wirewound rheostats and potentiometers characteristics www.vishay.com for technical ques tions, contact: sf er@vishay.com document number: 50024 78 revision: 18-dec-06 rt vishay sfernice features ? 12 w to 500 w at 25 c ? cctu 05-03b the performance of rt-rte rheostats exceeds the requirements of specification cctu 05-03b. they have been designed for heavy duty applications such as repeated overloads, transients, shock and vibration conditions. rt vitreous series six sizes are available capable of dissipating 12, 25, 55, 100, 250 or 500 watts at 25 c. the resistive wire is protected by a proprietary vishay sfernice enamel fired at high temperature and free from any compound that could cause corrosion of the wire. the maximum operating temperature of the rt series is 320 c. ganged units ganged units are available with different combinations of power and ohmic values (see data-sheet). graded windings these are recommended when the ratio is maximum overload in rheostat use, the winding current decreases in relation to the number of turns being used. when part of the winding is used the current can be increased in accordance with the graph on the left. substantially heavier overloads can be applied in short impulses and we would be pleased to advise on this type of application, on receipt of the following information: - proposed rheostat usage - current level - operating cycles specifying duration of overload ?on?, ?off? periods. g z rheostat mode g z potentiometer mode % winding in service current increase factor over nominal 1.28 1.24 1.20 1.16 1.12 1.08 1.04 1 0 15 30 45 60 75 90 100 imax imin ------------- - 2 >
rt wirewound rheostats and potentiomaters characteristics vishay sfernice document number: 50024 for technica l questions, contact: sfer@vishay.com www.vishay.com revision: 18-dec-06 79 special features other special features are available. please consult vishay sfernice fo r all of your rheostat requirements. all the positionings are defined when the shaft end is viewed (contrary to the above windings) clockwise detent. dimensions double mini switch for series and size code l mm rt25 219410 29 rt55 219430 33 rt100 219450 33 rt230 219470 35 rt500 219480 35 c b a c b a c b a c b c idle lug idle lug c b a c b a c b a off position left code no.: 213700 off position right code no.: 213600 fixed tappings, one or more code no.: rtp not available for rt12 and rt500 idle lug left code no.: db1 not available for rt12 and rt500 idle lug right code no.: db2 not available for rt12 and rt500 reduced left travel not available for rt12 and rt500 reduced right travel not available for rt12 and rt500 double mini switch not available for rt12 l
www.vishay.com for technical ques tions, contact: sf er@vishay.com document number: 50024 80 revision: 18-dec-06 rt vishay sfernice wirewound rheostats and potentiometers characteristics power rating chart temperature rise ordering information vitreous rt 25 l as 3k3 10 % b010 e model style shaft locking device optional variation law special design method n optional winding optional command shaft il special, please supply a drawing ohmic value tolerance packing lead (pb)-free accesoires acc bouton 60jf e db1 model knob dial lead (pb)-free special features idle lug left sap part numbering guidelines rt 25 l as 3301 k b model style law ohmic value tolerance packing accrf bouton 60jf model type style ambient temperature in degrees celsius % rated power 100 75 50 25 0 0 50 100 150 200 250 300 350 rt rt e nominal dissipation in watts temperature rise at hottest point c 350 300 250 200 150 100 50 0 1 5 10 100 1000 rt 12 rt 25 rt 55 r t 100 rt 230 rt 500
document number: 91000 www.vishay.com revision: 18-jul-08 1 disclaimer legal disclaimer notice vishay all product specifications and data are subject to change without notice. vishay intertechnology, inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, ?vishay?), disclaim any and all liability fo r any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. vishay disclaims any and all li ability arising out of the use or application of any product describ ed herein or of any information provided herein to the maximum extent permit ted by law. the product specifications do not expand or otherwise modify vishay?s terms and conditions of purcha se, including but not limited to the warranty expressed therein, which apply to these products. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of vishay. the products shown herein are not designed for use in medi cal, life-saving, or life-sustaining applications unless otherwise expressly indicated. customers using or selling vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify vishay for any damages arising or resulting from such use or sale. please contact authorized vishay personnel to obtain written terms and conditions regarding products designed for such applications. product names and markings noted herein may be trademarks of their respective owners.
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