Siemens 3wl - Page 19

17
Siemens · 10/2014
3WL Air Circuit Breakers
3WL air circuit breakers/non-automatic air circuit breakers up to 6300 A (AC), IEC
General data
ETU15B Electronic Trip Unit
ETU25B Electronic Trip Unit
Application:
Simple building and system protection without
time-selective coordination up to 4000 A.
Not to be used for size III.
Properties:
• Adjustable overload protection with I
2
t characteristic
with non-adjustable delay time t
R
= 10 seconds
at 6 ×
I
R
• Instantaneous short-circuit protection adjustable in
the range 2 ... 8 ×
I
n
• Overload display
• Protection function is set by means of the rotary coding
switch
Technical details, see the table "Functional overview of
the electronic trip system" under "Technical specifica-
tions"
NSE0_00954b
Option: safety lock
prevents pressing of
reset button after
overcurrent release
Indicator: fault in
overcurrent release
Sealing ring
Test socket
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: overload alarm
Indicator: overcurrent
release activated
Application:
Classical building, motor and system protection with
time-selective coordination for up to 6300 A
Properties:
• Adjustable overload protection with I
2
t characteristic
Delay time
t
R
= 10 seconds at 6 × I
R
• Short-time delayable short-circuit protection adjustable
in the range 1.25 ... 12 ×
I
n
and
• Instantaneous short-circuit protection non-adjustable
to 20 ×
I
n
, max. 50 kA
• Can be adapted at any time to the required plant
currents through exchangable rated current module,
thus ensuring overload protection in the range from
100 A to 6300 A
• Overload display
• Indicates the cause of tripping by means of an LED
• Test facility for the trip unit
• Protection function is set by means of the rotary coding
switch
Technical details, see the table "Functional overview of
the electronic trip system" under "Technical
specifications"
NSE0_00955b
Rating Plug
ETU25B
Option: safety lock
prevents pressing of
reset button after
overcurrent release
Indicator: fault in
overcurrent release
Sealing ring
Test socket
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
Clear pushbutton
Indicator: cause of release
Rotary switch for delay,
short-circuit release
Rated current module
Short-circuit protection
fixed setting
© Siemens AG 2015