Three terminal solid state pilot light

Details Three terminal solid state pilot light Three terminal solid state pilot light

1982-03-18

1984-08-07

Dixon, Harold

Electric lamp and discharge devices: systems

With signal, indicator, or alarm

Radiant energy responsive control type

315129, 315312, 250551, 340641, H01J 160

Patent

active

044646054

ABSTRACT:
In a pilot light usable for monitoring industrial control circuits a set of three terminals comprising a signal terminal, a test terminal and a line, or return terminal, with a signal circuit network between the signal and line terminals that supplies current to a lamp when a voltage is applied to the signal terminal, and with a test circuit network between the test and line terminals that supplies current to the lamp when a voltage is applied to the test terminal. Each circuit network includes a triac and a trigger branch subcircuit for controlling the associated triac.

REFERENCES:
patent: 2839741 (1958-06-01), Kratville
patent: 3040243 (1962-06-01), Weiss
patent: 3304431 (1967-02-01), Biard
patent: 3335249 (1967-08-01), De Smidt et al.
patent: 3739334 (1973-06-01), Hocking
patent: 3840801 (1974-10-01), Kellogg et al.
patent: 3938000 (1976-02-01), Higashide
patent: 4019128 (1977-04-01), Chebowski
patent: 4211956 (1980-07-01), Bloyd
"Dual Input Pilot Lamp" Product Data Sheet 1800T Jul. 1975-Allen Bradley Corp.

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