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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,withrhlateraloperatingmechanism(upto36kV)
– Plug-in,forUniSwitch,UniAirandUniMixswitchgear.
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-
breakersandforcircuit-breakersforUniSwitch,UniAir,UniMix
and UniSec switchgear.
Each pole consists of an epoxy resin enclosure which houses
alltheactiveparts,thekinematismofthemovingcontacts,the
mediumvoltageterminalsandthearcingchambers,immersed
in SF
6
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-
incircuit-breaker),basicwiringfortheconnectionofelectri-
cal accessories.
NOTE. The basic version is always equipped with shunt open-
ingrelease,asetof5open/closedauxiliarycontacts,keylock
and spring loading lever.
Figure 3
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