ABB REF 542 - Signal outputs (SO)

1MRS750527-MUM
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Technical Reference Manual, General
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45
If the power outputs BIO2_7_PO3 ... BIO2_7_PO6 are used as single-pole outputs,
the object to be controlled (e.g. a circuit breaker) is electrically connected in series
with the two relay contacts to provide sufficient current breaking capacity, see the
figure below.
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The signalling relay outputs (BIO1_5_SO_) are not heavy-duty outputs and thus
they cannot be used for controlling e.g. a circuit breaker. Available relay contacts
are either Normally Open or Normally Open/Normally Closed type (NO or NO/
NC), see the figure below. These outputs can be used for alarming and other
signalling purposes.
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+
-
PO2conn
CB
e.g.
BIO2_7_PO3...
BIO2_7_PO6
nonc
NO/NC
NO
e.g.
PS1_4_SO1
e.g.
BIO1_5_SO1