Varistors (ZNR Surge Absorber)
SC type
Varistors (ZNR Surge Absorber) Type SC protects power supply facilities,
communications equipment from steep lightning surges, and it is a suitable
product to incorporate it in a serge protective device corresponding to the
Japanese Industrial Standards (JIS C 5381-1).
Features
●Very large surge withstanding capability with a compact size
●Fast response to steep impulse voltage
●Low clamping voltage for better surge protection
●No follow-on current
●RoHS compliant
Recommended applications
●Power suppliers for OA, FA, telecommunication or industrial equipment
●Traffic or railroad systems
●Surge protection of automatic control devices for power distribution line
■ As for handling precautions and minimum quantity / Packing unit please see related information.
Explanation of part numbers
1
2
3
4
5
6
7
8
E
R
Z
V
S
3
4
C
Shape
Element size
Product code
Series
9
10
Type
11
Nominal
varistor voltage
12
Design No.
Ratings and characteristics
●Operating temperature range : -40 to 85 ℃
Part No.
Varistor
voltage
at 1 mA
●Storage temperature range : ‒40 to 125 ℃
Maximum
allowable
voltage
Voltage
protection
level
ERZVS34C201
200(185 to 225)
Acrms
(V)
130
ERZVS34C241
240(216 to 264)
150
200
395
900
ERZVS34C271
270(247 to 303)
175
225
455
1000
(V)
DC
(V)
170
Maximum
clamping
voltage
V250 A
340
UP(V)
(at In)
800
ERZVS34C361
360(324 to 396)
230
300
595
1200
ERZVS34C431
430(387 to 473)
275
350
710
1500
ERZVS34C471
470(423 to 517)
300
385
775
1500
ERZVS34C511
510(459 to 561)
320
415
845
1500
ERZVS34C621
620(558 to 682)
385
505
1025
2000
ERZVS34C751
750(675 to 825)
460
615
1240
2500
ERZVS34C821
820(738 to 902)
510
670
1355
2500
ERZVS34C951
950(855 to 1045)
575
765
1570
3000
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
Nominal
discharge
current
Maximum
discharge
current
In(8/20 μS)
Imax(8/20 μS)
20kA
40kA
14-Dec-20
SC type
Typical characteristics
Voltage vs. Current (ERZVS34C201 to ERZVS34C951)
10000
Max.Leakage
Current
Max.Clamping Voltage
ERZVS34C951
ERZVS34C821
ERZVS34C751
ERZVS34C621
ERZVS34C511
ERZVS34C471
ERZVS34C431
ERZVS34C361
ERZVS34C271
ERZVS34C241
ERZVS34C201
ERZVS34C951
ERZVS34C821
ERZVS34C751
ERZVS34C621
ERZVS34C511
ERZVS34C471
Voltage (V)
1000
100
ERZVS34C431
ERZVS34C361
ERZVS34C271
ERZVS34C241
ERZVS34C201
Test current waveform
10–6 to 10–3 A: Direct current
10–1 to 105 A: 8/20 μs
10
1.E-06
1.E-05
1.E-04
1.E-03
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
Current (A)
Dimensions in mm (not to scale)
Unit : mm
T
D
Part No.
ERZVS34C201
ERZVS34C241
ERZVS34C271
ERZVS34C361
ERZVS34C431
ERZVS34C471
ERZVS34C511
ERZVS34C621
ERZVS34C751
ERZVS34C821
ERZVS34C951
ZNR
H
Part number
Date code
18
25
7
36
47
T max.
9.0
9.2
9.5
10.4
11.1
11.3
9.7
9.7
10.5
11.0
11.5
8
7
H max.
D max.
2 ø3.4
Minimum quantity / Packing unit
Product
Series / Type
Part number
“ZNR”
Transient/
surge
absorbers
SC type
ERZVS34C□□□
Minimum
Packing quantity
quantity
in carton
/ Packing unit
10
200
Carton (about)
L×W×H (mm)
320×430×65
Part No., quantity and country of origin are designated on outer packages in English.
※ Please contact local sales office about packing specifications.
Design and specifications are each subject to change without notice. Ask factory for the current technical specifications before purchase and/or use.
Should a safety concern arise regarding this product, please be sure to contact us immediately.
