Improvements in and relating to electric fuses

Abstract

509,130. Electric cut-outs. BRITISH THOMSON-HOUSTON CO., Ltd. Jan. 14, 1939, No. 1318, Convention date, Jan. 14. 1938. [Class 38 (i)] A fusible cut-out is provided with a remotely. controlled heating device p, and two or more soldered connections, such as nand o of different melting points arranged in parallel and connected in series with the fusible conductor c so that under prolonged overloads insufficient to fuse the element c, the connection n with the lower melting point melts and allows the current to be interrupted by an auxiliary fuse k of low rating in series with the connection n. In the case of reverse current, the heater is put into operation by a relay and the connections at n and o are melted in turn. The element c is arranged between two contact plates g and f, the latter being directly connected to the terminal d. The plate g is electrically connected to the terminal e through a contact i under the control of a spring m and the auxiliary fuse k controlled by a spring m<SP>1</SP>. The heating device consists of a heating coil or of a container p containing a compound which generates heat when initially heated by a wire r. The element of the fuse k may consist of a silver wire coated with a solder of lead, tin or an alloy which delays the response of the element.

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Cited By (2)

    Publication numberPublication dateAssigneeTitle
    US-2673911-AMarch 30, 1954Driescher FritzFuse for low and high voltage current
    US-2766351-AOctober 09, 1956Chase Shawmut CoEnclosed switch and fuse units