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33KV Air Break Switch.
Overhead Line Isolator
Substation Isolator
Rated voltage
36 kV
36 kV
Rated frequency
50 Hz
50 Hz
Rated lightning impulse withstand voltage
200 kV
200 kV
Rated power frequency withstand voltage, dry
95 kV
95 kV
Rated normal current
400 Amps
800 Amps
Rated short time withstand current for 3 sec, min.
18.0 kA
18.0 kA
Minimum creepage distance of insulators
900 mm
900 mm
  -> The Isolator Disconnector is  shall be designed and constructed in accordance with IEC 129 and IEC 60694.

-> The Isolator Disconnector is shall be designed for three phase operation. Each switch pole shall incorporate three insulators mounted on hot      dipped galvanized steel underbase. The centre insulator shall be moveable to effect contact operation.

-> The Isolator Disconnector is shall be of the vertical opening type, suitable for both vertical and horizontal mounting.

-> The Isolator Disconnector is shall be suitable for manual operation by means of push – pull reciprocating mechanism. The mechanism shall be      interlocked for safe operation. It shall be supplied complete with the operating mechanism.

-> All the three switch poles shall be arranged so that the phase units are mounted independently and then finally interconnected with coupling      tubes so as to ensure simultaneous operation of all switches by drive rods and an operating handle.

-> The drive rod shall be fitted with an insulation insert to electrically isolate the top section from the lower section of the rod.

-> All steel parts shall be hot dip galvanized to BS 729. The minimum coating of galvanizing required is 80 microns.

-> The Isolator Disconnector is shall be designed such that in fully open position, it shall provide adequate electrical isolation between the      contacts on all the three phases. It shall conform to the requirement as single point isolation for safety.

-> The Isolator Disconnector is shall be fitted with spring arc horns to enable the isolator interrupt loads of up to 10 Amps.

-> All current carrying parts of the Isolator Disconnector is shall be made of electrolytic high conductivity copper with switch contacts hard      drawn and silver plated.

-> The Isolator Disconnector is shall be fitted with clamp connectors for Aluminium (ACSR) conductor of up to 18.2mm diameter.

-> Provision shall be made for padlocking in both CLOSED and OPEN positions.
Redesigned & Developed By:
Brian - HC & S LTD