| 摘要 |
<p>The temp. time switch comprises a thick film resistor (12) secured to an indeformable transparent plastics box (8) containing a conductor (3) on one inner surface supporting a fixed contact (4) engaging a movable contact (2) supported on a leaf spring (1). The interior of the box is closed by two plastics cross pieces (6,7) and resin (9) through which conductors (10) pass for the contacts (2,4). The leaf has two hooks (11) at set positions along its length into which the two ends of a bimetal strip (5) are sprung. The switch conveniently has a length 15-20mm, with 5-8mm and thickness 3mm. The switch is of small dimensions and operates with only a small amount of heat generated, the box having a low thermal capacity.</p> |
