20T115E 데이터 시트보기 (PDF) - Littelfuse, Inc
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20T115E Datasheet PDF : 9 Pages
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Varistor Products
Radial Lead Varistors > TMOV® and iTMOV® Series
Lead Configurations
TMOV® Varistor
Thermal
Fuse
Element
iTMOV® Varistor
2
Thermal
Fuse
Element
3 Monitor Lead
MOV
Note: MOVs are non-polarized passive elements
3
1
2
1
Monitor Lead
MOV
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 signifies that the circuit is no longer protected from transients by the MOV.
Application Example 1
In this case, the LED is normally on, and is off when the
thermal element opens.
Line
Line Fuse
iTMOV Varistor
Neutral
LED
R
Application Example 2
This circuit utilizes an optocoupler to provide
galvanic isolations between the iTMOV® varistor
and the indicating or alarm circuitry.
Line
Line Fuse
iTMOV Varistor
Neutral
R
AC OPTOCOUPLER
TO STATUS
ANNUNCIATOR
LIGHT/ALARM
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.
Line
Line Fuse
iTMOV Varistor
Neutral
Load Switch Relay
(loss of protection)
"Load Powered"
neon lamp
Fault LED
(Normallyoff)
R
Please note: Indicator circuits are provided as a
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® and i TMOV® Varistor Series
Revision: June 10, 2010
©2010 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/tmov.html for current information.
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