Switches & Fuses

Switch Disconnectors, fuses and Base for Power Switching Application

 
 
 
 
 
 
 
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Product Description

The design of SDF units type IN1 is based on the innovative QUAD BREAK’ principle. This design enables a drastic reduction in the intensity of arc, which is produced at the time of breaking. During breaking the current path is broken at four places in series, thus the arc is reduced. This leads to less strain on the contacts and the life of the switch is increased.

The moving contacts are designed to make two parallel current paths, which produce high electro-magnetic attraction forces during high faults and increase the contact pressure, this eliminates chance of arcing at the contacts and allows the fuse to safely clear the fault. The self-cleaning contacts ensure wiping of deposits during each operation and increase the life of the contacts. Telescopic shaft feature enables the operating shaft extension up to 25mm.

Complete Safety :

  • The fuses in SDF units’ type IN1 are stationary and are isolated at both the incoming and outgoing ends, this offers complete safety for fuse replacement in OFF condition.
  • The switch mechanism is quick-make quick-break i.e. independent of operating speed. Positive ON/OFF indication is provided at the switch handle and mechanism assembly: however, clear physical contact position can be seen through inspection windows on the housing of the switch.
  • The complete range from 32A to 800A is offered in TPN and 4-pole
    (TPSN) versions. Incase of switched neutral (TPSN) version, the neutral is advance (i.e. makes before and breaks later than the main poles) and is housed in the same housing without any Add-on attachment.
  • Phase barriers are provided as a standard feature to prevent any accidental fault between the fuses.

Product Technical Specification

  • Brand : Indoasian
  • Model : Various
  • Conforming to IS/IEC 60947 – 3
  • Rated insulation voltage: 1000V AC/1500V DC
  • High Breaking capacity: AC23A
  • Contact position clearly visible through inspection windows
  • ON/OFF position clearly indicated on handle and on switch mechanism
  • Independent manual operation
  • Front operated rotary handle with door interlock
  • Padlock Feature
  • Telescopic Shaft
  • Storage Ambient Temperature: -25°C to 55°C
  • Working Ambient Temperature: -20°C to 45°C
  • Relative Humidity: Maximum 95%
  • Rated frequency: 50/60Hz
  • Auxiliary Contacts:
    1NO + 1NC
    2NO + 2NC