3WL air circuit breakers
3.1 Introduction and overview
3WL/3VL circuit breakers with communication capability - PROFIBUS
28 System Manual, 03/2011, A5E01051353-02
Versions
The communication-capable trip units differ in their design:
● The ETU45B has a rotary coding switch on the front for setting the protection parameters.
These can only be read via the communication system.
● Optionally, the ETU45B can be equipped with a four-line display for showing the
measured values. The protection parameters can only be modified via PROFIBUS DP.
● The ETU76B offers a pixel-graphics display with a clear, key-operated menu. This display
can be used not only to show measured values, status information and maintenance
information, but also to read all available parameters and modify them with password
protection.
Tripping system
The table below provides an overview of the functions and options of the tripping system of
the trip units ETU15B, ETU25B and ETU27B without communications capability, and of the
communication-capable trip units ETU45B and ETU76B.
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