Product Description

Type FW9 off-load switches are suitable for use in tropical zone, with a maximum ambient temperature of approximately 40 degrees Centigrade and an average temperature of approximately 28 degrees Centigrade with high humidity and heavy rainfall. The preferred operational altitude is up to 1800 m above sea level.

Electrical System

Type FW9 off-load isolator switch are designed for continuous operation on a 3-phase 3-wire 11kV, 15kV,22kV,24kV,27kVand 33kV,36kV,50/60Hz distribution system with the star-point of the source-point transformer earthed through an Arc Suppression Coil or Earthing Resistor.

Standards

Type IST off-load isolator switch are complied with relevant requirements of the following standards together with all current amendments;

IEC62271-102:2003 :High-voltage alternating-current disconnectors and earthing switches

IEC60129:1984    :Alternating current disconnectors and earth switches

IEC 60265-1:1998  :High voltage switches - Part 1:Switches for rated voltage above 1kV and less than 52kV

IEC 60694: 1996   :Common specifications for high-voltage switchgear and control gear standards

IEC 60815:1986    :Guide for the selection of insulators in respect of polluted conditions

BS EN ISO 1461     :Hot dip galvanized coatings on fabricated iron and steel articles- Specifications and test methods
General
Type FW9 off-load isolator switchs  are the vertical/Horizontal  mounting
Type for mounting on a single or H-pole structure for overhead lines or feeders from the energized sections.

Type FW9 off-load isolator switchs are compatible and ready for
installation on tubular steel poles and spun concrete poles.
The design are of an air insulated "rocking insulator"
type with two fixed insulator posts and one moving
insulator post per phase.

SPECIFICATIONS