3VL molded-case circuit breaker
4.1 Brief description
3WL/3VL circuit breakers with communication capability - PROFIBUS
90
System Manual, 03/2011, A5E01051353-02
4.1.3
Properties of the trip units
Every trip unit of the SENTRON VL can in principle be enabled for communication with the
appropriate accessories. However, they vary in their equipment (such as the display) and in
the available options for setting the protection parameters (rotary coding switch, keyboard,
software).
The thermal-magnetic overcurrent trip units can be used for rated currents in the range from
16 A to 630 A. Communication via PROFIBUS DP with a SENTRON VL with thermal-
magnetic trip unit is only possible via SIMOCODE-DP.
4.1.4
Electronic overcurrent tripping systems
The electronic overcurrent tripping systems ETU and LCD ETU are suitable for rated
currents in the range from 63 A to 1600 A.
The difference between the two ETUs is that on the ETU without LCD, the settings for
tripping current, delay time, etc. must be made using the rotary coding switch.
By contrast, on the SENTRON VL with LCD ETU, the settings can be made conveniently
using a menu-prompted display that also shows current values during operation such as
those for the current of individual phases.
ETU
On the electronic trip units with rotary coding switch (ETU), COM20 is required for
connecting to PROFIBUS DP.
LCD ETU
On the electronic trip units with display (LCD ETU, Order No. 3VLx7xx-xU), connection to
PROFIBUS DP is possible with the help of the PROFIBUS DP module COM20, Release 2.
4.1.5
Protection functions
The table below shows the protection functions of the different trip units and their setting
ranges.