Higher current carrying capacity 250V subminiature fuse

Details Higher current carrying capacity 250V subminiature fuse Higher current carrying capacity 250V subminiature fuse

1990-04-23

1991-01-29

Broome, H.

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

337273, 29623, H01H 8516, H01H 8514, H01H 8538

Patent

active

049889699

ABSTRACT:
A subminiature fuse is disclosed comprising two terminals (20, 30), two substrates (80, 90), a fusible conductor (140), an insulating coating (180), and a unitary housing (170). The unitary housing is protected from the interrupt arc by the substrates (80, 90) and the housing (170) is sealed to provide increased mechanical strength, thus reducing the risk of a catastrophic failure of the fuse. The upper portion of the fuse terminals are shaped into finger like projections (70) adaptable to mechanically holding the fusible conductor (140) and a substrate (80), thus facilitating the manufacturing process. In one embodiment the fusible conductor and adjacent portions of the terminals and substrates are coated with a insulating coating or adhesive (180). The insulating coating (180) conducts heat away from the fusible conductor (140) during normal operation. To further protect the housing in the event of a short circuit interruption, a substrate (90) is placed between the housing and the fusible conductor. The housing is sealed by ultrasonic welding or may be an insert molded plastic enclosure which is substantially devoid of air.

REFERENCES:
patent: 4417226 (1983-11-01), Asdollahi et al.
patent: 4612529 (1986-09-01), Gurevich et al.
patent: 4751489 (1988-06-01), Spaunhorst

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