Siemens SIPROTEC 5 Series Hardware Description page 159

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Figure 5-2
(1) Extreme right expansion module of the 1st device row
(2) Connecting cable
(3) 2nd device row
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Figure 5-3
(1) Angle rail
(2) 2 Rubber seals
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Figure 5-4
(1) Device bus of the outermost right expansion module of the 1st device row
(2) Sealing plate
SIPROTEC 5, Hardware Description, Manual
C53000-G5040-C002-C, Edition 10.2017
Expansion with 2nd Device Row
Angle Rail
Sealing Plate and Adaptor Bracket for the Expansion Module of the 1st Device Row
Working on the Device
5.2 Expanding Modular Devices
159