Disconnectors as shown in the data sheet are intended to be
used for no-load medium voltage devices.
The disconnectors meet the
requirements of the IEC 129 standards.
All parts and frames made of steel
are galvanized and chromate coated.
The drive shafts are seated in bronze
bearings and this is why the material as such can not be subjected to
corrosion.
All parts of the current carrying path are made of drawn
electrolytical copper.
All components of the current carrying path,
designed for the rated current of Ir = 400 A are nickel-coated;
components to carry the Ir of 630 to 6300 A are silver coated (10
mm coat).
The corrosion-free compression springs
supply an adequate pressure for the operation of making contacts.
The
built-in earthing switches comply with the requirements of short-circuit
making capabilities.
The control of load disconnectors occurs through the
following:
- SHA hand operated drives (for load disconnectors mounted on the front
wall), with the possibility of both right-side and left-side mounting to the
load disconnector
- adaptor for "D" type drive, with an extension part (in case of
necessity, for load disconnectors mounted to the side wall)
- UM50 motor operated drives (mounted directly to the operating shaft of
load disconnector, usually installed on the left side)
- UM10, UM20 or UM30 motor operated drives (control and manipulation from
the front side of cubicle)
In case when the load disconnector is equipped with earthing
switch there is to be additional drive mechanism to provide for the control of
the earthing switch.
Under normal operating conditions it is not
necessary for the load disconnectors to undergo a preventive maintenance
during the period of ten years.
Supplementary material to the disconnectors
Additional switch |
in order to indicate the switching position the
disconnectors with built-in earthing switches can be equipped with
additional switches
The basic setup of switches can be modified
without the necessity to disassemble the disconnector, by using special
tools (such as when changing the contacts from making to breaking, or
changeover contact etc.). |
Interlocking magnet |
24 V, 60 V, 110 V and 220 V DC or 110
V and 220 V AC |
Motor operated drive |
see operated drives catalogue |
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