11kV 3 Way RMU (consist of 2 Isolators & 2 Breaker)

a) RING SWITCH / ISOLATOR

1- 630 Amps. Triple pole, single break, 3-position ('ON', 'OFF' and 'EARTH') Ring Main
Switches, each with independent manual charged spring mechanism and fully rated earth
switch

1- Air insulated cable boxes with gland plate suitable for bottom entry of single run of 3-core
cable up to 300sq. mm.
1- Set (3nos) of Cable Bushings
1- Capacitive Voltage Indicators –LED Display
1- Mimic diagram on front panel, complete with status indicators (ON-OFF-EARTH)
1- Set of Right Angle Boots-NON TOUCH PROOF
1- Each fault Indicator

b) CIRCUIT BREAKER / VCB
1- 630 Amps, Triple pole, Vacuum Circuit Breaker, with independent manual charged
spring mechanism and fully rated earth switch, with provision for earth of the cable. Earthing
of the outgoing cable is achieved by the use of CB in series with the off- load disconnector
/selector switch. This enhances the making capacity of the earth switch.

1- Air insulated cable box with gland plate suitable for bottom entry of single run of 3-core cable
up to 300sq. mm
1- Over current & Earth Fault Relay with digital display & Self Powered (Make: CGL, Type: CGI
14S)
1- Set of current transformers for protection circuit mounted on Cable bushings / cable box of
ratio 200-100/1A, 5P10, 2.5VA
1- Capacitive Voltage Indicators –LED Display
1- Mimic diagram on front panel, complete with status indicators (ON-OFF-EARTH)
1- Epoxy Moulded low energy Tripping Coil for tripping the circuit breaker in fault condition
1- Local 'PULL TO TRIP' mechanism for emergency trip
1- Set of Right Angle Boots-NON TOUCH PROOF

c) GENERAL
The combined unit shall consist of the following:
1- Set of 630 Amps continuously rated COPPER bus bars
1- Set of positive standard mechanical interlocks to avoid unsafe operation
1- Provision for padlocking for Open, Close, Earth position in correct sequence
1- Manometer for indicating SF6 gas pressure with green & red zone
1- Set of hooks strong enough to take the load of entire unit while lifting by means of crane
1- SF6 tank of 3mm stainless steel, robotically welded construction (having degree of protection
IP67)
1- Outer Enclosure (cladding) constructed with Galvatite sheets (having degree of protection
IP54)
1- External stud for earthing connections
1- SF6 gas recharging facility
Jointing Box – As per requirement

d) PAINT SHADE
The unit shall be painted in RAL7035 paint shade