20490 and 20491 Series - Sensata
20490 and 20491 Series - Sensata
20490 and 20491 Series - Sensata
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FIXED TEMPERATURETHERMOSTATS<strong>20490</strong> <strong>and</strong> <strong>20491</strong> <strong>Series</strong>, Double Pole Automatic Reset20492 <strong>and</strong> 20493 <strong>Series</strong>, Double Pole Manual ResetAUTOMATIC RESET<strong>20490</strong> <strong>and</strong> <strong>20491</strong> <strong>Series</strong>The high capacity automaticseries are availableas limit (L) switches whichopen on temperature rise<strong>and</strong> fan (F) switches whichclose on temperature rise.MANUAL RESET20492 <strong>and</strong> 20493 <strong>Series</strong>The high contact capacityeliminates the need forcostly back-up contacts<strong>and</strong> low capacity manualreset limit controls inelectric heat applications.<strong>Sensata</strong> Technologieshas been a leadingglobal supplier ofsensors & switchesfor over 50 years.Features• Double Pole Single Throw (DPST)• Manual Reset/Trip free• Automatic Reset• Heavy Duty Capacity - up to 48 amperes per pole• Snap-Action resists shock <strong>and</strong> vibrationregardless of mounting position• Tamperproof - temperatures are factory setto customer requirements• Molded Phenolic Case - seals out lint, dust,<strong>and</strong> other contamination• Compact - easily mounted where space is limited• High ReliabilityAutomatic ResetThe Klixon <strong>20490</strong> <strong>and</strong> <strong>20491</strong> series areespecially designed for the electric heat,laundry, <strong>and</strong> other major appliance markets.The high capacity automatic series,(<strong>20490</strong> <strong>and</strong> <strong>20491</strong>) are available as limit (L)switches, which open on temperature rise,<strong>and</strong> fan (F) switches, which close ontemperature rise.The switch is enclosed within a phenolichousing <strong>and</strong> stainless steel cup assemblywhich protects the contacts from contamination.The stainless steel cup also providesa variety of mounting configurations.The switch mechanism is actuated by theKlixon snap-action bimetal disc which maybe enclosed or exposed. Enclosed disc typesshould be used in all applications whereresponse to radient heat is not critical as itprovides protection (to the bimetal element<strong>and</strong> switch assembly) against contamination<strong>and</strong> damage due to h<strong>and</strong>ling. Exposed disctypes are used in applications where a fasterthermal response to radiant heat is required.St<strong>and</strong>ardized mounting-hole dimensionsallow interchangeability with our present204 <strong>and</strong> 206 series thermostats.The <strong>20490</strong> is available with the followingterminal configurations: 0.250” X 0.032” flat,45º, <strong>and</strong> 90º male quick connect;0.187” X 0.032” 90º male quick connect;flat <strong>and</strong> 45º #8-32NC screw terminals.Only 45º #10-24 screw terminals are availableon the <strong>20491</strong>.Temperature Setting (ºF)TEMP.RANGE0 to 8081 to 200201 to 250251 to 300Electrical ClearancesTYPE<strong>20490</strong><strong>20491</strong>OPEN±6±5±6±7Manual ResetTOLERANCETHROUGH AIR1/4”3/8”CLOSE±7±7±8±10NOMINALTEMPDIFFERENCE20 to 6020 to 6020 to 6030 to 60OVER SURFACE3/8”1/2”The Klixon 20492 <strong>and</strong> 20493 series areespecially designed for the electric heat <strong>and</strong>water heater markets. The high capacityeliminates the need for costly backup contacts<strong>and</strong> low capacity manual reset limitcontrols in electric heat applications. Thecontacts are enclosed for protection fromcontamination.The 20492 <strong>and</strong> 20493 are designed for tripfree operation. The trip free constructionwill not allow the contacts to be closed untilthe temperature of the disc is lowered to itsreset point.Klixon is a registered trademark of <strong>Sensata</strong> Technologies© Copyright <strong>Sensata</strong> Technologies 2008
