Littelfuse 25S User Manual

Varistor Products

Radial Lead Varistors > UltraMOVTM 25S Series

UltraMOVTM 25S Varistor Series

Agency Approvals

Agency Agency FIle Number Status

E320116 Approved

091788 Approved

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 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

Continuous UltraMOVTM 25S Series Units
Steady State Applied Voltage:

AC Voltage Range (V

DC Voltage Range (V

Transients:

Peak Pulse Current (ITM) 8x20μs Current Wave Single Pulse 22,000 A

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 Coating 1000 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.

) -55 to +125 ºC

STG

) 115 to 750 V

M(AC)RMS

) 150 to 970 V

M(DC)

) 2ms Current Wave 230 to 890 J

) -55 to +85 ºC

A

TM

2500 V

107

Revised: May 8, 2013

UltraMOV™ 25S Varistor Series

Varistor Products

Radial Lead Varistors > UltraMOVTM 25S Series

UltraMOV™ 25S Series Ratings & Specifications

Maximum Rating (85°C) Specifications (25°C)

Part

Number

Branding

Continuous Transient

AC Volts DC Volts

V

M(AC)RMSVM(DC)

Energy

2ms

W

TM

1 x

Pulse

Peak Surge

Current

8 x 20μs

ITM

1 x Pulse

Varistor Voltage

at 1mA DC

Test Current

V

NOM

Min

V

NOM

Max

(V) (V) (J) (A) (V) (V) (pF)

V25S115P P25S115 115 150 230 22000 162 198 295 400 4500
V25S130P P25S130 130 170 255 22000 184 226 335 500 3900
V25S140P P25S140 140 180 285 22000 200 240 355 500 3500
V25S150P P25S150 150 200 300 22000 216 264 390 500 3200
V25S175P P25S175 175 225 315 22000 243 297 450 600 2550
V25S230P P25S230 230 300 400 22000 324 396 585 700 1900
V25S250P P25S250 250 320 435 22000 351 429 640 800 1750
V25S275P P25S275 275 350 470 22000 387 473 700 900 1610
V25S300P P25S300 300 385 500 22000 423 517 765 1000 1450
V25S320P P25S320 320 420 540 22000 459 561 825 1000 1350
V25S385P P25S385 385 505 630 22000 558 682 1010 1200 108 0
V25S420P P25S420 420 560 655 22000 612 748 1100 1500 1000
V25S440P P25S440 440 585 675 22000 643 787 1160 n/a 900
V25S460P P25S460 460 615 690 22000 675 825 1220 n/a 870
V25S510P P25S510 510 670 700 22000 738 902 1335 n/a 820
V25S550P P25S550 550 745 765 22000 819 1001 1475 n/a 750
V25S625P P25S625 625 825 800 22000 900 1100 1625 n/a 660
V25S750P P25S750 750 970 890 22000 1080 1320 1950 n/a 550

Note: Average powder dissipation of transients should not exceed 1.5 watts.

Maximum

Clamping

Voltage at 100A,

8 x 20μs

V

C

UL 1449 ed.3

Voltage

Protection

Rating

VPR C

Typical

Capaci-

f = 1MHz

tance

Transient V-I Characteristics Curves

Peak Current, Energy and Power Derating Curve

100

80

60

40

20

PERCE NT OF RATED V ALUE

0

Figure 1

55 50 60 70 80 90 100 110 120 130

AMBIENT T EMPERATUR E (ºC)

For applications exceeding 85ºC ambient temperature, the
peak surge current and energy ratings must be reduced as
shown above.

UltraMOV™ 25S Varistor Series

Peak Pulse Current Test Waveform for Clamping Voltage

108

Revised: May 8, 2013

100

50

PERCENT OF PEAK VALUE

0

t

t

1

t

2

Figure 2

O

1

01 = Virtual Origin of Wave
T = Time from 10% to 90% of Peak
T1 = Rise Time = 1.25 x T
T2 = Decay Time
Example - For an 8/20 μs Current Waveform:

8μs = T1 = Rise Time
20μs = T2 = Decay Time

Please refer to www.littelfuse.com/series/ultramov25s.html for current information.

Specifications are subject to change without notice.

TIME

© 2013 Littelfuse, Inc.