Rotary handle construction of an electrical switch

A rotary handle construction of an electrical switch comprises:

• a rotary handle being turnable around a first pivot axis between at least an open- and a closed-position,
• a locking latch being adapted in a first space formed into the rotary handle and being turnable around a second pivot axis between a locked position and a released position,
• a bottom ring being fixed in relation to the rotary handle,
• a locking pin also being adapted into the first space in the rotary handle and being movable in a longitudinal direction with the locking latch between a first position and a second position, the locking pin being in the first position positioned at a distance from the bottom ring allowing turning of the rotary handle in relation to the bottom ring, the locking pin protruding in the second position into a first opening in the bottom ring preventing turning of the rotary handle in relation to the bottom ring,
• a shaft adapter being adapted with a play in a nest formed in the rotary handle and receiving a drive shaft leading from the rotary handle to the electrical switch, the shaft adapter comprising a protrusion having a locking member,
• a torsion spring extending between the shaft adapter and the rotary handle, wherein the play in the nest permits a restricted rotational movement of the shaft adapter against the spring force of the torsion spring in relation to the rotary handle, wherein
• the locking pin comprises a groove, wherein the locking member in the protrusion of the shaft adapter settles in the groove thereby locking the locking pin in the first position in a situation in which the torsion moment acting on the rotary handle exceeds the spring force of the torsion spring acting on the shaft adapter in relation to the rotary handle.