Plug-In Circuit-Breakers; Gas Pressure Monitoring Device (On Request) - ABB HD4/R Installation And Operating Instructions Manual

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Withdrawn: Main circuits and auxiliary circuits disconnected.
Circuit-breaker completely withdrawn from the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
HD4/UniAir
The HD4/UniAir 2R plug-in circuit-breaker can be set in the
following positions:
Plugged-in: Main circuits and auxiliary circuits connected
Isolated:
Withdrawn: Main circuits and auxiliary circuits disconnected.
5.6 Gas pressure monitoring device (on
request)
The device for signalling the state of the SF
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.
HD4/S
1
1
3
2
4
Key
1 Isolating contacts
2 Wheels
3 Release lever
Trolley (on request)
4
5 Connector
Figure 5
Main circuits disconnected - auxiliary circuits
connected (test position)
Main circuits disconnected - auxiliary circuits dis-
connected (totally isolated)
Circuit-breaker completely withdrawn from the
compartment.
gas is supplied on
6
1
1
2
5
11