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Thermal Overload Table:
I / In TIME I / In TIME I / In TIME I / In TIME I / In TIME
I / In
1.01 26122
1.05 5122
1.10 2500 3.60 43.9 6.10 14.5 8.60 7.2 11.10 4.3
1.20 1193 3.70 41.3 6.20 14.0 8.70 7.0 11.20 4.2
1.30 760.8 3.80 39.0 6.30 13.6 8.80 6.9 11.30 4.1
1.40 546.8 3.90 36.9 6.40 13.1 8.90 6.7 11.40 4.1
1.50 419.9 4.00 35.0 6.50 12.7 9.00 6.6 11.50 4.0
1.60 336.5 4.10 33.2 6.60 12.3 9.10 6.4 11.60 3.9
1.70 277.7 4.20 31.5 6.70 12.0 9.20 6.3 11.70 3.9
1.80 234.3 4.30 30.0 6.80 11.6 9.30 6.1 11.80 3.8
1.90 201.1 4.40 28.6 6.90 11.3 9.40 6.0 11.90 3.7
2.00 174.9 4.50 27.3 7.00 10.9 9.50 5.9 12.00 3.7
2.10 153.9 4.60 26.0 7.10 10.6 9.60 5.8
2.20 136.7 4.70 24.9 7.20 10.3 9.70 5.6
2.30 122.3 4.80 23.8 7.30 10.0 9.80 5.5
2.40 110.3 4.90 22.8 7.40 9.8 9.90 5.4
2.50 100.0 5.00 21.9 7.50 9.5 10.00 5.3
2.60 91.1 5.10 21.0 7.60 9.2 10.10 5.2
2.70 83.4 5.20 20.1 7.70 9.0 10.20 5.1
2.80 76.7 5.30 19.4 7.80 8.8 10.30 5.0
2.90 70.8 5.40 18.6 7.90 8.5 10.40 4.9
3.00 65.6 5.50 17.9 8.00 8.3 10.50 4.8
3.10 60.9 5.60 17.3 8.10 8.1 10.60 4.7
3.20 56.8 5.70 16.7 8.20 7.9 10.70 4.6
3.30 53.1 5.80 16.1 8.30 7.7 10.80 4.5
3.40 49.7 5.90 15.5 8.40 7.5 10.90 4.5
3.50 46.6 6.00 15.0 8.50 7.4 11.00 4.4
Table values are for Curve Multiplier = 6. For other value of Curve Multiplier divide table values by 6 and
multiply by the required Curve Multiplier:
TIME = Time from table * Curve Multiplier / 6.
Example 1: Find time to trip of a cold motor at 5In with CM = 8
From the above table, time to trip at 5In, with CM = 6 is 21.9 Sec.
With CM = 8, time to trip is 8 / 6 * 21.9 = 29.2 Sec.
To find the time for a hot motor find first the time as explained above, then multiply by the Hot/Cold ratio.
Example 2: Find time to trip of a hot motor for the above example while Hot/Cold ratio is set to 60%.
Solution:
Multiply the result of Example 1 by 0.6 (60%). 29.2 * 0.6 = 15.5 Sec.
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