10
2
PR 512/P
PR 512/PD
Signalling outputs
•
Signalling output by means of closing contact.
A closing contact is available to signal relay trip
(K51/YO3).
The contact is of the bistable type and belongs to
a relay which keeps its sate even with a power cut
and until the RESET operation.
After protection trip and circuit-breaker opening,
the contact can be reset by means of the RESET
pushbutton on the front of the relay, ensuring one
of the following conditions:
a) 24 Vdc auxiliary voltage present (display lit);
b) circulating primary current higher than 0.2 x In
(display lit with indication of the circulating
current);
c) application of the TT2 unit to the TEST connec-
tor on the front of the release (optional acces-
sory).
N.B. This signalling contact is not enabled if a remote
circuit-breaker opening command is given. Resetting
takes place 1 s after the pushbutton is pressed.
•
Microprocessor fault signalling output.
A closing contact is available to signal a perma-
nent fault in the microprocessor.
The contact is of the bistable type and belongs to
a relay which keeps the state even in the absence
of the power supply and until the RESET opera-
tion).
Technical data of the relay contacts
The signalling relay contacts have the following
electrical characteristics:
– maximum interrupted current 0.8 A
– maximum interrupted voltage 110 Vca/Vcc
– maximum interrupted load at 24 Vdc:
– inductive (L/R = 7 ms) 10 W
– resistive 24 W
– maximum interrupted load at 48 Vac:
– inductive (cosj = 0.4) 15 VA
– resistive 30 VA
– contact/contact insulation 500 Veff
– contact/coil insulation 1000 Veff
Measuring function
The liquid crystal display allows the most highly
loaded phase current to be shown (this measure-
ment is a function of the rated current of the CT set
by means of Dip Switches on the front of the unit).
When there is no auxiliary power supply, the
minimum value displayed is 0.21 x In single-
phase and 0.18 x In two-phase. With an auxiliary
power supply, it guarantees a minimum value
displayed of 0.05 x In. Under this value -LL- (Low
Load) is displayed.
Precision is 5% ± 1 LSD (Least Significant Digit)
for current values from 0.5 to 1.5 x In.
CHARACTERISTICS AND ORDERING CODES
Ordering codes
Protection relay
Description Code UXAB
PR 512/P (50-51) 399101001
PR 512/P (50-51-50N-51N) 399101002
PR 512/PD (50-5150N-51N + Dialogue) 399101003
TT2 test unit
Description Code UXAB
TT2 379602231
Opening solenoid (YO3)
Description Code UXAB
Solenoid for HD4 circuit-breaker 349700311
External toroidal transformer
Description Code UXAB
Toroid with closed core
internal diameter 110 mm - 50/1 A 379602301
Toroid with split core
internal diameter 110 mm - 50/1 A 379602302
PR 512/PD
with dialogue
TT2
test unit
Opening
solenoid YO3
External toroidal
transformer
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