Siemens SENTRON 3WA1 - Page 572

List of abbreviations
3WA1 air circuit breaker
570 Equipment Manual, 02/2023, 92310000002-06
Abbreviation
Meaning
GFx
Ground fault extended
I
2
t
Current dependency of the delay time according to a formula whereby
the product of the time and the square of the current is constant
I
2
t
g
Current dependency of the delay time t
g
according to a formula whereby
the product of the time and the square of the current is constant
I
2
t
sd
Current dependency of the delay time t
sd
according to a formula
whereby the product of the time and the square of the current is
constant
I
4
t
Current dependency of the delay time according to a formula whereby
the product of the time and the value of the fourth power of the current
is constant
I tripping
Instantaneous short-circuit trip
I
avg
Instantaneous average value of the current
I
cm
Rated short-circuit making capacity
I
cs
Rated service short-circuit breaking capacity
I
cu
Rated ultimate short-circuit breaking capacity
I
cw
Rated short-time withstand current
ID
ID number
IEC
International Electrotechnical Commission
I
g
Setting for ground-fault protection
I
i
Setting for instantaneous short-circuit trip
I
IT
1-pole short-circuit test current (IT systems)
I
N
Setting for N-conductor protection
I
n
Rated current
I
n max
Maximum rated current
IOM
Input/output module
I
r
Setting for inverse-time delayed overload trip
I
sd
Setting for short-time-delayed short-circuit trip
I
THD
Setting for total harmonic distortion (THD) current
L1
Phase 1
L2
Phase 2
L3
Phase 3
L tripping
Inverse-time delayed overload trip
LED
Light emitting diode
M
Motor
MLFB
Machine-readable product designation (German acronym)
N
Neutral conductor
N 117
Australian approval mark
NC
Normally closed contact
NEMA
National Electrical Manufacturers Association
NO
Normally open contact
NIOSH
National Institute for Occupational Safety and Health
N tripping
Tripping due to overcurrent in the N-conductor
NC
NC contact
OSHA
Occupational Safety and Health Administration