H - Electricity – 02 – H
Patent
H - Electricity
02
H
306/188, 309/40,
H02H 5/04 (2006.01) A47J 27/21 (2006.01) H01H 37/00 (2006.01) H01H 37/74 (2006.01) H05B 1/02 (2006.01)
Patent
CA 1206505
-1- Immersed Element Protection Abstract of the Disclosure An element protector unit for an electrically heated water boiling vessel comprises primary and secondary bimetals (31,32) responsive to the element head temperature and each arranged for actuating a respective one of primary and secondary switching contacts (11,12) connected in the line and neutral sides of the element supply via respective push rods (38,44). The secondary bimetal (32) is arranged to break later than the primary bimetal (31) in a dry switch-on or boil dry situation giving rise to excessive element temperatures, and to reset before the primary in a reducing temperature situation. The secondary bimetal (32) and associated switch contacts (12) provide back up protection in the event of failure of the primary protection on account for example of welding of the primary switch contacts (11). A neon warning lamp connected across the secondary contacts (12) will be lit only if the secondary contacts open with the primary contacts closed and thus indicates failure of the primary protection. An advantageous manually releasable latching arrangement for the primary and/or secondary switching contacts also is disclosed.
423560
Fletcher Keith
Naylor Peter W.
Phillips Richard A.
Kirby Eades Gale Baker
Otter Controls Limited
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