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Ring Main Unit
Ring
Main Unit is of Indoor or Outdoor Type and can be
made extensible on both sides. It consists of
2 Units of 11 KV, 630 Amps, continuously rated, triple
pole, non automatic, quick break, air break,
fault making load breaking switches, with associated
busbars and connections for controlling an incoming/outgoing
11 kV feeder cable.
It is fitted with 630A copper busbar, mechanical
interlock, ON/OFF indicator and Cable terminating
box and one tee-off unit load breaking and fault making
switch comprising of one 11 KV, 630 Amps air break
switch fuse fitted to three busbars of 630 Amps continuously
rated with pull out type HRC fuse with clamp fixing
for receiving striker pin for controlling distribution
transformers. It is fitted with 630A copper busbar,
mechanical interlock, ON/OFF indicator and Cable terminating
box.
Ring Main Unit can also be provided with two number
Load Break Switch with one number tee-off Vacuum Circuit
Breaker with protective devices.
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