Siemens SENTRON 3VL - Application planning; 6.1 Use with frequency converters

3VL molded-case circuit breakers
System Manual, 03/2009, 110 0110 - 02 DS 01
65
Application planning
6
6.1 Use with frequency converters
Frequency converter and SENTRON VL circuit breaker combination
SENTRON VL circuit breakers can be used as primary connection protection devices in
systems in which frequency converters, variable-speed drives, and electronic motor control
devices are used. The thermomagnetic and electronic trip units of the SENTRON VL circuit
breakers can be used in these applications. The SENTRON VL trip units are not influenced
by harmonic effects due to the r.m.s. measurement.
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Figure 6-1 Frequency converters
Table 6- 1 Circuit breaker ↔ converter
Upstream: Circuit breaker Downstream: Converter
Application Trip unit
Motor Protection Electronic Yes
Electronic Yes System protection
Thermo-
magnetic
Yes
Note
Alternative circuit breakers
SIRIUS 3RV circuit breakers can be used as an alternative for applications up to
approximately 45 kW .