ABB HD4/R User Manual

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1
1
2
3
4
HD4/UniAir
5
HD4/S
1
1
2
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Withdrawn: Main circuits and auxiliary circuits disconnected.
Circuit-breaker completely withdrawn from the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Withdrawn: Main circuits and auxiliary circuits disconnected.
Circuit-breaker completely withdrawn from the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

ABB HD4/R Specifications

General

Brand	ABB
Model	HD4/R
Category	Circuit breakers
Language	English