ABB Relion 611 Series, Technical Manual

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3.12.1.2 Double-pole power outputs PO3 and PO4 with trip circuit supervision
The power outputs PO3 and PO4 are double-pole normally open/form A power
outputs with trip circuit supervision.
When the two poles of the contacts are connected in series, they have the same
technical specification as PO1 for breaking duty. The trip circuit supervision hardware
and associated functionality which can supervise the breaker coil both during closing
and opening condition are also provided. Contacts PO3 and PO4 are almost always
used for energizing the breaker trip coils.
PO3
PO4
TCS1
TCS2
X100
16
24
21
23
20
22
17
15
19
18
GUID-5A0502F7-BDC4-424A-BF19-898025FCCBD7 V1 EN
Figure 24: Double-pole power outputs PO3 and PO4 with trip circuit supervision
Power outputs PO3 and PO4 are included in the power supply module located in slot
X100 of the protection relay.
3.12.2 Signal output contacts
Signal output contacts are single-pole, single (normally open/form A or change-over/
form C) signal output contacts (SO1, SO2,...) or parallel connected dual contacts.
The signal output contacts are used for energizing, for example, external low burden
trip relays, auxiliary relays, annunciators and LEDs.
A single signal contact is rated for a continuous current of 5 A. It has a make and carry
for 0.5 seconds at 15 A.
When two contacts are connected in parallel, the relay is of a different design. It has
the make and carry rating of 30 A for 0.5 seconds. This can be applied for energizing
1MRS757454 D
Section 3
Basic functions
611 series 77
Technical Manual