Siemens Sentron 3VA - Conversion tables

List of abbreviations
C.1 Table of abbreviations
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
473
Symbol/
abbreviation
Meaning
t
i
"Virtual" trip time of I protection; highest trip time associated with rated tripping
current of instantaneous trip
t
ld
Trip time associated with current setting value of adjustable overload release
T
p
Trip time; delay time; time-lag class
t
sd
Trip time associated with short-time delayed tripping current; delay time of S pro-
tection
t
S
Fuse operating time
t
ZSI
Delay time of all molded case circuit breakers which detect the short circuit but do
not receive a blocking signal when ZSI is activated.
U Voltage across main contacts of the molded case circuit breaker
U
e
Maximum voltage; rated operating voltage
U
Nn
System rated voltage