List of abbreviations
C.1 Table of abbreviations
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
471
Abbreviation
Meaning
RCR
Residual Current Release
REC
Reclose (automatic reset)
RJ [connector]
Registered Jack
RMS
Root Mean Square
RS [interface]
Formerly: Radio Selector; now usually: Recommended Standard
RTU
[Modbus interface]
Remote Terminal Unit
SAS
Short circuit alarm switch
PLC
Programmable logic controller
ST
Shunt trip
STF
Shunt trip flexible
STL
Shunt trip left
SWD
Switching duty
T
Test
T [IT systems]
French: Terre (ground)
TC
Test device for molded case circuit breaker or MRCD, suitable for systems
with grounded phase
TCP
Transmission Control Protocol
TD
Test Device
TM
Thermal Magnetic
TMTU
Thermal Magnetic Trip Unit
TRIP-IND
TRIP INDICATOR (trip alarm switch)
TRUE RMS
TRUE root-mean-square
TU
Trip Unit
UAR
Universal release
UL
Underwriters Laboratories Inc.
UR
Undervoltage release
USB
Universal Serial Bus
UPS
Uninterruptible power supply
UVR
Undervoltage release
VDE
Verein Deutscher Ingenieure (Association of German Electrical Engineers)
VDI
Verein Deutscher Ingenieure (Association of German Engineers)
ZSI
Zone Selective Interlocking
ZSS
Zone Selective Interlocking
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