To prevent overloading the starter, do not select heater(s) for a motor of larger rating than the maximum given on the nameplate for the starter. For continuous rated motors, with a service factor of 1.15 to 1.25,select the heater with maximum motor amperes equal to or immediately greater than the motor full-load current (provides a maximum of 125 percent protection). For continuous rated motors with no service factor, multiply the full-load current of the motor by 0.90 and use this value to select the heater.
The table below should be used to determine which column of motor full load amperes applies for heater selection. Select in order, the base catalog number, the NEMA type of enclosure, and the column to be used in the proper table by NEMA size. If full-load amperes of the motor falls between two ratings, select heaters for the higher rating.
Base Catalog Number Starter/Overload Relay |
Description |
NEMA Type Enclosure |
Quantity Heaters Required |
Heater Table Column
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CR306 |
Single phase, 2 pole, Size 00-2----- Single phase, 2 pole, Size 00-2----- Single phase, 2 pole, Size 3--------- Single phase, 2 pole, Size 3--------- |
Open 1,3R, 4, 12 Open 1 3R, R, 12 |
1 1 2 2 |
A B A B |
CR306 |
3 Phase, 3 pole, 3-leg protection standard, size 00-5---------------- ambient compensated, size 00,0,1,2 &5 ambient compensated, size 3----- ambient compensated, size4----- |
0 open open open open |
0 3 3 3 3 |
C C D E |
CR306,CR307,CR308,CR387 |
3 Phase, 3 pole, 3-leg protection standard, size 00-5 ambient compensated, size 00,0,1,2 &5 ambient compensated, size 3 ambient compensated, size4 |
0 1,3R,4,12 1,3R,4,12 1,3R,4,12 1,3R,4,12 |
0 3 3 3 3 |
D C D E |
CR309 |
3 Phase, 3 pole, 3-leg protection standard, size 00-5 ambient compensated, size 00,0,1,2 &5 ambient compensated, size 3 ambient compensated, size4 |
open open open open |
3-Reverser
6-Two-speed |
C C D E |
CR309,CR310,CR311,CR390 |
3 Phase, 3 pole, 3-leg protection standard, size 00-5 ambient compensated, size 00,0,1,2 &5 ambient compensated, size 3 ambient compensated, size4 |
0 1,3R,4,12 1,3R,4,12 1,3R,4,12 1,3R,4,12 |
3-Reverser
6-Two-speed |
D C D E |
CR324 | Panel mounted | |||
All NEMA Sizes 6-9 | 3 phase, 3-leg protection, standard | |||
CR124 | Single element, panel mounted | |||
CR124 |
Single element, ambient compensated, standard and quick trip |
CR123C, CR123F Motor Starter Heaters
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NEMA SIZE 6-9
CR306HH-Size 6 Three Heaters Required |
CR386j-Size 7 Three Heaters Required |
CR386K - Size 8 Three Heaters Required |
CR386L-Size 9 Three Heaters Required |
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Maximum Motor Amperes | Heater Catalog Number | Maximum Motor Amperes | Heater Catalog Number | Maximum Motor Amperes | Heater Catalog Number | Maximum Motor Amperes | Heater Catalog Number |
197 | CR123C220A | 387 | CR123C326A | 516 | CR123C301A | 1075 | CR123C301A |
214 | CR123C239A | 461 | CR123C356A | 580 | CR123C326A | 1210 | CR123C326A |
238 | CR123C268A | 515 | CR123C379A | 690 | CR123C356A | 1440 | CR123C356A |
258 | CR123C301A | 565 | CR123C419A | 772 | CR123C379A | 1610 | CR123C379A |
290 | CR123C326A | 622 | CR123C466A | 846 | CR123C419A | 1765 | CR123C419A |
