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
Figure 37: 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.
3.12.1.3 Dual single-pole signal/trip output contact SO3
The dual parallel-connected, single-pole, normally open/form A output contact SO3
has a continuous rating of 5 A but has a lower breaking capacity than the other POs.
When used in breaker tripping applications, an external contact, such as breaker
auxiliary contact, is recommended to break the circuit. When the application
requires, an optional BIO card with HSO contact can be ordered with the protection
relay.
1MRS757644 H
Basic functions
620 series
Technical Manual
115
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