9SIPROTEC 4/5, Injection Unit 7XT71, Product Information
C53000-B1174-C128-7, Edition 09.2016
6Design
6.1 General Structure
All electrical function groups are installed on a printed circuit board assembly. This
assembly also features a guide plate, an 18-pin plug connector and the front cover
forming a module that can be plugged in (in the following referred to as plug-in mod-
ule).
The plug-in module is installed in a 1/6 19" housing and is electrically connected to
the 18-pin terminal strip affixed to the rear plate. Contact springs connect the plug-
in module to the housing inside over a large area.
The electrical properties of the material used for the housing provide diversion and
shielding functions.
To connect the low-impedance protective conductor ( 4 mm
2
/AWG 12), the lower
part of the rear plate provides 2 contact points to which at least one copper
band/conductor must be fastened with M4 screws over a large surface. 2 additional
contact points above are provided for grounding the cable shieldings.
IP51 applies to the housing (flush mounting variant) and IP20 to the screw termi-
nals of the terminal strip. IP20 applies to the surface mounting variant of the device.
NOTE
The Injection Unit 7XT71 is available for panel surface mounting, panel flush
mounting or cabinet flush mounting, depending on the ordering code, see
Chapter 4.
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