A Pole Mounted Sub-station is a large, free
standing, outdoor electrical equipment that is
mostly located in residential places. Its main
purpose is to step-down the lethal 11kV to
415/240V for light, commercial and
residential loads (consumers)
The 11kV line is connected to the Step-Down
Transformer (11kV/415V) though a gang
isolator and fuses. The lighting arrestors are
installed on the H.T side to protect the Sub-
Station from lightening strokes.
The transformer steps down the 11kV to
415V, 3phase, 4-wire supply. The voltage
between any two lines is 415V, and between
any line and a phase is 240V. The Oil Circuit
Breaker (O.C.B), installed on the L.T
sideautomatically isolates the transformer
from the consumers in case of any fault. The
Pole Mounted Sub-stations are generally used
for transformer capacity up to 200kVA
GANG OPERATED AIR BREAKER SWITCH
Gang operated Switches or G.O Switches as they are
commonly known are switching devices used in overhead
They are called Gang Operated as they are operated in a
Gang, all three switches together, using a single
mechanism. They are also called air-break switches as
they use air as the breaking medium or G.O.D.(Gang
operated Disconnector) switch
These switches do not have any load-breaking
capacity. They can only be operated when the transformer
is on no-load and only the small magnetizing current
flows through them. A substation must be disconnected
from the load it is feed and only then can these switches
located on the incoming lines of the substation be
A lightning arrester is a device used on electrical power
systems and telecommunications systems to protect
the insulation and conductors of the system from the
damaging effects of lightning. The typical lightning
arrester has a high-voltage terminal and a ground
terminal. When a lightning surge (or switching surge,
which is very similar) travels along the power line to
the arrester, the current from the surge is diverted
through the arrestor, in most cases to earth.
HORN GAP FUSE
We offer Dropout Fuse/Horn Gap Fuse/Fuse
Element that are used in electric transmission
lines and over heads and are made up of best
grades of mild steel which is galvanized, contact
made from Electrolytic copper or copper alloy.
Low Contact resistance through the life of switch.
Sturdy design of current carrying parts.
Robust design and construction.
Smooth and trouble free operation
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