Add-on state indicator for an enclosed D.C. power relay

Details Add-on state indicator for an enclosed D.C. power relay Add-on state indicator for an enclosed D.C. power relay

1982-09-24

1984-10-23

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

307116, 335 2, 335151, 340653, 340654, G08B 2100

Patent

active

044791178

ABSTRACT:
An add-on fault indicator comprising a magnetic reed switch (22) and a lamp (24) connected in series across relay contacts (10, 12, 14) with the reed switch mounted by a clamp (34) contiguous to the outer surface of the metal coil shell (6) so as to be closed by the magnetic field when the coil (2) is energized. A normal operation indicator lamp (26) is connected in series with the relay contacts to indicate closure of the latter to energize a load (20). Fault indicator lamp (24) lights if the contacts do not close when the coil is energized but is shunted by the contacts to remain unlighted when the contacts close properly.

REFERENCES:
patent: 3254171 (1966-05-01), Freeland et al.
patent: 3256425 (1966-06-01), Deeg
patent: 3312967 (1967-04-01), Levine
patent: 3355629 (1967-11-01), Schapira
patent: 3644886 (1972-02-01), Sabaroff
patent: 3979705 (1976-09-01), Hayden
patent: 4293131 (1981-10-01), Fellman et al.

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