ABB REF 542 - Single-pole power outputs (PO) and a high-speed single-pole power output (HSPO); Double-pole power outputs (PO)

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Technical Reference Manual, General
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The single-pole power outputs BIO2_7_PO1 and BIO2_7_PO2 as well as the high-
speed single-pole power output PS2_4_HSPO8 are outputs where the object to be
controlled is connected in series with two heavy-duty output relay contacts, see the
figure below. These outputs can be used for tripping purposes and for circuit breaker
and disconnector control.
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The double-pole power outputs BIO2_7_PO3 ... BIO2_7_PO6 are outputs where the
object to be controlled (e.g. a circuit breaker) is electrically connected between the
two relay contacts, see the figure below. These outputs can be used for tripping
purposes and for circuit breaker and disconnector control.
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+
-
PO1conn
CB
e.g.
BIO2_7_PO1,
BIO2_7_PO2
+
-
PO3conn
CB
e.g.
BIO2_7_PO3...
BIO2_7_PO6