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NC20 - Manual - 01 - 2015
Reading variables (READ) ..........................................................................................................................................................................152
Setting modifying (SET) ............................................................................................................................................................................. 153
COMMUNICATION ......................................................................................................................................................................................154
Circuit breaker commands ........................................................................................................................................................................154
Enable / block changes via keyboard - Password .................................................................................................................................155
Mathematical formula ................................................................................................................................................................................165
Neutral unbalance current 46N - Standard inverse time curve (IEC 60255-3/BS142 type A) ........................................................166
Neutral unbalance current 46N - Very inverse time curve (IEC 60255-3/BS142 type B) ................................................................167
Neutral unbalance current 46N -Extremely inverse time curve (IEC 60255-3/BS142 type C) ....................................................... 168
Phase overcurrent 50/51 RMS - Standard inverse time curve (IEC 60255-3/BS142 type A) ......................................................... 169
Phase overcurrent 50/51 RMS - Very inverse time curve (IEC 60255-3/BS142 type B) ................................................................. 170
Phase overcurrent 50/51 RMS - Extremely inverse time curve (IEC 60255-3/BS142 type C) .........................................................171
Residual overcurrent 50N/51N - Standard inverse time curve (IEC 60255-3/BS142 type A) .........................................................172
Residual overcurrent 50N/51N - Very inverse time curve (IEC 60255-3/BS142 type B) ................................................................. 173
Residual overcurrent 50N/51N - Extremely inverse time curve (IEC 60255-3/BS142 type C) ........................................................174
Mathematical formula ................................................................................................................................................................................175
Neutral unbalance current 46N - Moderately inverse time curve (ANSI/IEEE type MI)................................................................176
Neutral unbalance current 46N - Very inverse time curve (ANSI/IEEE type VI) .............................................................................177
Neutral unbalance current 46N - Extremely inverse time curve (ANSI/IEEE type EI) ................................................................... 178
Phase overcurrent 50/51 RMS - Moderately inverse time curve (ANSI/IEEE type MI) ................................................................. 179
Phase overcurrent 50/51 RMS - Very inverse time curve (ANSI/IEEE type VI) ............................................................................... 180
Phase overcurrent 50/51 RMS - Extremely inverse time curve (ANSI/IEEE type EI) ......................................................................181
Residual overcurrent 50N/51N - Moderately inverse time curve (ANSI/IEEE type MI) .................................................................182
Residual overcurrent 50N/51N - Very inverse time curve (ANSI/IEEE type VI) .............................................................................. 183
Residual overcurrent 50N/51N - Extremely inverse time curve (ANSI/IEEE type EI) ......................................................................184
8.4 APPENDIX B1 - I/O Diagram .........................................................................................................................................................................185
8.5 APPENDIX B2 - Interfaces ............................................................................................................................................................................186
8.6 APPENDIX B3- Connection diagrams .........................................................................................................................................................187
8.7 APPENDIX C - Dimensions ........................................................................................................................................................................... 189
8.8 APPENDIX D - Setting table ......................................................................................................................................................................... 190
8.8 APPENDIX E - Revisions history ...................................................................................................................................................................226
8.9 APPENDIX F - EC Declaration of conformity ..............................................................................................................................................227