3 MECHANICAL IMPLEMENTATION
All products based on the Px4x platform have common hardware architecture. The hardware is modular and
consists of the following main parts:
● Case and terminal blocks
● Boards and modules
● Front panel
The case comprises the housing metalwork and terminal blocks at the rear. The boards fasten into the
terminal blocks and are connected together by a ribbon cable. This ribbon cable connects to the processor in
the front panel.
The following diagram shows an exploded view of a typical product. The diagram shown does not
necessarily represent exactly the product model described in this manual.
Figure 3: Exploded view of IED
3.1 HOUSING VARIANTS
The Px4x range of products are implemented in a range of case sizes. Case dimensions for industrial
products usually follow modular measurement units based on rack sizes. These are: U for height and TE for
width, where:
● 1U = 1.75 inches = 44.45 mm
● 1TE = 0.2 inches = 5.08 mm
The products are available in panel-mount or standalone versions. All products are nominally 4U high. This
equates to 177.8 mm or 7 inches.
The cases are pre-finished steel with a conductive covering of aluminium and zinc. This provides good
grounding at all joints, providing a low resistance path to earth that is essential for performance in the
presence of external noise.
The case width depends on the product type and its hardware options. There are three different case widths
for the described range of products: 40TE, 60TE and 80TE. The case dimensions and compatibility criteria
are as follows:
MiCOM P747 Chapter 3 - Hardware Design
P747-TM-EN-1 27
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