3WL Air Circuit Breakers
3WL Air Circuit Breakers/Non-Automatic Air Circuit Breakers up to 6300 A (AC)
General data
18
Siemens · 2009
ETU27B solid-state release
ETU45B solid-state release
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".
NSE0_00956c
Rating Plug
N
OFF
OFF ON
ETU27B
Rotary switch for delay,
earth-fault protection
N-conductor protection
on/off
value, earth-fault protection
Rotary switch for setting
Rated current module
Option: safety lock
prevents pressing of
reset button after
overcurrent release
Indicator: fault in
overcurrent release
Sealing ring
Test socket
Clear pushbutton
Indicator: cause of release
Rotary switch for delay,
short-circuit release
Mechanical RESET
for reclosing lockout
and mechanical
tripped indicator
Rotary switch for setting
value, overload release
Rotary switch for setting
value, instantaneous
short-circuit release
Indicator: overcurrent
release activated
Indicator: overload alarm
Query pushbutton
Test pushbutton
Short-circuit protection
fixed setting
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".
=
12
g
NSE0_00957b
Rating Plug
OFF ON
1
1
1
1
1
S
I
ETU45B
t
/
t
42
t
/
t
2
gg
Option: safety lock
prevents pressing of
reset button after
overcurrent release
Mechanical RESET
for reclosing lockout
and mechanical
tripped indicator
Indicator: fault in
overcurrent release
Sealing ring
Test socket
Rotary switch for setting
value, overload release
Rotary switch for setting
value, instantaneous
short-circuit release
Overload alarm
Overcurrent release
activated
Clear pushbutton
Indicator: cause of release
Rotary switch for delay,
short-circuit release
Rated current module
Selector for
earth-fault protection
Rotary switch for delay,
earth-fault protection
N-conductor protection on/off
Scroll up
COMMUNICATION
EXPANDED
Indicators:
Rotary switch for setting
value, short-circuit
protection
Rotary switch for setting
value, earth-fault
protection
Rotary switch for setting
value, earth-fault alarm
Test pushbutton
Query pushbutton
Option: alphanumeric display
Scroll down
Thermal memory on/off
Setting value
N-conductor overload
Indicator: earth-fault tripped
Indicator: earth-fault alarm
Option: earth-fault module
Rotary switch for delay,
overload release
Transfer of overload
characteristic
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