4
I. Introduction
All the installation, putting into service, run-
ning and maintenance operations must be
carried out by suitably qualified personnel
with in-depth knowledge of the apparatus.
This publication contains the information required for installing
and putting the following medium voltage circuit-breakers into
service:HD4/R,HD4/S,HD4/UniAir,HD4/UniMix,HD4/R-SEC.
Please read the manual carefully to ensure that the product is
used correctly.
Refer to the relative instructions in order to assemble the ac-
cessories and/or spare parts correctly.
Similarly to all the apparatus we manufacture, the HD4/R,
HD4/S,HD4/UniAir,HD4/UniMix,HD4/R-SECcircuit-breakers
are also designed for different installation configurations.
However,thesedevicescanbesubjectedtofurthertechnical-
construction modifications (at the customer’s request) so as to
adapt them to special installation requirements.
Consequently,themanualmaynotcontaininstructionscon-
cerning special customized configurations.
Besidesthismanual,itisthereforealwaysnecessarytoconsult
the latest technical documentation (electric circuit and wiring
diagrams,assembly andinstallation drawings,any protection
coordination studies, etc.), especially regarding any variants
requested in relation to the standard configurations.
Only use original spare parts for maintenance operations.
Please also consult the technical catalogue of the circuit-
breaker and the spare parts catalogue for further details.
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