Accessories
4.9 EFB300 external function box
3VA molded case circuit breakers with UL and IEC certification
338 Manual, 01/2019, L1V30435333-01
EFB300 external function box
4.9.1
The 3VA UL molded case circuit breakers with the electronic trip systems ETUs 3-series,
5-series and 8-series can be functionally expanded with the EFB300 external function box.
The EFB300 external function box receives information from the ETU via a cable connection.
This information (warnings, reason for last trip, energy meter) can be output via the four
digital outputs.
Zone selective interlocking functionality (ZSI, see chapter Zone Selective Interlocking
(Page 76)) can also be implemented via the EFB300. The EFB300 also supplies the ETU
with power which means that the ETU can be parameterized via the display even when a
3VA UL molded case circuit breaker is in the de-energized state.
LED display
<SET> button
ZSI Zone Selective Interlocking
DI Digital input
DO 0 … 3 Digital output
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