36
S75I = Contact for electrical signalling of
circuit-breaker in connected
position, located in the enclosure
(see note B)
SC = Pushbutton or contact for the circuit-
breaker closing
SO = Pushbutton or contact for circuit-
breaker opening
SO3 = Contact for circuit-breaker opening
by means of YO3 solenoid
TI/L1...L3 = Current transformer on phases L1-
L2-L3 (note C)
TI/O = Toroidal current transformer for
measuring the earth fault current
(see note F)
Uaux. = Auxiliary power supply voltage (see
note D)
W1 = Serial interface with the control
system (EIA RS485 interface of
PR512/PD relay (note E)
X = Circuit-breaker control circuit
connector (note B)
XK1 = PR512 release current circuit
terminal box
XK2...XK6 = PR512 release auxiliary circuit
connectors
XZ = Terminal box in switchboard (see
note B)
YC = Circuit-breaker shunt closing
release
YO1 = Circuit-breaker shunt opening
release
YO3 = Circuit-breaker opening solenoid
with trip for overcurrent
ELECTRICAL CIRCUIT DIAGRAM
Caption
* = See note indicated by the letter
K51 = Microprocessor-based type PR512/
P (protection) or PR512/PD (protec-
tion and dialogue) type overcurrent
release, with the following protec-
tion functions (see note C):
– against overload with long
definite, inverse, very inverse or
extremely inverse trip time
– against short-circuit with definite
short trip time
– against earth fault with long
definite, inverse, very inverse or
extremely inverse trip time (with
the PR512/P unit this function is
only supplied on request)
– against earth fault with definite
short time trip (with the PR512/P
unit this function is only supplied
on request)
K51/YC = Closing command from PR512/PD
release
K51/YO = Opening command from PR512/PD
release
K51/YO3 = Contact for electrical signalling of
YO3 solenoid tripped due to
overcurrent
K51/µP = Contact for electrical signalling of
anomalies in microprocessor
operation
Q/... = Circuit-breaker auxiliary contacts
S33M = Spring charging motor limit contact
S43 = Remote/local control setting
change-over switch
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