www.vishay.com 93 RTC vishay sfernice document number: 50031 revision 28- j un-02 for technical questions, contact sfer@vishay.com features duo, trio or quarto con? gurations rheostats and potentiometers with graded winding : rts when the ration max. current exceeds 2, a graded unit may min. current enable a smaller sized unit to be used than an equivalent linear law unit for the same maximum current. graded windings can also avoid the use of twin units. linear relationships are achievable between the variable parameters being controlled and the rheostat command shaft. all rt size rheostats are available with graded windings except the rt12 size. the resistive wire is protected by a specially vishay sfernice formulated enamel. mechanical and environmental characteristics are identical to the rt series. ganged assemblies rheostats may be ganged mechanically in the following styles : 2 ganged units RTC duo 3 ganged units RTC trio 4 ganged units RTC quarto the rt12 unit is not suitable for ganged assembly. ganged assemblies may comprise : ? similar sized units, where the ohmic values may be different ; ? various sized units where the unit at the top end of the command shaft can be of smaller size. command system all units with common command : code cu shaft locking devices as an option : code dba (factory assembled). concentric shafts : code cc available for double ganged units only : RTC duo the shaft locking device and double mini switch cannot be ? tted to concentric shaft.. command knobs as an option : code jf for standard shaft, code jfp - fsp for concen tric shafts. special features for any special features such as graded windings, center- tappings, etc. we would be pleased to receive the details of your particular requirements. data required to define a unit a: ohmic value of the current load in series with the rheostat. b: supply voltage of the rheostat + series load. c: ohmic value of rheostat. d: maximum current when the rheostat is in short circuit position. e: current when the rheostat is set to maximum ohmic value. f: resistance variation law as a function of mechanical travel. to de ? ne a graded winding unit a, b and c; or c, d and e or g has to be established. application examples potentiometer mode. the following data has to be established : ? potentiometer supply voltage u. ? ohmic value of the controlled current load z. note : if the power to be controlled is small, a linear, variation law rheostat can be used. ohmic value : r = z and i = u 2 ; 5 z in such case the output current is i = 6u z control of lamps. the parameters to be established are : ? light ? ux variation required : linear from 100% to 1% log variation from 100% to 4% or from 100% to 20% ? lamp supply voltage, ? lamp power range, wirewound rheostats and potentiometers graded windings, ganged assemblies
document number: 50031 revision 28- j un-02 www.vishay.com 94 RTC vishay sfernice for technical questions, contact sfer@vishay.com concentric shaft features mechanical, electrical, and environmental features are simi- lar to the rt series document numbers, 50024, 50025, 50026, 50027, 50028, 50029, 50030 series RTC duo RTC trio RTC quarto type a 25 55 100 230 500 25 55 100 230 500 25 55 100 230 500 25 25 25 50 50 25 25 25 50 50 25 25 25 50 50 b 52 63 75 97 128 52 63 75 97 128 52 63 75 97 128 c 34.5 46 58 78 110 86.5 109 133 175 238 138.5 172 208 272 366 d 30 41 53 78 109 30 41 53 78 109 30 41 53 78 109 e ? ? ? ? ? 52 63 75 97 128 52 63 75 97 128 f 19 30 42.5 71.5 71.5 19 30 42.5 71.5 71.5 19 30 42.5 71.5 71.5 g 23 38 54.5 83 83 23 38 54.5 83 83 23 38 54.5 83 83 h 30 30 30 40 40 30 30 30 40 40 30 30 30 40 40 j 81 92 110 170 170 81 92 110 170 170 81 92 110 170 170 ? h 3.5 4.5 m5 7 7 3.5 4.5 m5 7 7 3.5 4.5 m5 7 7 dimensions series duo - trio - quarto type l m ? n 25 55 23 3.5 55 66 20 4.5 100 62 20 m5 230 110 24 7 500 110 24 7 panel cut-out series type ? p ? qr s RTC duo 25 55 100 230 500 6 6 6 10 10 3.5 3.5 3.5 5 5 20 21 21 25 25 31 38 45 45 45 concentric shaft* panel cut-out wirewound rheostats and potentiometers graded windings, ganged assemblies RTC duo 2 ganged units RTC trio 3 ganged units RTC quarto 4 ganged units ? n l m ? 12 *2 ganged units only dimensions in millimeters + connection k f g h frt trio c mrt quarto c c mrt b crt mounting plane d e 5 a 2 j p s ? q ? p r
www.vishay.com 95 RTC vishay sfernice document number: 50031 revision 28- j un-02 for technical questions, contact sfer@vishay.com marking graded winding units : rts sfernice trademark, series, style, number of graded, windings, ohmic value (in ? or k ? ), tolerance (in %), maximum current (in a), manufacturing date. ganged units : RTC : duo, trio, quarto sfernice trademark, series, style, the relative position of each unit in the assembly. crt 1st unit (command knob end), mrt 2nd and/or 3rd unit, frt last unit, ohmic value (in ? or k ? ), tolerance (in %), maximum current (in a), manufacturing date. wirewound rheostats and potentiometers graded windings, ganged assemblies electrical diagram (typical use) double potentiometer series connected, load in parallel triple rheostat series connected g z single potentiometer connected g z g z g z double rheostat parallel connected, load in series double potentiometer parallel connected, load in series triple rheostat connected, used for three phase current regulator single rheostat connected g z g z g z double bridge double potentiometer parallel connected, load in parallel triple potentiometer connected, used for three phase current regulator g z g z g z
document number: 50031 revision 28- j un-02 www.vishay.com 96 RTC vishay sfernice for technical questions, contact sfer@vishay.com 2 ganged units ordering information series RTC (e) duo method n optional cu RTC (e) trio method n optional RTC (e) quarto method n optional crt230 mrt230 mrt230 frt55 dba optional as 33 ? 220 ? 6.8k ? 1.5k ? series style special design unit sequence variation law shaft locking device spindle ohmic value tolerance 10% 10% 10% 10% crt100 mrt100 frt100 l dba optional as 33 ? 680 ? 4.7k ? 10% 10% 10% 1 common shaft cu concentric shaft cc crt25 frt25 ldba optional as 220 ? 470 ? 10% 10% jfp fsp concentric shaft knobs style special design command shaft unit sequence variation law shaft locking device spindle ohmic value tolerance options 3 ganged units 4 ganged units note unless otherwise speci ? ed the ganged units are assembled in the following sequence. the lowest ohmic value being situated on the command knob side. wirewound rheostats and potentiometers graded windings, ganged assemblies series style special design unit sequence variation law shaft locking device spindle ohmic value tolerance l
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