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Rx
Tx
Fig.3. Rear view of the overcurrent relay SPAJ 131 C
Specification of input and output terminals
Contacts
Function
1-2
Phase current I
1-3
Phase current I
4-5
Phase current I
4-6
Phase current I
7-8
Phase current I
7-9
Phase current I
10-11
External blocking signal (BS)
61-62
Auxiliary power supply.
When DC voltage is used the positive pole is connected to terminal 61.
65-66
Trip output 1 for the I> and I>> stages (TRIP 1)
68-69
Trip output 2 for the I> and I>> stages (TRIP 2)
80-81
Signal on tripping of the I> and I>> stages (SIGNAL 1)
77-78
Signal on tripping of stage I>>, starting of the I> and I>> stages (START1)
70-71-72 Self-supervision (IRF) alarm output. Under normal conditions the contact interval
70-72 is closed. When the auxiliary voltage disappears or an internal fault is detected,
the contact interval 71-72 closes.
Protective earth terminal
In single-phase applications it is recommended
that the energizing current is routed through
two energizing inputs of the relay connected in
series. This arrangement secures a faster opera-
tion time of the relay, in particular, at instanta-
neous operation.
1
61
2
62
TTL
3
65
4
66
5
68
6
69
7
80
8
81
9
77
70
78
71
10
72
11
(I
= 5 A)
L1
n
(I
= 1 A)
L1
n
(I
= 5 A)
L2
n
(I
= 1 A)
L2
n
(I
= 5 A)
L3
n
(I
= 1 A)
L3
n
The overcurrent relay SPAJ 131 C connects to
the fibre optic data communication bus by
means of the bus connection module SPA-ZC
17 or SPA-ZC 21. The bus connection module
is fitted to the D-type connector (SERIAL
PORT) on the rear panel of the relay. The opto-
connectors of the optical fibres are plugged into
the counter connectors Rx and Tx on the bus
connection module.
5
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