9 – 1
9 Electronic components
9.1 Trip units
9.1.1 Overview of function
q standard
ooptional
- not available
1
fixed
Trip Units
Functions ETU745
(9-2)
ETU776
(9-7)
Basic protective functions (page 9-11)
Overload protection (L-tripping) qq
Short-time-delayed short-circuit protection (S-tripping) qq
Instantaneous short-circuit protection (I-tripping) q q
Neutral conductor protection (N-tripping) q q
ground-fault tripping o o
Additional functions (page 9-13)
Load monitoring q q
Pre-trip signal for long-time trip q q
Thermal memory can be switched on/off q q
Zone selective interlocking o o
Neutral conductor protection can be switched on/off q q
Short-time delayed short-circuit protection can be switched on/off 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
Overload protection switchable to I
4
t q q
Changeable parameter sets - q
Ground-fault protection to I
2
t o o
Ground-fault alarm o o
Display (page 9-17)
Alphanumeric display o -
Graphical display (fixed-mounted) - q
Communication
Communication via c q q
Communication via PROFIBUS DP o o
Communication via Modbus RTU o o
Communication via Modbus TCP o o
Communication via PROFINET IO o o
Metering function (page 9-77)
Metering function PLUS o o
Parameterization
Parameterization via rotary coding switches 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
Other
Option for connecting to an external 24 V DC power supply q q
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