Heater Selection Information

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.

How to Select Heaters

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.

Series Description Heater Table Column
CR306 3 phase, 3 pole, 3 leg protection standard C
ambient compensated (except size 3 & 4) D
ambient compensated size 3 D
ambient compensated size 4 E

Table for CR110H & CR110Y Manual Starters … click here

General Electric
NEMA SIZES 00, 0 and 1 NEMA SIZE 2 NEMA SIZE 3
Catalog
Number
Maximum Motor – Full Load Amps Catalog
Number
Maximum Motor – Full Load Amps Catalog
Number
Maximum Motor – Full Load Amps
A B C D A B C D C D
CR123C118A 1.12 1.09 1.04 1.02 CR123C592A 5.92 5.79 CR123F357B 31.8 31.3
CR123C131A 1.26 1.22 1.15 1.10 CR123C630A 6.23 6.12 5.85 5.72 CR123F430B 37.6 34.3
CR123C695A 6.63 6.49 6.47 6.30 CR123F487B 41.9 40.9
CR123C148A 1.40 1.31 1.27 1.23 CR123C778A 7.72 7.59 7.35 7.04
CR123C163A 1.46 1.46 1.39 1.38 CR123C867A 8.96 8.71 8.06 7.91 CR123F614B 52.1 51.1
CR123C184A 1.63 1.59 1.55 1.49 CR123F772B 68.1 63.3
CR123C196A 1.79 1.74 1.73 1.67 CR123C104B 10.4 10.1 9.61 9.27
CR123C220A 1.97 1.93 1.89 1.79 CR123C113B 11.7 11.2 10.5 9.99 CR123F848B 71.5 66.1
CR123C125B 12.1 11.9 11.6 11.1 CR123F114C 90.0 90.0
CR123C239A 2.25 2.13 2.05 1.98 CR123C137B 13.5 12.6 12.5 12.1
CR123C268A 2.43 2.37 2.28 2.24 CR123C151B 14.7 14.5 13.6 13.1
CR123C301A 2.60 2.52 2.47 2.43
CR123C326A 2.96 2.87 2.79 2.75 CR123C163B 18.3 17.7 16.7 15.5
CR123C356A 3.57 3.39 3.31 3.25 CR123C180B 20.1 19.1 17.9 16.8
CR123C198B 22.3 21.4 18.7 18.0
CR123C379A 3.86 3.59 3.70 3.43 CR123C214B 25.0 22.9 20.4 19.7
CR123C419A 4.43 4.31 4.06 4.03 CR123C228B 27.7 24.7 22.7 21.6
CR123C466A 4.87 4.57 4.47 4.43
CR123C526A 5.37 5.31 4.95 4.94 CR123C250B 29.3 25.9 24.7 23.9
CR123C592A 5.99 5.86 5.49 5.36 CR123C237B 30.7 27.1 26.3 25.5
CR123C303B 32.7 30.2 29.5 28.2
CR123C630A 6.39 6.19 5.91 5.77 CR123C330B 35.6 34.8 32.5 31.6
CR123C695A 6.87 6.61 6.47 6.35
CR123C778A 7.71 7.61 7.20 6.92 CR123C400B 45.0 45.0 41.9 37.8
CR123C867A 8.72 8.46 8.22 7.99 CR123C440B 43.2 40.6
CR123C104B 10.5 10.4 9.67 9.19
CR123C113B 11.7 11.3 10.4 10.0
CR123C125B 12.2 11.9 11.0 10.7
CR123C137B 13.5 13.0 12.4 12.0
CR123C151B 15.1 14.5 13.2 12.9
CR123C163B 17.5 17.4 15.4 15.1
CR123C180B 18.9 18.6 17.1 16.3
CR123C198B 20.8 20.5 18.1 17.9
CR123C214B 22.4 22.3 20.0 19.7
CR123C228B 25.5 25.7 22.5 21.2
CR123C250B 26.2 25.7 22.5 22.3
CR123C273B 27.0 27.0 23.9 22.3
CR123C303B 26.3 25.5
CR123C330B 27.0 27.0

The table below gives a proper size heater to trip the switch
at approximately 125 per cent of motor current.
Listed values are for motors with 1.15/1.25 service factor.
For continuous rated motors with a service factor of 1.0,
multiply full-load current of motor by 0.9 and use this value
to select heater. If motor full-load amperes falls between
two ratings, select heater for the higher rating.
For 1.35 service factor motors, multiply full-load current of
motor by 1.15 and use this value to select heater(s).

Max Full-load amps Heater Catalog Number
3.88 CR123H446A
4.60 CR123H529A
5.00 CR123H575A
5.43 CR123H625A
6.41 CR123H739A
6.98 CR123H802A
8.25 CR123H950A
10.6 CR123H122A
13.6 CR123H157A
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