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Aviation History
1954
1954 - 0746.PDF
14 FLIGHT 19 MARCH 1954 n.d.h. 2653 CYCLIC SWITCH This unit is designed to switch A.C. current to a cyclic scries of 32 de-icing installations on aircraft surfaces. In response to a J second pulse of D.C. current at 24 volts from an external timing device such as an intervalometer, it breaks circuit with one installation and makes the next bank of contacts in the series. It is capable of handling power supplies of up to 4.5 kilowatts, 400 cycles, three phase A.C. at 208 volts. The A.C. contactor mechanism embodies an arrester device which gives accurate positioning of the distributor contacts. All D.C. contacts are protected by spark quenching circuits. SPECIFICATION Operating Conditions Vibration Acceleration Weight Connections Voltage Operative D.C pulse -45°C. to + 70°C. To BSS G. 100 To BSS G. 100 I3i lbs. From intervalometer—S pin climatic proof breeze plug. From A.C. supply— 4-pin climatic proof breeze plug. Operating—24 volts D.C. (nominal). Load 4.5 k.V.A. at 208 volts, 400 cycle, three phase A.C. i second. AUTOMATIC CONTROLS TEDDINGTON CONTROLS LTD., CEFN COED, MERTHYR TYDFIL, SOUTH WALES (Merthyr Tydfil 666) ciS
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