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Isotech India Pvt. Ltd.
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Ring Main Unit

Ring Main Unit

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Product Description

The AIR 12 series cubicles enter into the typical schemes of M.V. Secondary distribution and are identified as:

IL:Line switch panel

  • TP: Transformer protection switch panel
  • AP: Interruption panel

Type designation coding

The panels are identified by a code composed in the following way:

  • -Logo that indicates the type
  • -sequence of figures defining the electrical characteristics and namely:
  • -Rated voltage (kV)
  • -Rated thermal current (A)
  • -Rated short time current for 1 sec. (kA)

    • Designation examples: IL 12-400-20 this is:

  • -IL:incoming/outgoing feeder
  • -12: rated voltage 12kV
  • -400: rated thermal current 400A
  • -20: rated short-time current 20kA(Is)


 Rated voltage
        kV          7.2         12
 Power frequency apply voltage for 1 min.
        kV          20         28
 Lighting impulse test voltage
        kV          60         75
 Rated current
         A      400/630      400/630
 Rated short time current      (kAxls)          25          20
 Rated making current
       kA
          62.5          50

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Isotech India Pvt. Ltd.
Plot no-1, Vijay Vihar, Behind IBM (Star Mall) NH-8, DLF Silokhra,Gurugram - 122001, Haryana, India
Mr. Rajeev Jakhar (Director)


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