Siemens SENTRON 3WL Reference Manual page 18

3WL Air Circuit Breakers
3WL Air Circuit Breakers/Non-Automatic Air Circuit Breakers up to 6300 A (AC)
General data
ETU27B solid-state release
Mechanical RESET
for reclosing lockout
and mechanical
tripped indicator
Indicator: overcurrent
release activated
Indicator: overload alarm
Rating Plug
Rated current module
Rotary switch for setting
value, overload release
Rotary switch for setting
value, instantaneous
short-circuit release
Short-circuit protection
fixed setting
OFF
Rotary switch for setting
value, earth-fault protection
Query pushbutton
Test pushbutton
ETU45B solid-state release
Mechanical RESET
for reclosing lockout
and mechanical
tripped indicator
Scroll up
Indicators:
Overcurrent release
activated
Overload alarm
COMMUNICATION
EXPANDED
Rated current module
Rating Plug
Rotary switch for setting
value, overload release
Rotary switch for setting
value, instantaneous
short-circuit release
Rotary switch for setting
value, short-circuit
protection
Selector for
earth-fault protection
S
I
Rotary switch for setting
g
value, earth-fault
protection
Rotary switch for setting
value, earth-fault alarm
Test pushbutton
Query pushbutton
NSE0_00957b
18 Siemens · 2009
Option: safety lock
prevents pressing of
reset button after
overcurrent release
N-conductor protection
ETU27B
on/off
OFF ON
Indicator: fault in
overcurrent release
N
Indicator: cause of release
Rotary switch for delay,
short-circuit release
Sealing ring
Rotary switch for delay,
earth-fault protection
Clear pushbutton
Test socket
Option: safety lock
prevents pressing of
reset button after
overcurrent release
Option: alphanumeric display
Scroll down
Indicator: fault in
overcurrent release
Thermal memory on/off
ETU45B
N-conductor protection on/off
Setting value
OFF ON
N-conductor overload
= Transfer of overload
2 4
characteristic t / t
1
1
Rotary switch for delay,
1
1
overload release
1
Rotary switch for delay,
short-circuit release
Indicator: cause of release
Sealing ring
Option: earth-fault module
Indicator: earth-fault alarm
Indicator: earth-fault tripped
Rotary switch for delay,
2
t / t
earth-fault protection
g g
Clear pushbutton
Test socket
Application:
Classical building, motor and sys-
tem protection with time-selective
coordination for up to 6300 A
Features:
The same as ETU25B but also
• Reversible neutral conductor
protection
• Permanently integrated ground-
fault protection. Calculation of
the ground-fault current through
vectorial summation current
formation
For technical details see the table
"Functional overview of the
solid-state release system"
under "Technical specifications".
Application:
Low-cost all-round system for intelligent buil-
dings and all types of industrial applications –
"CubicleBUS integrated"
Features:
The same as ETU25B but also
• Adjustable time-lag class
for overload protection
• Selectable characteristic for overload and
short-delayed short-circuit range (current
discrimination) for more accurate discrimi-
nation adaptation to upstream fuses and
protective devices
• Thermal image as restart protection for trip-
ped motor outgoing feeders
• Reversible and adjustable neutral conduc-
tor protection
• Modular ground-fault protection module
with alarm and tripping functions which can
be adjusted separately
• Communication interface,
measurement function Plus, optional con-
nection of external modules or for
retrofitting
• Storage of events and causes for tripping
for detailed fault analysis
• Extended protection function possible with
measurement function
• Optional high-contrast display with viewing
angle adjustment option
• The protection functions can be set by
means of a rotary coding switch or slide
switch
For technical details see the table
"Functional overview of the
solid-state release system"
"Technical specifications".