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WL Circuit Breaker
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WL Selection and Application Guide • 2005
Electronic Trip Unit
Electronic Trip Unit ETU755
ETU776
Rati ng Plug
TEST
QUERY
CLEAR
NSE00960
Keys for setting protective
parameters
Field addable
setting values
Indicator: Trip cause
Indicator: Trip unit error
Test socket
Mechanical trip indicator
Local mechanical RESET
or optional remote RESET
with optional reclosing lockout
Trip unit active
Query pushbutton
Test pushbutton
Rating plug
Communication active
Extended alarm function active
Indicators:
Graphical display
Ground fault trip
Indicators:
Option: Ground fault module
Space for recording
setting values
Ground fault alarm
Option: Lock prevents
unauthorized resetting
of the mechanical trip
indicator after a trip.
Overcurrent alarm
Clear trip cause indicator pushbutton
Application:
Trip unit with remote-only parameter
setting for special application
demands. CubicleBUS integrated.
Features:
Same as for ETU745 plus the
following:
• Detection of the energy flow
direction
• Two independent sets of protective
parameters, selectable via remote
control or via optional external
input module
• Overload protection that can be
switched off for use with modern
operating mechanism technology
• Adjustable short-time delay up to
4000 ms
• Neutral conductor protection
adjustable to I
N
= 2 x I
n
• Protective functions settable via
Communications (COM15/16) or
Breaker Data Adapter (BDA)
For technical details, see table on
pages 1/38 and 1/39.
Application:
Premium model with graphical display
for system analysis – CubicleBUS
integrated.
Features:
Same as for ETU755 plus the following
• Graphical display of all parameters
and event/curve characteristics
• Storage of events and causes of
release for specific error analysis
• High contrast, background-lit
graphical display with sleep mode
• Easy-to-use keypad entry of
all parameters
For technical details, see table on
pages 1/38 and 1/39.
Electronic Trip Unit ETU776
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