Littelfuse SMOV34S User Manual
Varistor Products
Thermally Protected Varistors > SMOV34S Series
SMOV34S Varistor Series
Agency Approvals
Agency Agency File Number
E320116
RoHS
Description
The Littelfuse SMOV thermally protected varistor is a selfprotected device. It consists of a 34mm square varistor with
an integral thermal disconnect designed to open in the event of
overheating due to abnormal overvoltage as outlined in UL1449
3rd edition. The SMOV helps facilitate SPD module compliance
to UL1449 and offers quick thermal response due to the close
proximity of the integrated thermal element to the MOV body.
This configuration also offers lower inductance than most discreet
solutions resulting in improved clamping performance to fast over
voltage transients.
The device has a separate micro-switch, which can be used to
indicate that the MOV has been disconnected from the circuit. This
separate switch makes the monitoring circuitry completely isolated
from the main power which ensures indicator circuit safety and
simplifies the customers circuit design.
Features
• Maximum single
surge capability 40 kA,
8/20 waveshape.
• Nominal Discharge
Current Value: 20kA.
• Intermediate current
rating: 50A/150A.
• -45°C to +75°C operating
temperature.
• Recognized to UL
1449 3rd edition.
• Lead-Free and RoHS
compliant.
• Integrated micro-switch
for indication
circuitry/design.
Applications
• SPD applications
• AC/DC distribution
• T/Data center
• Power supplier
• Telecommunication
Absolute Maximum Ratings
• For ratings of individual members of a series, see Device Ratings and Specifications chart
SMOV34S Series
Continous:
Steady State Applied Voltage:
DC Voltage Range (VM(DC)) 150 to 970 V
AC Voltage Range (V
Transient:
Non-Repetitive Surge Current, 8/20µs Waveform (ITM) 40,000 A
Non-Repetitive Energy Capability, 2ms Waveform (WTM) 280 to 1200 J
Operating Ambient Temperature Range (TA) -45 to +75 °C
Storage Temperature Range (T
Hi-Pot Encapsulation (Isolation Voltage Capability) 2500 V
Isolation Voltage Capability (when the thermal disconnect opens) 1500 V
Housing Insulation Resistance >1,000 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.
) -45 to +85 °C
STG
) 115 to 750 V
M(AC)RMS
Units
SMOV34S Series
© 2013 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/smov34s.html for current information.
243
Revised: May 8, 2013
HI–ENERGY MOV’S
SMOV34S Varistor Series
Varistor Products
Thermally Protected Varistors > SMOV34S Series
SMOV34S Series Ratings & Specifications
Maximum Rating (75°C) Specifications (25 °C)
Part
Number
Continuous Transient
Peak
AC
Volts
DC
Volts
Energy
2ms
Surge
Current
8/20μs
V
M (AC)
RMS
V
M(DC)
W
TM
ITM
1 × Pulse
Nominal
Discharge
Current
In
Varistor
Voltage at
1mA Test
Current
V
N(DC)
Min
V
N(DC)
Max
Maximum
Clamping
Voltage
8/20μs
Vc I
Typical
Capacitance
f = 1MHz
PK
(V) (V) (J) (A) (A) (V) (V) (A) (pF)
SMOV34S111MP
SMOV34S111NP
SMOV34S131MP
SMOV34S131NP
SMOV34S151MP
SMOV34S151NP
SMOV34S181MP
SMOV34S181NP
SMOV34S251MP
SMOV34S251NP
SMOV34S271MP
SMOV34S271NP
SMOV34S301MP
SMOV34S301NP
SMOV34S321MP
SMOV34S321NP
SMOV34S421MP
SMOV34S421NP
SMOV34S461MP
SMOV34S461NP
SMOV34S511MP
SMOV34S511NP
SMOV34S551MP
SMOV34S551NP
SMOV34S621MP
SMOV34S621NP
SMOV34S751MP
SMOV34S751NP
Average power dissipation of transients should not exceed 2.0 watts
Same ratings and specifications apply to Non Isolated Monitored Switch alternative design. Replace "M" with "N" in the part number. e.g.: SMOV34S111NP.
Refer to Part Number System at the end of this document.
115 150 280 40000 20000 163 202 305 200 11500
130 175 310 40000 20000 184 228 345 200 10000
150 200 360 40000 20000 212 268 405 200 8000
180 240 400 40000 20000 254 312 488 200 6800
250 320 490 40000 20000 354 429 650 200 5000
275 350 550 40000 20000 389 473 730 200 4500
300 385 590 40000 20000 433 528 780 200 4050
320 420 640 40000 20000 462 561 830 200 3800
420 560 910 40000 20000 610 748 1130 200 3000
460 610 960 40000 10000 642 783 1188 200 2800
510 675 960 40000 10000 735 910 1350 200 2500
550 700 965 40000 10000 770 939 1415 200 2250
62 0 80 0 1010 40000 10000 900 1100 1625 200 2100
750 970 1200 40000 10000 1080 1320 2000 200 1800
C
SMOV34S Varistor Series
244
Revised: May 8, 2013
Please refer to www.littelfuse.com/series/smov34s.html for current information.
Specifications are subject to change without notice.
© 2013 Littelfuse, Inc.
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