Power Output Contacts; Dual Single-Pole Power Outputs Po1 And Po2 - ABB Relion SMU615 Technical Manual

Section 3
Basic functions
3.9.1
3.9.1.1
56
Power output contacts are used when the current rating requirements of the contacts
are high, for example, for controlling a breaker, such as energizing the breaker trip and
closing coils.
The contacts used for external signalling, recording and indicating, the signal outputs,
need to adjust to smaller currents, but they can require a minimum current (burden) to
ensure a guaranteed operation.
The merging unit provides both power output and signal output contacts. To guarantee
proper operation, the type of the contacts used are chosen based on the operating and
reset time, continuous current rating, make and carry for short time, breaking rate and
minimum connected burden. A combination of series or parallel contacts can also be
used for special applications. When appropriate, a signal output can also be used to
energize an external trip relay, which in turn can be confiugred to energize the breaker
trip or close coils.
Using an external trip relay can require an external trip circuit
supervision relay.
All contacts are freely programmable, except the internal fault output IRF.

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.

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.
1MRS758407 B
SMU615
Technical Manual