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Products  /  Function  /  Relay Mounting Accessories  /  M Series Enclosures

M Series Enclosures

  • Suitable for 19 inch, 4U high rack mounting
  • Suitable for flush panel mounting
  • M4 screw terminations
  • Stud termination possible
  • Simple screw (M4) mounting from front of panel
  • Projection & semi-projection mounting possible
  • 4U high 19″ rack mounting frame available
  • Size 2, 4 & 8 blanking plates
  • CT shorting switches available
  • Sealable front cover
  • IP5x category 2 dust protected
  • IP4x rated for solid ingress
  • Rugged metal construction
  • Made in Australia

M Series Modular Case System

The M Series range of protection relay enclosures has been designed with flexibility in mind. Only three versions are required to meet a wide range of applications. Both the size 2 & size 4 case are suitable for both flush panel & 19 inch 4U high rack mounting. The design utilizes a draw out chassis for ease of installation & maintenance. M4 screw terminals with captive lock washers are provided with optional CT shorting switches. The M Series cases are of metal construction for durability & screening from radiated electrical noise. Select from three versions as follows:


  • 2M28  Size 2 28 terminals 1/8 width 4U high
  • 4M28  Size 4 28 terminals 1/4 width 4U high
  • 4M56  Size 4 56 terminals 1/4 width 4U high


S Short Cases from August 2005

From August 2005 the M Series case range was reduced in length by 18mm to 217mm & is indicated in the product case drawings by the -S code (For example 2M28-S indicates a “short” case version).

This change has the effect of increasing the space between the case terminals & the rear of the cubicle. When mounted in a swing door the reduced case length is a distinct advantage.

Refer to the specific product Technical Bulletins to determine the case length. When purchasing replacement modules it is important to check the case length required. This can be done by quoting the old module serial number to the factory.

MSERIES Technical Bulletin

ACAD 2000 drawing files may be downloaded for each M Series case model from the download links (.zip format). Use Save command at the prompt.

Select from three versions as follows:

  • 2M28 Size 2 28 terminals 1/8 width 4U high
  • 4M28 Size 4 28 terminals 1/4 width 4U high
  • 4M56 Size 4 56 terminals 1/4 width 4U high


ACAD 2000 drawing files are also provided for the full range of M Series case accessories & front panel layouts. These are useful when building up a cubicle drawing to indicate the position of each relay model.