14-Dec-20
Safety and Legal Matters to Be Observed
Safety and Legal Matters to Be Observed
Product specifications and applications
■ Please be advised that this product and product specifications are subject to change without notice for
improvement purposes. Therefore, please request and confirm the latest delivery specifications that explain
the specifications in detail before the final design, or purchase or use of the product, regardless of the
application. In addition, do not use this product in any way that deviates from the contents of the company's
delivery specifications.
■ Unless otherwise specified in this catalog or the product specifications, this product is intended for use in
general electronic equipment (AV products, home appliances, commercial equipment, office equipment,
information and communication equipment, etc.).
When this product is used for the following special cases, the specification document suited to each application
shall be signed/sealed (with Panasonic and the user) in advance..These include applications requiring special
quality and reliability, wherein their failures or malfunctions may directly threaten human life or cause harm to
the human body (e.g.: space/aircraft equipment, transportation/traffic equipment, combustion equipment,
medical equipment, disaster prevention/crime prevention equipment, safety equipment, etc.).
Safety design and product evaluation
■ Please ensure safety through protection circuits, redundant circuits, etc., in the customer's system design so
that a defect in our company's product will not endanger human life or cause other serious damage.
■ This catalog shows the quality and performance of individual parts. The durability of parts varies depending on
the usage environment and conditions. Therefore, please ensure to evaluate and confirm the state of each part
after it has been mounted in your product in the actual operating environment before use.
If you have any doubts about the safety of this product, then please notify us immediately, and be sure to conduct
a technical review including the above protection circuits and redundant circuits at your company.
Laws / Regulations / Intellectual property
■ The transportation of dangerous goods as designated by UN numbers, UN classifications, etc., does not apply
to this product. In addition, when exporting products, product specifications, and technical information described
in this catalog, please comply with the laws and regulations of the countries to which the products are exported,
especially those concerning security export control.
■ Each model of this product complies with the RoHS Directive (Restriction of the use of hazardous substances in
electrical and electronic equipment) (2011/65/EU and (EU) 2015/863). The date of compliance with the RoHS
Directive and REACH Regulation varies depending on the product model.
Further, if you are using product models in stock and are not sure whether or not they comply with the RoHS
Directive or REACH Regulation, please contact us by selecting "Sales Inquiry" from the inquiry form.
■ During the manufacturing process of this product and any of its components and materials to be used,
Panasonic does not intentionally use ozone-depleting substances stipulated in the Montreal Protocol and
specific bromine-based flame retardants such as PBBs (Poly-Brominated Biphenyls) / PBDEs (Poly-Brominated
Diphenyl Ethers). In addition, the materials used in this product are all listed as existing chemical substances
based on the Act on the Regulation of Manufacture and Evaluation of Chemical Substances.
■ With regard to the disposal of this product, please confirm the disposal method in each country and region
where it is incorporated into your company's product and used.
■ The technical information contained in this catalog is intended to show only typical operation and application
circuit examples of this product. This catalog does not guarantee that such information does not infringe upon
the intellectual property rights of Panasonic or any third party, nor imply that the license of such rights has been
granted.
Panasonic Industry will assume no liability whatsoever if the use of our company's
products deviates from the contents of this catalog or does not comply with the
precautions. Please be advised of these restrictions.
01-Dec-23
Matters to Be Observed When Using This Product
Matters to Be Observed When Using This Product
(E / CK / SC-type)
Safety measures
An abnormal state of E-Type, CK-type, and SC-type varistors (ZNR surge absorber, hereinafter "the product" or "the surge
absorber") that results from a problem with service conditions (materials used, the surrounding environment, power
conditions, circuit conditions, etc.) may cause a fire accident, electric shock accident, burn accident, or product failure.
Matters to note when handling this product will hereinafter be described. What is described below should be checked
sufficiently before the product is used.
■ Confirming rated capabilities
Use the surge absorber within the range of its rated capabilities. Each type of surge absorber has specified rated
capabilities including a maximum allowable circuit voltage, a surge current tolerance, an energy tolerance, an impulse
lifespan (surge lifespan), average pulse power, and a service temperature. Using the surge absorber under severe
service conditions that are beyond the rated capabilities causes degraded performance of the surge absorber or
destruction of a circuit element, which may lead to smoke generation, ignition, etc.
