
1.72 - 1.89 FH21
1.90 - 2.10 FH22
2.11 - 2.32 FH23
2.33 - 2.54 FH24
2.55 - 2.79 FH25
2.80 - 3.07 FH26
3.08 - 3.36 FH27
3.37 - 3.68 FH28
3.69 - 4.03 FH29
4.04 - 4.40 FH30
4.41 - 4.81 FH31
4.82 - 5.26 FH32
5.27 - 5.74 FH33
5.75 - 6.26 FH34
6.27 - 6.83 FH35
6.84 - 7.45 FH36
7.46 - 8.11 FH37
8.12 - 8.81 FH38
8.82 - 9.58 FH39
9.59 - 10.40 FH40
10.41 - 11.30 FH41
11.40 - 12.20 FH42
12.30 - 13.50 FH43
13.60 - 14.90 FH44
15.00 - 16.00 FH45
16.10 - 17.10 FH46
17.20 - 18.30 FH47
18.40 - 19.70 FH48
19.80 - 21.20 FH49
21.30 - 22.80 FH50
22.90 - 24.50 FH51
24.60 - 26.40 FH52
26.50 - 28.50 FH53
28.60 - 30.80 FH54
30.90 - 33.30 FH55
33.40 - 36.00 FH56
36.10 - 38.90 FH57
11.90 - 13.00 FH68
13.10 - 14.30 FH69
16.00 - 17.40 FH71
17.50 - 19.10 FH72
19.20 - 21.10 FH73
21.20 - 23.20 FH74
23.30 - 25.60 FH75
25.70 - 28.10 FH76
28.20 - 30.80 FH77
30.90 - 34.50 FH78
34.60 - 38.20 FH79
38.30 - 42.60 FH80
42.70 - 46.00 FH81
47.00 - 51.00 FH82