Fail-safe time delay circuit

Details Fail-safe time delay circuit Fail-safe time delay circuit

H - Electricity

01

H

348/36

H01H 47/18 (2006.01) B61L 13/00 (2006.01) B61L 29/18 (2006.01)

Patent

CA 1084616

FAIL-SAFE TIME DELAY CIRCUIT ABSTRACT OF THE DISCLOSURE A fail-safe time delay circuit comprising a detection relay for sensing the presence and absence of an input signal, a switching relay for assuming a first and a second condition in accordance with the presence and absence of the input signal, and a programmable unijunction transistor oscillating circuit, a silicon controlled rectifier gating circuit and a d. c. making circuit including a solid-state Colpitts oscillator and half-wave rectifier controlled by the second condition of the switching relay for providing a predetermined time delay period between the disappearance and the reappearance of the input signal prior to permitting the switching relay reassume its first condition.

277980

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