■ Take the following measures in order to avoid an accident caused by expected phenomenon.
(1) Destruction of the surge absorber may scatter its fractured pieces around. To protect other elements from these
pieces, set product in a case or shield it with a cover.
(2) Do not place the surge absorber near combustible materials (vinyl cable, resin mold, etc.). If avoiding the vicinity
of combustible materials is difficult, protect the combustible material with an incombustible cover.
(3) Surge absorber placed between lines
When the surge absorber is placed between lines, connect a normal type current fuse in series with the surge
absorber.
* See "Current fuse" in the "Circuit design and circuit board design" section.
(4) Surge absorber placed between a line and the ground
① When the surge absorber is placed between a line and the ground, even if the surge absorber short-circuits,
ground resistance will remain in the section between the line and the ground, leaving a possibility that the
current fuse won’t blow, in which case the outer sheath resin of the surge absorber may generate smoke or
ignite due to current flow. To prevent such a case, place an earth leakage breaker in a location closer to the
power supply than the surge absorber. When not using an earth leakage breaker, use a current fuse and
temperature fuse in series with each other.
* See Table 1 in the "Circuit design and circuit board design" section.
② When the surge absorber is placed between a live part and a metal case, it may cause electric shock if the
surge absorber short-circuits. To avoid this, ground the metal case or shield it to prevent direct contact with the
metal case.
■ In case the surge absorber should short-circuit and generate smoke or ignite, immediately cut off current flow
to the surge absorber.
■ Rated voltage for UL certification, etc.
To allow the surge absorber to meet leak current requirements, etc., a maximum allowable circuit voltage and rated
voltage are specified for the surge absorber.
When applying for UL certification, etc. of a device equipped with a surge absorber, ensure the working voltage of the
device does not exceed the rated voltage of the surge absorber.
■ An unexpected sharp rise in the working voltage, an incoming excessive surge, etc., may cause the surge absorber to
generate smoke or ignite.
In such a case, fire spreading through the device should be prevented to avoid expanded damage. To achieve this,
take a multi-protection measure, such as adopting fire-resistant materials that make up the outer shell components
and structural materials.
Use environments and cleaning conditions
■ Do not use the surge absorber in an outdoor environment where the surge absorber is exposed to sunlight.
■ Do not use the surge absorber in which direct sunlight hits the surge absorber or near a heating element where the
temperature of the surge absorber would rise above its working temperature.
■ Do not use the surge absorber in a place where the surge absorber is exposed to wind or rain or a highly humid place
where steam is emitted or dew concentrates.
■ Do not use the surge absorber in a place filled with dust or salt, in an atmosphere contaminated with a corrosive gas,
etc., or in liquids such as water, oil, chemical, or organic solvents.
30-Jun-23
Matters to Be Observed When Using This Product
■ Do not wash the surge absorber with a solvent (thinner, acetone, etc.) that damages the outer sheath resin.
Response to anomalies and handling conditions
Be careful not to drop the surge absorber on the floor, etc. The product is likely to suffer mechanical or electrical damage
when dropped on the floor. Avoid using such a product.
Reliability and product life
To know the detailed specifications of individual products or specific evaluation test scores, please contact us.
Circuit design and circuit board design
Meet the following requirements. Not following the requirements can result in a shorter lifespan of the surge absorber or its
failure.
■ Choose a surge absorber whose maximum allowable circuit voltage has a margin relative to the maximum voltage range
including source voltage fluctuations.
* See Table 1 in the "Circuit design and circuit board design" section.
■ When surges are applied intermittently to the surge absorber at short intervals (when pulses of voltages are applied in a
noise simulator test, etc.), make sure that the surge power does not exceed the maximum average pulse power of the surge
absorber.
■ The product numbers of recommended surge absorbers to choose are shown in Table 1.
(1) The case of placing the surge absorber between lines
When the source voltage is expected to rise temporarily due to unbalanced single-wire loads in a three-phase three-wire
connection configuration, a short circuit between a voltage line and a neutral line, loss of the neutral line, or resonance of
a capacitive load caused by switching on/off, use a surge absorber (varistor) indicated by "*" in Table 1.
(2) The case of placing the surge absorber between a line and the ground
Line-to-ground voltage may rise with a single-wire ground fault, etc. Use a recommended surge absorber in Table 1
that is different from the surge absorber placed between lines. When the device is subjected to an insulation resistance
test (500 V DC), use a surge absorber indicated by "**" in Table 1.
