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Littelfuse iTMOV Varistor Series Manual de usuario Pagina 5

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© 2013 Littelfuse, Inc.
211
Revised: October 21, 2013
Varistor Products
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.
TMOV
®
/iTMOV
®
Series
Lead Configurations
TMOV
®
Varistor
iTMOV
®
Varistor
iTMOV
®
Varistor Application Examples
TheapplicationexamplesbelowshowhowtheindicatorleadontheiTMOV
®
canbeusedtoindicatethatthethermal
elementhasbeenopened.ThissigniesthatthecircuitisnolongerprotectedfromtransientsbytheMOV.
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
To Protected Circuit
To Protected Circuit To Protected Circuit
Line
Line
Note:MOVsarenon-polarizedpassiveelements
Application Example 1
Inthiscase,theLEDisnormallyon,andisoffwhenthe
thermalelementopens.
Application Example 2
Thiscircuitutilizesanoptocouplertoprovide
galvanicisolationsbetweentheiTMOV
®
varistor
andtheindicatingoralarmcircuitry.
Application Example 3
Thiscircuitillustratestheuseofthemonitoringleadof
theiTMOV
®
varistortoensurethatequipmentisonly
operatedwhenovervoltageprotectionpresent.Innormal
operationtheloadswitchrelaysolenoidispoweredviathe
indicatorleadoftheiTMOV
®
varistor.Intheeventofthe
thermalelementbeingactivated,therelaywillde-activate,
cuttingpowertotheprotectedcircuitandthefaultLEDwill
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
To Protected Circuit
To Protected Circuit To Protected Circuit
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
To Protected Circuit
To Protected Circuit To Protected Circuit
Line
Line
Pleasenote:Indicatorcircuitsareprovidedasa
guidelineonly.Vericationofactualindicatorcircuitry
istheresponsibilityoftheenduser.Component
valuesselectedmustbeappropriateforthespecic
AClinevoltageserviceandapplication.
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