ISA T1000 PLUS User Manual page 142

DOC. MIE91093
With US standards, the different curves correspond to the
following formula.

t ( s )
Constants of the formula change according to the type of
curve; they are summarised in the following table.
US
US Moderately Inverse
US Inverse
US Very Inverse
US Extremely Inverse
Rev. 1.34





K * a
T



0.0226
0.0963
0.0352
b
c
 
I
   
 
I
R
a c
0.0104
0.18 5.95
3.88
5.67
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






1

b
0.02
2
2
2