Thytronic NC20 User Manual

179
NC2 0 - Manual - 01 - 2015
APPENDIX
Phase overcurrent 50/51 RMS - Moderately inverse time curve (ANSI/IEEE type MI)
F_51-ANSIMI-Char.ai
1.1
2 3 4 5 6 7 8 9 10 20
I
RMS
/I>
inv
0.01
0.1
1
10
100
1000
10000
t [s]
t>
inv
= 10 s
t>
inv
= 60 s
t>
inv
= 5 s
t>
inv
= 1 s
t>
inv
= 0.02 s
t>
inv
= 0.2 s
t>
inv
= 0.1 s
t>
inv
= 0.5 s
t =
t>
inv
·
[(I
RMS
/I>
inv
)
0.02
-1]
0.01
+ 0.023
Note: match of operating and setting time takes place when I
RMS
/I>
inv
= 1.664

Thytronic NC20 Specifications

General

Brand	Thytronic
Model	NC20
Category	Power distribution unit
Language	English