9 – 1
9 Electronic components
9.1 Trip units
9.1.1 Overview of function
qstandard
ooptional
-not available
1
fixed
Trip Units
Functions ETU745
(9-2)
ETU748
(9-6)
ETU776
(9-8)
Basic protective functions (page 9-12)
Overload protection (L-tripping) qqq
Short-time-delayed short-circuit protection (S-tripping) qqq
Instantaneous short-circuit protection (I-tripping) q q
1)
q
Neutral conductor protection (N-tripping) q q q
ground-fault tripping o o o
Additional functions (page 9-14)
Load monitoring q q q
Leading signal for "L-tripping" q q q
Thermal memory can be switched on/off q q q
Zone selective interlocking o o o
Neutral conductor protection can be switched on/off q q q
Short-time delayed short-circuit protection can be switched on/off q q q
Instantaneous short-circuit protection can be switched on/off q - q
Short-time delayed short-circuit protection switchable to I
2
t q q q
Overload protection switchable to I
4
t q q q
Changeable parameter sets - - q
Ground-fault protection to I
2
t o o o
Ground-fault alarm o o o
Display (page 9-18)
Alphanumeric display o o -
Graphical display (fixed-mounted) - - q
Communication
Communication via c q q q
Communication via PROFIBUS-DP o o o
Communication via MODBUS o o o
Communication via Ethernet o o o
Metering function (page 9-72)
Metering function PLUS o o o
Parameterization
Parameterization via rotary coding switches q q -
Parameterization via communication (absolute values) - - q
Parameterization via menu (absolute values) - - q
Remote parameterization of basic protective functions - - q
Remote parameterization of additional functions q q q
Other
Option for connecting to an external 24 V DC power supply q q q
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