3WL Air Circuit Breakers
17
Siemens · 2009
3WL Air Circuit Breakers/Non-Automatic Air Circuit Breakers up to 6300 A (AC)
General data
ETU15B solid-state release
ETU25B solid-state release
Application:
Simple building and
system protection without time-se-
lective coordination up to 4000 A.
Not to be used for size III.
Features:
• Adjustable overload protection
with
I
2
t characteristic curve
with preset delay time
t
R
= 10 seconds at 6 × I
R
• Instantaneous short-circuit pro-
tection adjustable in the range
2 ... 8 ×
I
n
• Overload display
• Protection function is set by
means of the rotary coding
switch
For technical details see the table
"Functional overview of the
solid-state release system"
under "Technical specifications".
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 sys-
tem protection with time-selective
coordination for up to 6300 A
Features:
• Adjustable overload protection
with
I
2
t characteristic curve
Delay time t
R
=
10 seconds at 6 ×
I
R
• Short-time delayed short-circuit
protection adjustable in the
range 1.25 ... 12 ×
I
n
and
• Instantaneous short-circuit
protection preset
to 20 ×
I
n
, max. 50 kA
• Can be adapted at any time to
the required plant currents
through retrofittable rated cur-
rent module, thus ensuring over-
load protection in the range from
100 A to 6300 A
• Overload display
• Indicates the reason for tripping
by means of an LED
• Test facility for the release
• Protection functions are
set by means of the
rotary coding switch
For technical details see the table
"Functional overview of the
solid-state release 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
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