Electric protective device and process of manufacturing the same

Details Electric protective device and process of manufacturing the same Electric protective device and process of manufacturing the same

1976-07-30

1977-09-13

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Fusible element actuated

200144C, 337273, 337279, H01H 8538

Patent

active

040486109

ABSTRACT:
An electric protective device capable of handling both short-circuit currents and minor overload currents of impermissible duration. The device for interrupting small overload currents of impermissible duration includes a cylinder, a plunger inside said cylinder, a spring biasing said plunger, heater means, a solder joint conductively connected to said heater means and said plunger, and a body of material evolving gases under the heat of an arc surrounding said solder joint, adjacent portions of said plunger and adjacent portions of said heater means.
The process of manufacturing this device is preferably performed in two steps, namely arranging adjacent the solder joint of the device a sleeve-shaped body of melamine and an inorganic filler in a highly viscous putty-like form, and thereafter allowing said body to harden completely.

REFERENCES:
patent: 2321711 (1943-06-01), Taylor
patent: 3810062 (1974-05-01), Kozacka
patent: 3863188 (1975-01-01), Knapp, Jr.

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