Installation 
  3.3 Installation on the DIN rail 
SCALANCE M874, M876 
Operating Instructions, 08/2018, C79000-G8976-C331-08 
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1.  Disconnect all connected cables. 
2.  Using a screwdriver, pull down the catch on the rear of the device. 
3.  Pull lower part of the device away from the DIN rail.