(57) This device comprises:
- a first lever (7,7a,7b) having a first arm (7) actuated by the release device, and
a second arm (7a) acting on an engagement element (10),
- a second lever having a first arm (11,11a) engageable with said engagement element
(10) and a contrast arm (11e) acting on a biasing spring (3),
- a third lever rigidly associated with a resetting knob and having a first arm loading
said spring upon each resetting and a second arm (12) in contact with the contrast
arm and connected to a pusher rod (13) for actuating a release lever (14),
- a connecting rod (15) pivoted to the knob (1) and said contrast arm (11e) for keeping
the second lever in position after each resetting, so that upon each actuation of
the first lever (7), the second lever (11,11a,11e) is disengaged from the engagement
element (10) and can rotate freely, the third lever (12,12a,12b) rotates under the
thrust of the preloaded spring (3) and the connecting rod (13) moves towards the switch
release lever (14), thus causing contact opening.
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