FIXED TEMPERATURETHERMOSTATS<strong>20490</strong> <strong>and</strong> <strong>20491</strong> <strong>Series</strong>, Double Pole Automatic Reset20492 <strong>and</strong> 20493 <strong>Series</strong>, Double Pole Manual ResetThe 20492 is available with the followingterminal configurations: 0.250” X 0.032”flat, 45º, <strong>and</strong> 90º male quick connect;0.187” X 0.032” 90º quick connect; flat<strong>and</strong> 45º #8-32NC screw terminals. Only45º #10-24 screw terminals are availableon the 20493.Temperature Setting (ºF)OPENINGTEMP. RANGE100 to 200201 to 250251 to 300Electrical ClearancesTYPE2049220493THROUGH AIR3/8”3/8”TOLERANCE±5±6±7OVER SURFACE1/2”1/2”Electrical Ratings - Auto Reset100,000 cycles/pole)<strong>20490</strong>*<strong>20491</strong>*ResistiveMotor LoadPilot DutyResistiveMotor LoadPilot Duty25 amperes at 240 VAC10 FLA-60 LRA at 120 VAC5 FLA-30 LRA at 240 VAC125 volt-amperes at 120 VAC25 amperes at 600 VAC4 FLA-8 LRA at 480 VAC690 volt-amperes at 240 VACto 480 VAC*UL Recognized component for USA <strong>and</strong> CanadaFile MP986U.S. Category MBPR2Canada Category MBPR8Electrical Ratings - Manual Reset(6,000 cycles/pole)20492*20493*ResistiveMotor LoadPilot DutyResistiveMotor LoadPilot Duty25 amperes at 600 VAC10 FLA-60 LRA at 120 VAC5 FLA-30 LRA at 240 VAC690 volt-amperes at 240/600 VAC480 volt-amperes at 120 VAC48 amperes at 600 VAC16 FLA-96 LRA at 120 VAC8 FLA-48 LRA at 240 VAC690 volt-amperes at 240/600 VAC480 volt-amperes at 120 VACA <strong>Sensata</strong> sales representative, who knows your temperaturecontrol problems <strong>and</strong> how our products solve them, is locatedclose at h<strong>and</strong>. Use his or her services to eliminate needlessengineering cost <strong>and</strong> give your products a competitive edge.(All dimensions are in inches unless otherwise noted.)<strong>20490</strong> <strong>and</strong> <strong>20491</strong>St<strong>and</strong>ard 0.250 wide X 0.032 thickspade type quick connect terminalsmate with any st<strong>and</strong>ard ampor ark-les female terminal1.1400.6040.3120.1700.050 R0.0621.5662º2.0020492 <strong>and</strong> 20493Double Pole, Single ThrowManual ResetSmall Oval FlangeTop MountingScrew Type terminals#10-24NC 2 TAP1.1400.6040.3120.1700.050 R0.06262º1.562.001.1190º0.0201.9060.03645ºDouble Pole, Single ThrowSmall Oval FlangeTop MountingQuick Connect Terminal0.8550.3811.190DIA1.501.6421.261.190DIA1.502.6420.020<strong>Sensata</strong> Technologies529 Pleasant Street, MS B19Attleboro, MA 02703-2964Phone 1-888-438-22141-508-236-1894Fax: 508-236-2349email: sensors@sensata.comwww.sensata.comImportant Notice: <strong>Sensata</strong> Technologies (<strong>Sensata</strong>)reserves the right to make changes to or discontinue anyproduct or service identified in this publication withoutnotice. <strong>Sensata</strong> advises its customers to obtain the latestversion of the relevant information to verify, before placingany orders, that the information being relied upon is current.<strong>Sensata</strong> assumes no responsibility for infringement ofpatents or rights of others based on <strong>Sensata</strong> applicationsassistance or product specifications since <strong>Sensata</strong> doesnot possess full access concerning the use or application ofcustomers’ products. <strong>Sensata</strong> also assumes no responsibilityfor customers’ product designs.Printed in U.S.A., Reprinted, February, 2008
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