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Siemens 3AK Operating Instructions Manual Page 23

Vacuum circuit-breaker module.
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Fig. 21
2nd shunt release (54.2)
Fig. 22
Transformer-operated releases (54.3)
9229 9923 176 0B
A further shunt release, transformer-operated release, undervoltage release or
instantaneous release can be installed as a 2nd release.
2nd shunt release (Y2) 3AX1101
Transformer-operated releases (Y4, Y5) 3AX1102, (Y6) 3AX1104
The second shunt release Y2 is installed whenever more
than one shunt release is needed.
In this version, the electrical "open" command is passed
by means of a magnet armature to the "OPEN" latch by
release of an energy storage mechanism, thus opening
the vacuum circuit-breaker module. This opening sole-
noid is not designed for continuous operation. Any nec-
essary varistors and rectifiers are integrated in the
Power consumption is approximately 60 W / VA
The transformer-operated releases Y4, Y5 or Y6 consist
of an energy storage mechanism, an unlatching fixture
and an electromagnetic system. If the tripping current is
exceeded (90 % of the transformer-operated release's
rated current), the energy storage mechanism is
unlatched, thus initiating opening of the vacuum circuit-
breaker module.
For use of the transformer-operated release, matching
transformers are also needed for matching, in addition to
the main current transformers.
Power consumption for 0.5 A and 1 A ≤ 6 VA at ≤ 90 %
of the transformer-operated release's rated current and
with open armature.


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