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 Power Taps, 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
LASER-branded and is supplied in bulk packaging.
Features
• Lead–free and
RoHS compliant.
• High peak surge
current rating (I
)
TM
22kA, single 8/20μs
pulse, (25mm)
• 40kA rating when 2
devices paralleled
(VN(DC) matched
within +/- 5%,
contact factory for
special selections
• Standard operating
voltage range
compatible with
common AC line
voltages (115 to
750VAC)
• Characterized for
maximum standby
current (Leakage)
• Custom voltage
types available
• Standard lead form
and lead space options
25S Series
™
UltraMOV
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart
ContinuousUltraMOVTM 25S SeriesUnits
Steady State Applied Voltage:
AC Voltage Range (V
DC Voltage Range (V
Transients:
Peak Pulse Current (ITM) 8x20μs Current Wave Single Pulse22,000A
Single-Pulse Energy Capability (W
Operating Ambient Temperature Range (T
Storage Temperature Range (T
Temperature Coefficient (aV) of Clamping Voltage (VC) at Specified Test Current<0.01%/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 Coating1000MΩ
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.
Marked with LF, voltage, UL/CSA Logos,
and date code
Operating/Storage
Temperature
Passive Aging
Humidity Aging
Thermal Shock
Maximum Wave 260C
-55°C to +85°C/
-55°C to +125°C
+85°C, 1000 hours
+/-10% typical voltage change
+85°C, 85% RH, 1000 hours
+/-10% typical voltage change
+85°C to -40°C 5 times
+/-10% typical voltage change
Solvent ResistanceMIL–STD–202, Method 215F
Moisture SensitivityLevel 1, J–STD–020C
UltraMOVTM 25S Series Varistors for High-Temperature Operating Conditions:
Phenolic coated devices are available with improved maximum operating temperature 125ºC.
These devices also have improved temperature cycling capability. Ratings and specifications
are per standard series except Hi–Pot Encapsulation (Isolation Voltage Capability) = 500V.
To order: add 'X1347' to part number (e.g. V25S150PX1347). These devices are NOT UL, CSA,
CECC or VDE certified.Contact factory for further details.
UltraMOV™ 25S Varistor Series
110
Revised: May 8, 2013
Please refer to www.littelfuse.com/series/ultramov25s.html for current information.
Specifications are subject to change without notice.
1. Additional optional lead form, packaging and lead spacing requirements are subject to availability and to minimum
order requirements. Please contact factory for details.
2. Nickel Barrier Wire option (Suffix 'X2855')Standard parts use Tin-Coated Copper wire. Nickel Barrier Coated Wire
is available as an option. This is Copper Wire with a flashing of Nickel, followed by a top coat of Tin. To order please
add suffix 'X2855' to end of standard part number. Contact factory for more details if required.
3. UltraMOV 25S have been qualified as type 1 application by UL1449 edition 3, which allows Permanant Connection
between the secondary of the service transformer and the line side of the service equipment overcurrent device,
as well as the load side, including watt-hour meter socket enclosures and intended to be installed without an
external overcurrent protective device.