14
Siemens · 10/2014
General data
3WL Air Circuit Breakers
3WL air circuit breakers/non-automatic air circuit breakers up to 6300 A (AC), IEC
■
Function
ETU15B ETU25B ETU27B
Functions of the Electronic Trip Units
Basic protection functions
Overload protection L ✔ ✔ ✔
Short-time delayed short-circuit protection S -- ✔✔
Instantaneous short-circuit protection I ✔ ✔ ✔
Neutral conductor protection N -- -- ✔
Ground-fault protection G -- -- ✔
Additional functions
Neutral conductor protection (can be switched on/off) -- -- ✔
N-conductor protection adjustable -- -- --
Short-time delay short-circuit protection (can be switched on/off) -- -- --
Instantaneous short-circuit protection (can be switched on/off) -- -- --
Thermal image can be switched on/off -- -- --
Load monitoring -- -- --
Short-time delayed short-circuit protection switchable to I
2
t -- -- --
Instantaneous short-circuit protection adjustable ✔ -- --
Overload protection switchable to I
4
t -- -- --
Overload protection can be switched on/off -- -- --
Selectable parameter sets -- -- --
Parameterization and display
Parameterization through rotary coding switches (10 steps) ✔ ✔ ✔
Parameterization through communication (absolute values) -- -- --
Parameterization through user interface of ETU (absolute values) -- -- --
Parameterization of the extended protection functions -- -- --
LCD alphanumerical -- -- --
LCD graphical -- -- --
Metering function
Metering function Plus -- -- --
Communication
CubicleBUS -- -- --
Communication through PROFIBUS DP -- -- --
Communication through MODBUS -- -- --
Communication via Ethernet -- -- --
✔ Standard -- Not available ❑ Optional
Note
Detailed information about the functions of the Electronic Trip Units is given in the following.
NSE0_00880b
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