VEGA MoRoS Modem - ISDN 1.3 - Manual (Page 26)

Mounting MoRoS Modem - ISDN 1.3
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The plastic spring of the snap-in hook is pulled apart.
3. While you hold the plastic spring of the snap-in hook stretched apart, pull
the MoRoS Modem - ISDN 1.3 away from the DIN rail.
4. De-hook the MoRoS Modem - ISDN 1.3 and take it off, perpendicularly to the
DIN rail.