© 2013 Littelfuse, Inc.
228
Revised: December 16, 2013
Varistor Products
TMOV
®
34S Varistor Series
Industrial High Energy Thermally Protected Varistors > TMOV
®
34S Series
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/tmov34s.html for current information.
R
LED
Line Fuse
TMOV34S “M”
Varistor
Neutral
Line
Figure 1. Application example 1
R
Line Fuse
Neutral
Figure 2. Application example 2
AC OPTOCOUPLER
TO STATUS
ANNUNCIATOR
LIGHT/ALARM
Line Fuse
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
TMOV34S “M”
Varistor
TMOV34S “M”
Varistor
1
2
3
3
21
Thermal
Fuse
Element
MOV
Thermal
Fuse
Element
MOV
Monitor Lead
Monitor Lead
Lead Configurations
TMOV
®
34S "E" 2-Lead Varistor
TMOV
®
34S Varistor Application Examples
The application examples below show how the monitor lead on the TMOV
®
34S
can be used to indicate that the thermal
element has been opened. This signifies that the circuit is no longer protected from transients by the MOV.
Application Example 1
Inthiscase,theLEDisnormallyon,andisoffwhenthe
thermal element opens.
Application Example 2
This circuit utilizes an optocoupler to provide
galvanic isolations between the TMOV
®
34S
varistor and the indicating or alarm circuitry.
Application Example 3
This circuit illustrates the use of the monitoring lead of
the TMOV
®
34S varistor to ensure that equipment is only
operatedwhenovervoltageprotectionpresent.Innormal
operation the load switch relay solenoid is powered via the
monitor lead of the TMOV
®
34Svaristor.Intheeventofthe
thermalelementbeingactivated,therelaywillde-activate,
cuttingpowertotheprotectedcircuitandthefaultLEDwill
illuminate.
R
LED
Line Fuse
TMOV34S “M”
Varistor
Neutral
Line
Figure 1. Application example 1
R
Line Fuse
Neutral
Figure 2. Application example 2
AC OPTOCOUPLER
TO STATUS
ANNUNCIATOR
LIGHT/ALARM
Line Fuse
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
TMOV34S “M”
Varistor
TMOV34S “M”
Varistor
R
LED
Line Fuse
TMOV34S “M”
Varistor
Neutral
Line
Figure 1. Application example 1
R
Line Fuse
Neutral
Figure 2. Application example 2
AC OPTOCOUPLER
TO STATUS
ANNUNCIATOR
LIGHT/ALARM
Line Fuse
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
TMOV34S “M”
Varistor
TMOV34S “M”
Varistor
Pleasenote:Indicatorcircuitsareprovidedasa
guideline only. Verification of actual indicator circuitry
is the responsibility of the end user. Component
values selected must be appropriate for the specific
AC line voltage service and application.
TMOV
®
34S "M" 3-Lead Varistor
Note:MOVsarenon-polarizedpassiveelements
(3 strony)
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