List of abbreviations
C.1 List of abbreviations
3VA molded case circuit breakers with IEC certificate
652 Manual, 03/2019, A5E03603177010-03
I Instantaneous (short-circuit protection)
I Isolated
I / O Input / Output
IEC International Electrotechnical Commission
INST [tripping
characteristic]
INST [tripping characteristic]
INSTA Final distribution area
IP International Protection
IT Injection Tester
IT Isolated ground, French: "Isolé Terre"
L Long-time delay (overload protection)
L Overload release
LBS Load Break Switch (switch disconnector)
LCS Leading changeover switch
LI Overload protection (L) and instantaneous short-circuit protection (I)
LIG Overload protection (L), instantaneous short-circuit protection (I) and ground-
fault protection (G)
LIN Overload protection (L), instantaneous short-circuit protection (I) and neutral-
conductor protection (N)
LSI Overload protection (L), short-time delayed short-circuit protection (S) and
instantaneous short-circuit protection (I)
LSIN Overload protection (L), short-time delayed short-circuit protection (S), instan-
taneous short-circuit protection (I) and neutral-conductor protection (N)
LSING Overload protection (L), short-time delayed short-circuit protection (S), instan-
taneous short-circuit protection (I) and ground-fault protection (N)
LT [tripping
characteristic]
Partial overload range of the characteristic curve of a switching device
MCCB Molded case circuit breaker
MO Motor operator
MRCD Modular residual current device [without integrated trip device]
N Neutral conductor
NC Normally closed contact
NEMA National Electrical Manufacturers Association
NFPA National Fire Protection Association
NO Normally open contact
LV Low voltage
LV fuse Low-voltage fuse
PAC Power Analysis & Control
PI Plug-in (unit)
RCD Residual Current Device
R RESET
RCR Residual Current Release
REC Reclose (automatic reset)
RJ [connector] Registered Jack
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