346 | CR123C356A | 688 | CR123C526A | 934 | CR123C466A | 1950 | CR123C466A |
387 | CR123C379A | 763 | CR123C592A | 1030 | CR123C526A | 2150 | CR123C526A |
424 | CR123C419A | 810 | CR123C630A | 1147 | CR123C592A | 2250 | CR123C592A |
467 | CR123C466A | 1215 | CR123C630A | ||||
516 | CR123C526A | ||||||
540 | CR123C592A |
CR123C, CR123F Panel-mounted Overload Relay Heaters
For CR324 Standard and Ambient Compensated Block Overloads - Panel Mounted |
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Three Heaters |
Three Heaters |
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Maximum Motor Full-load Amperes | Heater Catalog Number | Maximum Fuse Rating | Maximum Motor Full-load Amperes | Heater Catalog Number | Maximum Fuse Rating | Maximum Motor Full-load Amperes | Heater Catalog Number | Maximum Fuse Rating | Maximum Motor Full-load Amperes | Heater Catalog Number | Maximum Fuse Rating |
CR324C (Size 0,1) |
CR324D (Size 2) (Cont'd) |
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0.39 | CR123C054A | 3 | 3.89 | CR123C466A | 15 | 14.4 | CR123C163B | 60 | 28.0 | CR123C303B | 100 |
0.42 | CR123C060A | 3 | 4.30 | CR123C526A | 15 | 16.3 | CR123C180B | 60 | 32.1 | CR123C330B | 110 |
0.45 | CR123C066A | 3 | 4.77 | CR123C592A | 15 | 17.3 | CR123C198B | 60 | 35.9 | CR123C366B | 125 |
0.51 | CR123C071A | 3 | 5.14 | CR123C630A | 20 | 19.3 | CR123C214B | 70 | 41.5 | CR123C400B | 150 |
0.56 | CR123C078A | 3 | 5.63 | CR123C695A | 20 | 20.9 | CR123C228B | 80 | 43.4 | CR123C440B | 150 |
0.65 | CR123C087A | 3 | 6.26 | CR123C778A | 25 | 22.9 | CR123C250B | 90 | 45.0 | 150 | |
0.73 | CR123C097A | 3 | 7.15 | CR123C867A | 25 | 24.7 | CR123C273B | 90 | |||
0.81 | CR123C109A | 3 | 7.58 | CR123C955A | 30 |
CR324E (Size 3) |
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0.90 | CR123C118A | 3 | 8.39 | CR123C104B | 30 | 18.0 | CR123F233B | 70 | 44.4 | CR123F567B | 175 |
1.00 | CR123C131A | 3 | 9.11 | CR123C113B | 35 | 20.5 | CR123F243B | 80 | 48.4 | CR123F614B | 175 |
1.10 | CR123C148A | 3 | 9.67 | CR123C125B | 35 | 21.7 | CR123F270B | 80 | 52.4 | CR123F658B | 200 |
1.21 | CR123C163A | 3 | 11.0 | CR123C137B | 40 | 25.1 | CR123F300B | 90 | 57.0 | CR123F719B | 225 |
1.35 | CR123C184A | 3 | 11.9 | CR123C151B | 45 | 27.0 | CR123F327B | 100 | 64.5 | CR123F772B | 225 |
1.50 | CR123C196A | 6 | 14.3 | CR123C163B | 50 | 30.5 | CR123F357B | 110 | 68.8 | CR123F848B | 250 |
1.64 | CR123C220A | 6 | 16.1 | CR123C180B | 60 | 32.5 | CR123F395B | 125 | 75.7 | CR123F914B | 275 |
1.78 | CR123C239A | 6 | 17.2 | CR123C198B | 60 | 33.9 | CR123F430B | 125 | 86.2 | CR123F104C | 275 |
1.98 | CR123C268A | 6 | 19.2 | CR123C214B* | 70 | 38.9 | CR123F487B | 150 | 90.0 | CR123F114C | 300 |
2.15 | CR123C301A | 6 | 20.6 | CR123C228B* | 80 |
CR324F (Size 4) |
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2.42 | CR123C326A | 6 | 21.8 | CR123C250B* | 80 | 30.5 | CR123F357B | 100 | 68.6 | CR123F848B | 250 |
2.88 | CR123C356A | 10 | 23.4 | CR123C273B* | 80 | 32.5 | CR123F395B | 125 | 75.7 | CR123F914B | 275 |
3.22 | CR123C379A | 12 | 26.1 | CR123C303B* | 90 | 33.9 | CR123F430B | 125 | 86.2 | CR123F104C | 275 |
3.53 | CR123C419A | 12 | 27.0 | CR123C330B* | 90 | 38.9 | CR123F487B | 150 | 93.0 | CR123F114C | 300 |
CR324D (Size 2) |
44.4 | CR123F567B | 175 | 109.0 | CR123F118C | 350 | |||||
