Hybrid solid state/mechanical switch with failure protection

Details Hybrid solid state/mechanical switch with failure protection Hybrid solid state/mechanical switch with failure protection

1984-07-16

1986-10-21

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 8, 361 57, 361 93, 361104, H02H 3087

Patent

active

046189068

ABSTRACT:
A hybrid solid state/mechanical switch is provided with a pair of mechanical contacts connected in parallel with a solid state switching device. These components are operated by a control circuit to achieve arcless current interruption under normal conditions. A circuit breaking device, which can be operated by a crowbar circuit, provides failure protection for the hybrid switch if excessive leakage current is detected in the solid state switching device or current continues to flow through the switch at a preselected time following the occurrence of a turn-off command signal.

REFERENCES:
patent: 3277460 (1966-10-01), Heckman
patent: 3579036 (1971-05-01), McCoy
patent: 4025820 (1977-05-01), Penrod
patent: 4249223 (1981-02-01), Shuey et al.
patent: 4251845 (1981-02-01), Hancock
patent: 4420784 (1983-12-01), Chen et al.
patent: 4466038 (1984-08-01), Robertson

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