Varistor Products
Radial Lead Varistors > UltraMOVTM 25S Series
UltraMOVTM 25S Varistor Series
RoHS
Description
The UltraMOVTM 25S Varistor Series is designed for
applications requiring high peak surge current ratings and
high energy absorption capability. UltraMOV™ varistors are
primarily intended for use in AC Line Voltage applications
such as Surge Protective Devices (SPD), Uninterruptable
Power Supplies (UPS), AC PowerTaps, AC Power Meters,
or other products that require voltage clamping of high
transient surge currents from sources such as lightning,
inductive load switching, or capacitor bank switching.
These devices have 25mm square forms are produced
in a radial lead package and offered with straight leads.
UltraMOVs are manufactured with recognized epoxy
encapsulation and are rated for ambient temperatures
up to 85°C with no derating. This 25S Series is
Agency Approvals
Agency
Agency FIle Number
Status
LASER-branded and is supplied in bulk packaging.
E320116
Approved
Features
091788
Approved
• Lead–free and
RoHS compliant.
• Standard operating
voltage range
compatible with
common AC line
voltages (115 to
750VAC)
• High peak surge
current rating (ITM)
22kA, single 8/20μs
pulse, (25mm)
• Characterized for
maximum standby
current (Leakage)
• 40kA rating when 2
devices paralleled
(VN(DC) matched
within +/- 5%,
contact factory for
special selections
• Custom voltage
types available
• Standard lead form
and lead space options
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart
Continuous
UltraMOVTM 25S Series
Units
Steady State Applied Voltage:
AC Voltage Range (VM(AC)RMS
)
115 to 750
150 to 970
V
V
DC Voltage Range (VM(DC)
)
Transients:
Peak Pulse Current (ITM) 8x20μs Current Wave Single Pulse
22,000
230 to 890
-55 to +85
-55 to +125
<0.01
A
J
Single-Pulse Energy Capability (WTM) 2ms Current Wave
Operating AmbientTemperature Range (TA)
ºC
StorageTemperature Range (TSTG
)
ºC
Temperature Coefficient (aV) of Clamping Voltage (VC) at SpecifiedTest Current
%/C
Hi-Pot Encapsulation (COATING Isolation Voltage Capability)
Dielectic Withstand DC for 1 min per MIL–STD–202, Method 301
Insulation Resistance of the Epoxy Coating
2500
1000
V
MΩ
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only
rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is
not implied.
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ultramov25s.html for current information.
107
UltraMOV™ 25SVaristor Series
Revised: May 8, 2013