ABB RELION SMU615 Technical Manual page 64

Basic functions
3.9.1 Power output contacts
Power output contacts are normally used for energizing the breaker closing coil and
trip coil, external high burden lockout or trip relays.
3.9.1.1 Dual single-pole power outputs PO1 and PO2
Dual (series-connected) single-pole (normally open/form A) power output contacts
PO1 and PO2 are rated for continuous current of 8 A. The contacts are normally
used for closing circuit breakers and energizing high burden trip relays. They can be
arranged to trip the circuit breakers when the trip circuit supervision is not available
or when external trip circuit supervision relay is provided.
The power outputs are included in slot X100 of the power supply module.
Figure 24: Dual single-pole power output contacts PO1 and PO2
3.9.1.2 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.
64
PO1
PO2
X100
6
7
8
9
1MRS758407 C
SMU615
Technical Manual