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ALLIS-CHALMERS I�ISCONl\TEC'� SWIT�HES <br />can proti�ide a better operating <br />s��stem, cut maintenance costs <br />The proper selection of ;:�•_connect <br />sw�tches can mean sizeable savings <br />for you N�w Allis-Chalmers helps <br />you make th�s choice with confidence. <br />Hav�ng absorbed Schwager-Wood <br />with a�l their specialized knowledge <br />�n this field — having completed a new <br />plant to further expand production — <br />Allis-Chalmers i� ready with precise- <br />�, 'he an�wprs you need. Ready W�th <br />advice in depth, �; � sw�+-':;;� ►i t�kes <br />for your particular application, and <br />total structural substation respon�i- <br />bility whenev�r you call for it. <br />Allis-Chalmers line of HV and EHV <br />disco�r�rvct and grounding switches <br />ranging to the hi�hest rating. And <br />you'll find everything el�.� need�d to <br />complete tf�P job: oper{ating mecha- <br />nisms, bu� fittings, you n�me it ..• <br />aii thoroughly proven on ma�;ys- <br />tems throughout the countrv. <br />Allis-Chalmers offers a source of <br />supply that has shipped many thou- <br />sands of switches—as well as 500-kv <br />and 345-kv structural substations— <br />which includes 18 solid years of <br />experience in switching high voltage. <br />So when you look for answers on <br />disconnect switching, you can ex- <br />pect them to wear the Allis-Chalmers <br />trademark. <br />Now it's easier than ever for <br />you to choose precisely the right <br />switch — from 7.5 to 765 kv <br />Allis-Chalmers is ready to help you <br />pinpoint the best disconnect switch <br />for your particular application. We can <br />tell you the merits and �rawbacks of <br />Silver-inlaid copper <br />contacts is one reascn why <br />Allis-Chalmers switches <br />give years and years <br />of trouble-free service <br />BLADES <br />The blades are engineere� so that <br />motien at the base of the blades forces <br />the two pivoi points causing the blade <br />arms to extend or retract. A high <br />strength aluminum alloy was chosen <br />as the biade material on the basis of its <br />weight, durability, rigidity and conduc- <br />tivity. The blades carry load current <br />between the lower fixed terminal and <br />the upper contacts. Movable joints in <br />the biades are ail silver-to-silver. <br />CONTACT S�JRFACES <br />The finger contacts on the blades are <br />copper with �ilver inlays. The length of <br />these contacts makes allowance for <br />sag, tension and motion in the conduc- <br />tor. The upaer or stirrup contacts are <br />made of four silver-plated chromium- <br />copper bars. The four smaller diameter <br />bars are used to maximize contact sur- <br />face and to equalize contact pressure. <br />The switch mechanism at the base of <br />the blades has two copper leaf con- <br />tacts which are closed wFien the switch <br />is closed and open when the switch is <br />op�n. <br />�. <br />a given switch in any given si�`�� on. <br />And offers assistance in evaluating <br />physical clearances, �erformance, <br />weight, iength, and cost, as they relate <br />to your system. <br />For example, in many instances <br />Type-TA vertical break switches are <br />preferred because of their superior <br />ice breaking capabilities, minimum <br />phase space, and because they offer <br />the fewest moving current-transfer <br />points. On the other hand, side break <br />designs that employ cnly two in- <br />sulators tend to be favored where <br />economy and weight are primary <br />considerations. <br />Pictured here are Allis-Chalmers <br />disconnect switches that meet vir- <br />tually all systems requirements . . . <br />� <br />