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PR 512/P
PR 512/PD
PR 512/PD
with dialogue
10
CHARACTERISTICS AND ORDERING CODES
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).
Ordering codes
Protection relay
Description
PR 512/P (50-51)
PR 512/P (50-51-50N-51N)
PR 512/PD (50-5150N-51N + Dialogue)
TT2 test unit
Description
TT2
Technical data of the relay contacts
The signalling relay contacts have the following
electrical characteristics:
– maximum interrupted current
– maximum interrupted voltage
– maximum interrupted load at 24 Vdc:
– maximum interrupted load at 48 Vac:
– contact/contact insulation
– contact/coil insulation
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.
Opening solenoid (YO3)
Code UXAB
Description
399101001
Solenoid for HD4 circuit-breaker
399101002
External toroidal transformer
399101003
Description
Toroid with closed core
internal diameter 110 mm - 50/1 A
Code UXAB
Toroid with split core
379602231
internal diameter 110 mm - 50/1 A
TT2
test unit
– inductive (L/R = 7 ms)
– resistive
– inductive (cos = 0.4)
– resistive
Opening
solenoid YO3
2
0.8 A
110 Vca/Vcc
10 W
24 W
15 VA
30 VA
500 Veff
1000 Veff
Code UXAB
349700311
Code UXAB
379602301
379602302
External toroidal
transformer
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