7
Fig. 3. Block diagram for the feeder terminals type SPAC 315 C and SPAC 317 C
U1
Phase overcurrent and earth-fault relay module SPCJ 4D29
U2
Control module SPTO 1D6
U3
I/O module SPTR 2B17 or SPTR 2B18 for digital inputs and contact outputs
U4
Power supply module SPGU 240A1 or SPGU 48B2
U5
Energizing input module and motherboard SPTE 4F6 or SPTE 4F9
X0
Screw terminal strip
X1…X3
Multi-pole connector strips
Rx/Tx
Serial communication port
The relay case is made of an extruded alumin-
ium section, the collar is of cast aluminium and
the cover of clear UV-stabilized polycarbonate.
The collar is fitted with a rubber gasket provid-
ing an IP54 degree of protection by enclosure
between the relay case and the mounting panel.
The cover of the case contains two push-buttons
which can be used for scanning through the
displays of the feeder terminal. To reset the
operation indicators of the protection and to
use the local control push-buttons of the control
module, the front cover has to be opened.
The cover is locked with two finger screws
which can be sealed to prevent unauthorized
access to the front panel. The rubber gasket
between the cover and the collar ensures that the
cover, too, complies with the IP54 require-
ments. The opening angle of the cover is 145
°
.
Rx/Tx
X3
X1
X0
X2
O <-> I
I
P
Q
E
U2
U1
U3
U4
U5
Io >
Io >>
3I >
3I>>
3
∆
I/IN
TCF
