Thermally controlled electrical switching device having a snap-a

Details Thermally controlled electrical switching device having a snap-a Thermally controlled electrical switching device having a snap-a

1995-10-10

1999-02-09

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337333, 337379, 337111, H01H 3752, H01H 3774

Patent

active

058700137

ABSTRACT:
The invention relates to a thermally controlled electrical switching device including a temperature control (1) having a snap-action switch (2) including a fixed contact (4) and a movable contact (3) connected to a metal snap-action switching spring (9), and having a bimetallic element (5) which influences the movement of the movable contact. In order to minimize the heat produced in the mechanically loaded parts (17, 18) of the snap-action switching spring (9) the switching devices limits the current through these mechanically loaded parts. These devices may include an electrically well conductive layer (30) provided on the non-mechanically loaded parts of the snap-action switching spring or a layer (31) having a high electrical resistance deposited on the mechanically loaded parts (17, 18).

REFERENCES:
patent: 3170998 (1965-02-01), Stahl
patent: 4254313 (1981-03-01), Baader
patent: 4507642 (1985-03-01), Blackburn
patent: 5111010 (1992-05-01), Kokubu et al.

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