5.14 | CR123C630A | 20 | 48.4 | CR123F614B | 175 | 123.0 | CR123F133C | 400 | |||
5.63 | CR123C695A | 20 | 52.4 | CR123F658B | 200 | 131.0 | CR123F149C | 400 | |||
6.26 | CR123C778A | 20 | 57.0 | CR123F719B | 225 | 135.0 | CR123F161C | 400 | |||
7.15 | CR123C867A | 25 | 64.5 | CR123F772B | 225 | ||||||
7.58 | CR123C955A | 30 |
* Size 1 only
Maximum Motor Full-load Amperes | Heater Catalog Number | Maximum Motor Full-load Amperes | Heater Catalog Number | Maximum Motor Full-load Amperes | Heater Catalog Number | Maximum Motor Full-load Amperes | Heater Catalog Number |
For CR124C (Size 0,1) |
For CR124C (Size 0,1) |
For CR124D (Size 2) (Cont'd) |
For CR124F (Size 4) (Cont'd) |
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0.33 | CR123C036A | 6.83 | CR123C695A | 24.9 | 22.9 | CR123F233B | |
.37 | CR123C039A | 7.70 | CR123C778A | 27.3 | 24.8 | CR123F243B | |
.41 | CR123C043A | 8.48 | CR123C867A | 29.7 | 27.2 | CR123F270B | |
.46 | CR123C048A | 9.19 | CR123C955A | 33.2 | 30.0 | CR123F300B | |
.52 | CR123C054A | 9.92 | CR123C104B | 39.0 | 33.0 | CR123F327B | |
.57 | CR123C060A | 11.1 | CR123C113B | 45.0 | 36.2 | CR123F357B | |
.61 | CR123C066A | 12.2 | CR123C125B |
For CR124E (Size 3) |
40.0 | CR123F395B | |
.67 | CR123C071A | 13.5 | CR123C137B | 17.2 | CR123F181B | 44.0 | CR123F430B |
.75 | CR123C078A | 14.6 | CR123C151B | 19.0 | CR123F199B | 49.6 | CR123F487B |
.84 | CR123C087A | 16.1 | CR123C163B | 21.0 | CR123F218B | 56.5 | CR123F567B |
.94 | CR123C097A | 17.9 | CR123C180B | 22.9 | CR123F233B | 64.2 | CR123F614B |
1.03 | CR123C109A | 19.3 | CR123C198B* | 24.8 | CR123F243B | 71.8 | CR123F658B |
1.14 | CR123C118A | 20.6 | CR123C214B* | 27.2 | CR123F270B | 76.4 | CR123F719B |
1.30 | CR123C131A | 22.6 | CR123C228B* | 30.0 | CR123F300B | 86.6 | CR123F772B |
1.42 | CR123C148A | 24.8 | 33.0 | CR123F327B | 94.7 | CR123F848B | |
1.61 | CR123C163A | 27.0 | 36.2 | CR123F357B | 103 | CR123F914B | |
1.72 | CR123C184A |
For CR124D (Size 2) |
40.0 | CR123F395B | 115 | CR123F104C | |
1.93 | CR123C196A | 6.63 | CR123C695A | 44.0 | CR123F430B | 130 | CR123F114C |
2.10 | CR123C220A | 7.59 | CR123C778A | 48.4 | CR123F487B | 135 | CR123F118C |
2.34 | CR123C239A | 8.39 | CR123C867A | 53.3 | CR123F567B |
For CR124G ( Size 5) ** |
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2.64 | CR123C268A | 9.20 | CR123C955A | 58.6 | CR123F614B | 89 | CR123F395B |
2.86 | CR123C301A | 9.93 | CR123C104B | 64.4 | CR123F658B | 93 | CR123F430B |
3.13 | CR123C326A | 11.2 | CR123C113B | 71.3 | CR123F719B | 100 | CR123F487B |
3.32 | CR123C356A | 12.5 | CR123C125B | 78.0 | CR123F772B | 110 | CR123F567B |
3.68 | CR123C379A | 14.1 | CR123C137B | 86.0 | CR123F848B | 120 | CR123F614B |
4.08 | CR123C419A | 15.5 | CR123C151B | 90.0 | CR123F914B | 132 | CR123F658B |
4.61 | CR123C466A | 17.4 | CR123C163B |
For CR124F ( Size 4) |
145 | CR123F719B | |
5.21 | CR123C526A | 19.8 | CR123C180B | 17.2 | CR123F181B | 160 | CR123F772B |
5.62 | CR123C592A | 21.2 | CR123C198B | 19.0 | CR123F199B | 176 | CR123F848B |
6.12 | CR123C630A | 22.7 | CR123C214B | 21.0 | CR123F218B | 191 | CR123F914B |
213 | CR123F104C | ||||||
237 | CR123F114C | ||||||
258 | CR123F118C | ||||||
270 | CR123F133C |
* For use on Size 1 only
** Two heaters required
CR123K, CR123L Panel-mounted Overload Relay Heaters
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