ABB HD4/R, Installation And Operating Instructions Manual, Page: 9 / 38

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5. Description
5.1 General information
HD4/... circuit-breakers made with the separate pole con-
struction technique. They are sulphur hexafluoride insulated
for indoor installation and are life-long sealed pressure devices
(Standards IEC 62271-100 and CEI-EN 62271-100).
Refer to the technical catalogue for the electrical performance.
The following versions are available:
– Fixed, with rh lateral operating mechanism (up to 36 kV)
– Plug-in, for UniSwitch, UniAir and UniMix switchgear.
Depending on the version (excluding 36 kV), they can be
equipped on request with two or three current sensors and
with a PR521 or REF 601 series device for protection against
overcurrents (only REF601 for HD4/R-SEC).
The three poles, the operating mechanism and any optional
accessories used are assembled on a sturdy bearing frame.
The metal frame is equipped with wheels for 36 kV circuit-
breakers and for circuit-breakers for UniSwitch, UniAir, UniMix
and UniSec switchgear.
Each pole consists of an epoxy resin enclosure which houses
all the active parts, the kinematism of the moving contacts, the
medium voltage terminals and the arcing chambers, immersed
in SF
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gas.
Reference Standards
– IEC 62271-100
– CEI-EN 62271 (dossier 7642).
5.2 Basic configuration
The basic coded versions of the circuit-breakers are always
three-pole and comprise the following equipment (fig. 3):
1 closing pushbutton
2 opening pushbutton
3
circuit-breaker open/closed indicator
4 manual operating mechanism
5 mechanical indicator for closing springs
6
operation counter
moreover:
terminal board for fixed circuit-breaker (connector for plug-
in circuit-breaker), basic wiring for the connection of electri-
cal accessories.
NOTE.
The basic version is always equipped with shunt open-
ing release, a set of 5 open/closed auxiliary contacts, key lock
and spring loading lever.
Figure 3