Thytronic NC20 User Manual

170
170
NC2 0 - Manual - 01 - 2015
APPENDIX
Phase overcurrent 50/51 RMS - Very inverse time curve (IEC 60255-3/BS142 type B)
F_51-IECB-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
= 0.5 s
t>
inv
= 0.2 s
t>
inv
= 0.02 s
t>
inv
= 0.1 s
13.5
Note: match of operating and setting time takes place when I
RMS
/I>
inv
= 14.5
t =
t>
inv
·
[(I
RMS
/I>
inv
) -1]

Thytronic NC20 Specifications

General

Brand	Thytronic
Model	NC20
Category	Power distribution unit
Language	English