Siemens SENTRON Configuration Manual page 55

Protective devices selectivity for 3va molded case circuit breakers

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the rated current of the fuse and the rated current I

and it is within this margin that selectivity is implemented.

Previous selectivity assessments indicated that an upstream molded case circuit breaker

with a rated current I

installed downstream.

Thanks to the ELISA function of the ETU340 of the 3VA2 molded case circuit breaker, for

example, total selectivity is afforded between an upstream 3VA2 molded case circuit breaker

with a rated current I

advantageous feature allows users to choose cheaper circuit breakers and configure

additional grading levels more easily in low-voltage networks.

Selectivity for 3VA molded case circuit breakers

Configuration Manual, 08/2016, A5E03603181010-01

Selectivity implemented by combinations of protective devices

of at least 250 A would be required if a 100 A LV HRC fuse were

rated

of just 160 A and a downstream 100 A LV HRC fuse. This

rated

4.4 Fuse and downstream fuse

of the molded case circuit breaker

rated

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