Siemens WL - Page 46

Electronic Trip Unit
WL Circuit Breaker
1/42
WL Selection and Application Guide • 2005
Application:
Cost-effective standard model for
intelligent building and all types of
industrial applications – CubicleBUS
integrated.
Features:
Same as for ETU727 plus the following:
• Adjustable long time delay
• Selectable I
2
t / I
4
t for
long time delay
• Selectable fixed time / I
2
t for short
time delay for better coordination
with downstream protection
and fuses
• Thermal memory for improved
protection of motor loads
• Selectable neutral conductor
protection using external neutral
sensor
• Modular ground fault protection,
with separately adjustable alarm
and trip function (option)
• Communication interface, for
optional metering function (PLUS),
connection of external modules as
option or retrofit
• Optional high contrast display with
viewing angle adjustment
• Setting of protective functions by
means of rotary or slide switch
For technical details, see table on
pages 1/36 and 1/37.
Application:
Cost-effective standard model for
intelligent building and all types of
industrial applications – CubicleBUS
integrated.
Features:
Same as for ETU745 without the
Instantaneous short-circuit trip
function.
For technical details, see table on
pages 1/38 and 1/39.
Electronic Trip Unit ETU748
Electronic Trip Unit ETU745
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