ABB HD4/R, Installation And Operating Instructions Manual, Page: 11 / 38

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HD4/UniAir
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HD4/S
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5.5 Plug-in circuit-breakers
The plug-in circuit-breakers (see fig. 5) are available for UniS-
witch and UniAir switchgear.
They are basically derived from a fixed circuit-breaker to which
wheels, isolating contacts and a locking lever are applied.
HD4/S circult-breakers are used in UniSwitch switchgear. The
circuit-breakers used in P1/E UniAir switchgear are the HD4/
UniAir plug-in type while HD4/UniAir 2R plug-in circuit-breakers
are used in P1E/2R units.
HD4/UniMix-F fixed circuit-breakers equipped with a drive slide
that can be bolted after racking-in to the switchgear are used in
UniMix switchgear. They also feature a pre-engineered enclo-
sure with frame in the IP30 version and in the reinforced version
for internal arc.
HD4/R-SEC circuit-breakers are used in UniSec switchgear.
The circuit-breakers can only be racked-out in safe conditions,
i.e. with the isolators open and the earthing switches closed.
Plug-in circuit-breakers are equipped with a locking lever that
prevents them from being racked-out when closed.
A truck for racking-out the circuit-breaker is available in order
to facilitate this operation.
The HD4/UniAir plug-in circuit-breaker can be set in the follow-
ing positions:
Plugged-in
: Main circuits and auxiliary circuits connected
Withdrawn : Main circuits and auxiliary circuits disconnected.
Circuit-breaker completely withdrawn from the
compartment
Key
1
Isolating contacts
2 Wheels
3 Release lever
4 Trolley (on request)
5 Connector
The HD4/UniAir 2R plug-in circuit-breaker can be set in the
following positions:
Plugged-in : Main circuits and auxiliary circuits connected
Isolated : Main circuits disconnected - auxiliary circuits
connected (test position)
Main circuits disconnected - auxiliary circuits dis-
connected (totally isolated)
Withdrawn
: Main circuits and auxiliary circuits disconnected.
Circuit-breaker completely withdrawn from the
compartment.
5.6 Gas pressure monitoring device (on
request)
The device for signalling the state of the SF
6
gas is supplied on
request and always has two intervention thresholds (low pres-
sure and insufficient pressure).
The following configurations can be obtained:
1) with contacts for remote signalling (normal, low and insuf-
ficient pressure);
2) as in point 1, plus a lock on circuit-breaker closure and a
choice between automatic opening or lock on opening;
3) as in point 2 plus three lamps for local signalling of the state
of the gas.
Figure 5