Eaton Digitrip 3000 series - APPENDIX A; A1.0 INTRODUCTION

Instruction Leaflet DT3000
Page 58 Effective: Date 07/02 I.B. 17555D
For more information visit: www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
Figure 7-17 IEC-B Very Inverse Curves (SC-6689-96)
0.01
0.10
1.00
10.00
100.00
1000.00
1 10 100
Multiple of Pickup Current (I/I
pu
)
Trip Time (seconds)
0.7
0.05
0.15
1
0.5
0.3
0.2
0.1
Adjustable Time Multiplier (0.05………1.00)
Tolerance: Time Multiplier Tolerance is ± 10% or ± 0.09 s,
whichever is larger (>1.5 x I
pu
)
For Ground Pickup <0.2
pu
: trip time tolerance is ±15%
Minimum Trip Time is 2 power line cycles
Time
Multiplier