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TMOV20RP385M Datasheet(PDF) 5 Page - Littelfuse |
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TMOV20RP385M Datasheet(HTML) 5 Page - Littelfuse |
5 / 8 page Varistor Products ©2011 Littelfuse, Inc. Revision: September 25, 2011 TMOV® and i TMOV® Varistor Series Radial Lead Varistors > TMOV® and iTMOV® Series Specifications are subject to change without notice. Please refer to www.littelfuse.com/series/tmov.html for current information. 1 2 3 3 2 1 Thermal Fuse Element MOV Thermal Fuse Element MOV Monitor Lead Monitor Lead Lead Configurations TMOV® Varistor iTMOV® Varistor iTMOV® Varistor Application Examples TheapplicationexamplesbelowshowhowtheindicatorleadontheiTMOV® canbeusedtoindicatethatthethermal elementhasbeenopened.ThissignifiesthatthecircuitisnolongerprotectedfromtransientsbytheMOV. R LED Line Fuse iTMOV Varistor Neutral Line Figure 1. Application example 1 R Line Fuse iTMOV Varistor Neutral Figure 2. Application example 2 AC OPTOCOUPLER TO STATUS ANNUNCIATOR LIGHT/ALARM Line Fuse iTMOV Varistor Neutral Figure 3. Application example 3 Fault LED (Normallyoff) "Load Powered" neon lamp Load Switch Relay (loss of protection) R Line Line Note:MOVsarenon-polarizedpassiveelements Application Example 1 Inthiscase,theLEDisnormallyon,andisoffwhenthe thermalelementopens. Application Example 2 Thiscircuitutilizesanoptocouplertoprovide galvanicisolationsbetweentheiTMOV®varistor andtheindicatingoralarmcircuitry. Application Example 3 Thiscircuitillustratestheuseofthemonitoringleadof theiTMOV®varistortoensurethatequipmentisonly operatedwhenovervoltageprotectionpresent.Innormal operationtheloadswitchrelaysolenoidispoweredviathe indicatorleadoftheiTMOV®varistor.Intheeventofthe thermalelementbeingactivated,therelaywillde-activate, cuttingpowertotheprotectedcircuitandthefaultLEDwill illuminate. R LED Line Fuse iTMOV Varistor Neutral Line Figure 1. Application example 1 R Line Fuse iTMOV Varistor Neutral Figure 2. Application example 2 AC OPTOCOUPLER TO STATUS ANNUNCIATOR LIGHT/ALARM Line Fuse iTMOV Varistor Neutral Figure 3. Application example 3 Fault LED (Normallyoff) "Load Powered" neon lamp Load Switch Relay (loss of protection) R Line Line R LED Line Fuse iTMOV Varistor Neutral Line Figure 1. Application example 1 R Line Fuse iTMOV Varistor Neutral Figure 2. Application example 2 AC OPTOCOUPLER TO STATUS ANNUNCIATOR LIGHT/ALARM Line Fuse iTMOV Varistor Neutral Figure 3. Application example 3 Fault LED (Normallyoff) "Load Powered" neon lamp Load Switch Relay (loss of protection) R Line Line Pleasenote:Indicatorcircuitsareprovidedasa guidelineonly.Verificationofactualindicatorcircuitry istheresponsibilityoftheenduser.Component valuesselectedmustbeappropriateforthespecific AClinevoltageserviceandapplication. |
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