Siemens SIMATIC NET Operating Instructions Manual page 26

Installation
4.3 Installation on a DIN rail
Removal
To remove the device from a DIN rail, follow the steps below:
1. If the extender is connected to a basic device, disconnect the extender, see section
"Fitting an extender (Page 29)".
2. Release the DIN rail catch on the bottom of the device using a screwdriver.
3. Pull lower part of the device away from the DIN rail.
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Extender for SCALANCE XM-400
Operating Instructions, 05/2014, C79000-G8976-C332-03