Solid state relay having visual contact monitor

Details Solid state relay having visual contact monitor Solid state relay having visual contact monitor

1989-04-24

1990-05-29

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340645, 340653, 340654, 324418, 361 97, 307112, 307139, G08B 2100

Patent

active

049299328

ABSTRACT:
A visual indication system for easily providing information about the status of the output terminals of a solid state relay. A two-electrode neon glow lamp is connected across the output terminals of the relay in series with a current limiting resistor. The shunting impedance of the relay output terminals prevents voltage from inducing a glow in the neon lamp in certain modes of terminal configuration. When the terminals are ON, neither electrode glows. When the terminals are OFF, both electrodes glow. If the AC relay fails in a half-wave mode, only one of the electrodes will glow.

REFERENCES:
patent: 3346855 (1967-10-01), Bishop
patent: 3696364 (1972-10-01), Lavelle
patent: 4099100 (1978-07-01), Takahata
patent: 4340852 (1982-07-01), Togneri
patent: 4479117 (1984-10-01), Marquardt

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