Fused electrical safety barrier for protection of an electrical

Details Fused electrical safety barrier for protection of an electrical Fused electrical safety barrier for protection of an electrical

1989-08-31

1991-05-07

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Impedance insertion

361104, 361111, H02H 504

Patent

active

050141562

ABSTRACT:
To protect an encapsulated fuse (9) within a wholly enclosed sealed safety barrier having a first voltage limiting circuit (10) and a current limiting circuit (15), an externally accessible high current interrupter (5), such as a fuse, positive temperature coefficient resistor (26) or circuit breaker (27) is connected in series with an input terminal, and further serially connected with a second voltage limiting circuit (6) connected downstream of the interrupter and across the safety barrier circuit, the second voltage limiting circuit having a voltage limiting response characteristic which is, preferably, the same as the first voltage limiting circuit within the barrier, and the interrupter having a response threshold which is at least as high, but may be higher than the fuse (9) encapsulated within the circuit. The combination of the second voltage limiting circuit (6) with the fuse (5) acts as a clamping circuit, in case of over-voltage or other malfunction, with respect to the encapsulated fuse (9) so that the externally accessible interrupting element can be replaced or reset, or will reset automatically to avoid replacement of the entire safety barrier.

REFERENCES:
patent: 4389695 (1983-06-01), Carpenter, Jr.
patent: 4520419 (1985-05-01), Locher et al.
patent: 4587588 (1986-05-01), Goldstein
patent: 4831484 (1989-05-01), Bruch
"Elektroanzeiger", 29th year, 1976, No. 24, pp. 589-591, article by Bensieck, Kaltleiter als selbstregelnde . . . Uberlastsicherungen, (Cold Conductors as Self-Regulating Heat Elements and Destruction-Free Over-Load Safety Devices).

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