According to "Electrical Appliance Technical Standards" based on the Electrical Appliance and Material Safety Act, when
using a varistor voltage which would fail the insulation performance test, the surge absorber may be removed from the
device when being subjected to the test, depending on circuit test conditions.
* See attached table 4, appendix 4, "Electrical Appliance Technical Standards" based on the Electrical Appliance and
Material Safety Act.
When conducting a withstand voltage test (1000 V AC) of the device, remove the surge absorber from the device
after getting approval from the parties concerned.
■ Current fuse
(1) Select a surge absorber and fuses to use in as shown in the following table.
Confirm that no secondary accident arises when the surge absorber in an actual circuit breaks. Selected rated currents of
current fuses shown in the following table are exemplary one and may vary depending on circuit conditions used. Confirm
the rated current by a test, etc., before using the current fuse.
Series
ERZC
20EK□□□(□)
ERZC
32EK□□□(□)
ERZV
S34C□□□
ERZC
□□CK□□□W
Current fuse
(placed between lines)
10 A max.
20 A max.
20 A max.
20 A max.
Temperature fuse
(placed between a line and the
ground)
100 to 120℃ 5A
100 to 120℃ 10A
100 to 120℃ 10A
100 to 120℃ 10A
* Use the rated voltage of the current fuse that corresponds to the circuit voltage of a circuit including the current fuse.
* Connect a temperature fuse directly to the terminal so that heat from the terminal is easily transferred to the fuse and that the
fusing element of the fuse extends along its sides.
(2) Recommended parts where fuses are connected are shown in Table 1. When a load current to a protected device is so
large as to exceed the rated current of the fuse, however, connect the fuse in a location shown in the following diagram.
Power supply
Current fuse
ZNR
Protected
device
30-Jun-23
Matters to Be Observed When Using This Product
Table 1 Application example of the product (ordinary application example)
Surge absorber placed between lines
DC
Single-phase AC
DC
Single-phase AC
Current fuse
ZNR1
L
L
Protected
device
N
Connection
Surge absorber placed between a line and the ground
N
Current fuse
Protected
device
ZNR2
Thermal
coupling
Three-phase AC
ZNR1
Temperature
fuse
Three-phase AC
Current fuse
Current fuse
ZNR3 ZNR3
ZNR3
Protected
device
ZNR3
Protected
device
ZNR4
ZNR3
Varistor voltage selection
ZNR
Power supply
voltage
[AC]
Part number
E, CK, SC-type
100 V
ZNR 1
ZNR 3
120 V
200 V
to 220 V
Temperature
fuse
Thermal
coupling
ZNR
201 to 361*
ERZC□□EK
ERZC□□CK
ERZVS34C
240 V
241 to 431*
471 to 621*
Power supply
voltage
[AC]
Part number
E, CK, SC-type
100V
to 220 V
ERZC□□EK
ERZC□□CK
ERZVS34C
ZNR 2
ZNR 4
240 V
511, 621*
471
511
821 or higher**
511
821 or higher**
* To find out about surge absorbers that can be used in an AC withstand voltage test,
please contact us.
Processing conditions
■ Do not apply vibration, impact (drop impact, etc.), or pressure strong enough to crack the outer sheath resin or absorber
body of the surge absorber.
■ When coating the surge absorber with a resin or embedding it in a resin mold, avoid using a resin that degrades the
surge absorber.
■ Do not bend the surge absorber or apply force thereto close to the insulation cover of the lead terminal.
■ Make the wire as short and straight as possible.
Mounting and storage conditions
■ Do not melt solder or the insulation material making up the surge absorber when soldering the lead terminal.
■ Do not keep the product in a high-temperature or high-humidity condition. Keep the surge absorber in a room with
a temperature of 40 ℃ or lower and a relative humidity of 75% or lower and use the surge absorber within two years of
storage.
■ Keep the surge absorber in a place where no corrosive gas atmosphere (hydrogen sulfide, sulfurous acid, chlorine,
ammonia, etc.) is present.
■ Keep the surge absorber in a place where the surge absorber is protected from direct sunlight, dew concentration, etc.
30-Jun-23