Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
145
3VA molded case circuit breakers for starter protection
When the 3VA molded case circuit breaker is used as a starter protection circuit breaker, the
3VA only takes on the short-circuit protection function of the motor feeder. The overload
protection of the motor feeder is provided by an overload relay, such as 3RB, or by a motor
management device, such as SIMOCODE.
Functional switching is performed by the contactor.
Two different device ranges are available for starter protection applications:
● 3VA1 starter protection circuit breaker with a magnetic trip unit for standard motor feeders
with a rated conditional short-circuit current I
q
up to 100 kA
● 3VA2 starter protection circuit breaker with electronic trip unit for high-end motor feeders
with a rated conditional short-circuit current I
q
up to 150 kA
You will find the tested device combinations in the Siemens Industry Online Support
(https://support.industry.siemens.com/cs/ww/en/view/109483387
).
The short-circuit release of the TM110M magnetic trip unit is not adjustable. In this case the
short-circuit release is permanently set to 16 times the rated current I
n
.
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