Siemens SENTRON 3WL10 - Page 55

Additional functions ETU320
LI
ETU350
LSI
ETU360
LSIG
ETU650
LSI
ETU660
LSIG
Rotary coding switch Display (LCD)
Display of alarms and trip log memory
in OFF status of the circuit breaker
and the ETU
With LED signal On the display (LCD)
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
● ● ● ●
(&LCD
&COM)
●
(&LCD
&COM)
Record of a measuring interval mem‐
ory and min/max registers (in ETU)
● ● ● ●
(&LCD
&COM)
●
(&LCD
&COM)
Diagnostic report ● ● ● ● ●
Enhanced settings TD410 / TD420 TD410 / TD420 or LCD
Watchdog: steady electronics or ma‐
glatch or CT failure surveillance: trip
enable
● ● ● ● ●
Overtemperature: trip enable 
●

●

●
● ●
Thermal memory disable — — — ● ●
LT protection disable — — — ●
4)
●
4)
Pre-alarm threshold PAL - function
trigger on x I
n
/I
r
— — — ● ●
Software-guided parameterization
(powercon󹪝g)
— — — ● ●
I
4
t overload characteristic &
INST = OFF setting for highly selective
applications
— — — ● ●
4)
L=OFF type of rating plug required to be able to switch o󹪜 the protection function LT
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
4
t characteristic. In this way, improved
discrimination with respect to fuses or upstream protection devices, such as medium-voltage
protection devices, can be achieved.
I
r
denotes the overcurrent setting value and t
r
the associated time delay. The time delay for
the overcurrent trip is de󹪝ned as 6 times the value of the current setting I
r
at the reference
Description
2.9Electronic trip unit ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
54 Equipment Manual, 10/2023, L1V30499596002-03