Siemens 3wl - Page 20

18
Siemens · 10/2014
General data
3WL Air Circuit Breakers
3WL air circuit breakers/non-automatic air circuit breakers up to 6300 A (AC), IEC
ETU27B Electronic Trip Unit
ETU45B Electronic Trip Unit
Application:
Classical building, motor and system protection with
time-selective coordination for up to 6300 A.
Properties:
The same as ETU25B but also
• Connectable neutral conductor protection
• Permanently integrated ground-fault protection. Calculation
of the ground-fault current through vectorial summation
current formation
Technical details, see the table "Functional overview of the
electronic trip system" under "Technical specifications"
NSE0_00956c
Rating Plug
N
OFF
OFF ON
ETU27B
Rotary switch for delay,
ground-fault protection
N-conductor protection
on/off
value, ground-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 buildings and all
types of industrial applications – "CubicleBUS integrated"
Properties:
The same as ETU25B but also
• Adjustable time-lag class for overload protection
• Selectable characteristic for overload and short-time
delayed short-circuit range (current discrimination) for
more accurate discrimination adaptation to upstream
fuses and protective devices
• Thermal image as restart protection for tripped motor
outgoing units
• Connectable and adjustable neutral conductor protection
• Modular ground-fault protection module with alarm and
tripping functions which can be adjusted separately
• Communication interface, metering function Plus, optional
connection of external modules or for retrofitting
• Storage of events and causes of tripping for specific fault
analysis
• Extended protection functions possible with metering
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
Technical details, see the table "Functional overview of the
electronic trip system" under "Technical specifications"
=
12
g
NSE0_00957c
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
ground-fault protection
Rotary switch for delay,
ground-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, ground-fault
protection
Rotary switch for setting
value, ground-fault alarm
Test pushbutton
Query pushbutton
Option: alphanumeric display
Scroll down
Thermal memory on/off
Setting value
N-conductor overload
Indicator: ground-fault tripped
Indicator: ground-fault alarm
Option: ground-fault module
Rotary switch for delay,
overload release
Transfer of overload
characteristic
© Siemens AG 2015