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Notes
A) For the circuit-breaker auxiliary circuits, see
the specific diagram of the circuit-breaker
itself.
B) This diagram shows a withdrawable version
circuit-breaker but is also valid for fixed
version circuit-breakers. In that case, it is
necessary to short-circuit poles XK4-3 and
XK4-4 of the PR512/PD release. Moreover, the
circuit-breaker auxiliary circuits are terminated
at a terminal box called XV instead of at
connector X and at terminal board XZ.
C) When only 2 current transformers are provided
on phases L1 and L3 (only to be used with
networks with insulated neutral and negligible
earth fault currents), terminals XK1-3 and
XK1-4 of the PR512 must be short-circuited.
D) The Uaux. auxiliary power supply is needed to
guarantee that the following functions operate
correctly even without self-supply (primary
currents lower than 0.2 In):
– external opening control (SO3) and relative
signals (signalling lamp and optic indicator)
– current measurement
– earth fault protection and relative signals
(K51/YO3 and K51/mP signalling contacts,
signalling lamp and optic indicators)
– reset of signalling contacts and optic indica-
tors.
The Uaux. auxiliary power supply is always
needed to guarantee correct dialogue
operation (only for PR512/PD relay).
The presence of primary current
least one phase fitted with current transformer
ensures correct operation of all the protec-
tion, measuring and control functions.
E) For connection of the EIA RS485 serial line,
see the following documentation:
– examples of distribution of the EIA RS485
serial communication 401517
– requirements for cable laying for serial EIA
RS485 serial communication 601823.
F) The TI/O homopolar current transformer,
outside the circuit-breaker and with connec-
tions to be made by the customer, is only
supplied on request. Should the TI/O trans-
former not be used, short-circuit terminals
XK1-7 and XK1-8.
G) The K51/YO3 and K51/
have the following electrical characteristics:
– maximum interrupted current 0.8A
– maximum interrupted voltage 110Vdc -
100Vcc
– maximum interrupted load at 24Vdc
– inductive (L/R = 7ms) 10W
– resistive
– maximum interrupted load at 48Vac
– inductive (cos = 0.4) 15VA
– resistive
8
0.2 In on at
signalling contacts
24W
30VA.
37
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