Siemens SENTRON 3WL10 Equipment Manual page 55

Description
2.9 Electronic trip unit ETU
Additional functions
Display of alarms and trip log memory
in OFF status of the circuit breaker
and the ETU
With test device TD420 on ETU front interface
Data log with internal high resolution
memory
Enhanced testing and
analysis of protection functions
With gateway device TD410/TD420 on ETU front interface
Read/write maintenance info, contact
wear, history, time
Record of a measuring interval mem‐
ory and min/max registers (in ETU)
Diagnostic report
Enhanced settings
Watchdog: steady electronics or ma‐
glatch or CT failure surveillance: trip
enable
Overtemperature: trip enable
Thermal memory disable
LT protection disable
Pre-alarm threshold PAL - function
trigger on x I
n
Software-guided parameterization
(powerconfig)
I t overload characteristic &
4
INST = OFF setting for highly selective
applications
L = OFF type of rating plug required to be able to switch off the protection function LT
4)
Description of the protection functions
Overload protection (LT)
The overload protection of the ETUs of the 3 and 6‑series is inverse-time long-time-delayed
and has an I²t characteristic by default. On electronic trip units of the 6-series, the
characteristics can be adapted to characteristics acc. to IEC 60255 to meet increased or
special requirements, for example, to produce a I
discrimination with respect to fuses or upstream protection devices, such as medium-voltage
protection devices, can be achieved.
I denotes the overcurrent setting value and t
r
the overcurrent trip is defined as 6 times the value of the current setting I
54
/I
r
ETU320 ETU350
LI LSI
Rotary coding switch
With LED signal
— —
● ●
● ●
● ●
● ●
TD410 / TD420
● ●
● ●
— —
— —
— —
— —
— —
t characteristic. In this way, improved
4
the associated time delay. The time delay for
r
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
ETU360 ETU650
LSIG LSI
Display (LCD)
On the display (LCD)
— ●
● ●
● ●
(&LCD
&COM)
● ●
(&LCD
&COM)
● ●
TD410 / TD420 or LCD
● ●
●
●
— ●
— ●
4)
— ●
— ●
— ●
at the reference
r
Equipment Manual, 10/2023, L1V30499596002-03
ETU660
LSIG
●
●
●
(&LCD
&COM)
●
(&LCD
&COM)
●
●
●
●
●
4)
●
●
●