Siemens SENTRON - List of Abbreviations; A.1 List of Abbreviations

Selectivity for 3VA molded case circuit breakers
Configuration Manual, 08/2016, A5E03603181010-01
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List of abbreviations
A
A.1 List of abbreviations
Overview
Table A- 1 Meaning of abbreviations used in this document
A
bbreviation Meaning
AC Alternating voltage
AWG American Wire Gauge: standardized wire gauge system used in North
America
DC Direct voltage
DIN Deutsches Institut für Normierung e. V. (German Institute for Standardization)
EN European Standard
ETU Electronic Trip Unit
FTFM Fixed thermal fixed magnetic trip unit (permanently set thermal overload trip
unit, permanently set magnetic trip unit with short-circuit protection)
I Instantaneous (short-circuit protection)
IEC International Electrotechnical Commission
L Long-time delay (overload protection)
L Overload release
LI Overload protection (L) and instantaneous short-circuit protection (I)
LSI Overload protection (L), short-time delay short-circuit protection (S) and
instantaneous short-circuit protection (I)
MTU Magnetic trip unit with short-circuit protection (I)
LV Low voltage
LV-MDB Low-voltage network main distribution board
LV-SDB Low-voltage network subdistribution board
LV fuse Low-voltage fuse
S Short time delay (short-time delay short-circuit protection)
S Short-time delay over-current release
T Total selectivity up to the rated ultimate short-circuit breaking capacity of the
upstream/downstream protective device
TN [TN system] French: Terre Neutre
TMTU Thermal Magnetic Trip Unit
VDE Verein Deutscher Ingenieure (Association of German Engineers)
ZSI Zone Selective Interlocking