Push-wire
terminals with disconnection slot in the housing:
A screwdriver or release mandrel is guided through
the disconnection slot and a light pressure is then exerted on the
contacts. The wire can then be easily disconnected.
Stripping the connecting lead in the case of clamp-type
terminals:
0.5 - 1,5 mm˛ = 8,0+1,0
1,5 - 2,5 mm˛ = 12,0+1,0
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* Does not apply to push-wire terminals in halogen lampholders
Overview 
Push-wire
terminals with disconnection slot in the housing: