Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
123
Electronic trip unit ETU340 ELISA LI
The 3VA2 molded case circuit breaker with the ETU340 ELISA electronic trip unit has been
specially developed for implementing selectivity with fuses in operational class gG. The
tripping characteristic of the ETU340 ELISA of the 3VA2 molded case circuit breaker exhibits
a similar characteristic to fuses of operational class gG, e.g. LV HRC fuses, across the entire
overcurrent range.
From the selectivity perspective, this ETU340 ELISA is therefore especially suitable for
combination with upstream and downstream fuses.
Thanks to the ELISA function of the ETU340, for example, total selectivity is afforded
between an upstream 3VA2 molded case circuit breaker with a rated current I
n
of just 160 A
and a downstream 100 A LV HRC fuse. This advantageous feature allows users to choose
cheaper circuit breakers and configure additional grading levels more easily in low-voltage
networks.
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