Selection Guide

32
Overload Relay Heater Tables
Class 16 Starters, Class 48 Overloads
Selection of Heater Elements for Overload Relays
Overload relays do not provide protection against short circuits. To insure proper coordination with short circuit protective devices,
select heaters from the information packaged with the control.
Selection Instructions
To select the proper heater follow the steps below:
1. Choose the proper table using the size, trip type, and number of poles
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Ambient Compensated Bimetal Heater Element Tables
Size Standard Trip (Class 20) Quick Trip (Class 10)
3rd Letter of
E Heaters Green Reset K Heaters Green Reset
Class FLA Catalog No. 2 Poles 3 Poles 2 Poles 3 Poles
16
25 - 90 A - G 295 297 395 398
120 - 150 H - I — 299 — 393
2. If you do not know the trip amps, use the motor FLA to calculate the trip amps by multiplying the FLA by a factor of 1.15
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3. Match the trip amps of your starter to the trip amps value below the starter size of the appropriate table. The choice should be as
close as possible but NOT greater than the selected trip amp value in the table to allow for proper protection.
4. Select the proper heater from the last column and order the appropriate number of heaters (single phase requires at least two,
three phase requires at least three).
Examples
Starter Size Starter Phase Trip Heater Table Motor FLA Trip Amps Heater Element
16CF15AF8 40 Single Standard 295 35 40.25 E69
16EF35AF4 60 Three Quick 398 56 64.40 K77
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5th character in the catalog number equals 1 for single phase 2 pole or 3 for three phase 3 pole.
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For 40 degrees C motors, the maximum Trip Amps are 115% of the Motor FLA or TRIP AMPS = FLA*1.15.