Datasheet

51
Current-Limiter
The breaking capacity of 3VU13 is 100kA upto 6A. However for
3VU circuit breakers with rated current of 8A and 10A the short-
circuit breaking capacity is 10kA. For circuit breakers with rated
current from 16A to 25A the short-circuit breaking capacity is 6kA.
In order to enhance the breaking capacity to 50kA, for these
ratings (8A to 25A), the current limiter can be used. Thus the
need of back up fuses is obviated.
The current limiter is connected in series with 3VU13 MPCB.
When a short circuit occurs, the limiter trips and in turn opens the
downstream MPCB. The auxiliary contacts of the current limiter
(1NO+1NC) can be used for signaling whether the limiter has
tripped or not.
Several MPCBs can also be connected at the output of a current
limiter. However the summation of current ratings of individual
MPCBs should not be greater than 56A.
Connection diagrams
a) Shunt release
b) Under voltage release
c) Integral auxiliary contacts
d) Additional auxiliary contact for separate mounting
e) Short circuit signaling contact
f) Auxiliary contact of current limiter
Diagram for 3VU13/16 and current limiter (applies for 3VU13 only)
Fuse Monitor 3VU1300-IMS00
Shunt release
Wiring diagram for Shunt release
for 3VU13/16
Wiring diagram for under voltage
release of 3VU13/16