Varistors (ZNR Surge Absorber)
CK type (UL and CSA Recognized)
Varistors (ZNR Surge Absorber) with Tabs is a heavy duty
type ZNR with very unique tab terminals which bring forth
a higher reliability. These tabs are used as electrical connecting terminals
and also its mounting legs. This type of ZNR is meant for applications in
power supplies or ransient voltage surge suppressor units where large surge
current or high surge energy absorption is required.
Features
●UL and CSA recognized components
●High energy handling capability (210 to 750 joules)
●Large withstanding peak current (20 to 25 kA, 8/20 μs, 2 times)
●Common terminals for electrical connection and mounting
●RoHS compliant
Recommended applications
●Power suppliers for OA, FA, telecommunication or industrial equipment
●Power strips
●Transient voltage surge suppressor units
Related standards
Standard No.
Title
UL1449
Surge protective devices
CSA C22.2 No.269.5
Surge protective devices - Type 5 – Components
●Each type designation is not registered by Part Number.
Please contact us for further questions regarding type designation.
Note : Ask our factory for Product Specification before use.
■ As for handling precautions and minimum quantity / Packing unit please see related information.
Explanation of part numbers
A
1
2
3
4
Ｅ
Ｒ
Ｚ
Ｃ
Product code
Series
5
6
Element size
7
8
Ｃ
Ｋ
Type
Tolerance
9
10
Nominal
varistor voltage
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.
11
12
Design No.
14-Dec-20
CK type
Ratings and characteristics
●Operating temperature range : -40 to 85 ℃
●Operating temperature range : ‒40 to 125 ℃
Part No.
(UL/CSA
Rrecognized）
Type
designation
Varistor
voltage
at 1ｍＡ
ERZC32CK201W
ERZC32CK241W
ERZC32CK271W
ERZC32CK361W
ERZC32CK391W
ERZC32CK431W
ERZC32CK471W
ERZC32CK511W
ERZC32CK621W
ERZC32CK681W
ERZC32CK751W
ERZC32CK781W
ERZC32CK821W
ERZC32CK911W
ERZC32CK951W
ERZC40CK201W
ERZC40CK241W
ERZC40CK271W
ERZC40CK361W
ERZC40CK391W
ERZC40CK431W
ERZC40CK471W
ERZC40CK511W
ERZC40CK621W
ERZC40CK681W
ERZC40CK751W
ERZC40CK781W
ERZC40CK821W
ERZC40CK911W
ERZC40CK951W
32K201U
32K241U
32K271U
32K361U
32K391U
32K431U
32K471U
32K511U
32K621U
32K681U
32K751U
32K781U
32K821U
32K911U
32K951U
40K201U
40K241U
40K271U
40K361U
40K391U
40K431U
40K471U
40K511U
40K621U
40K681U
40K751U
40K781U
40K821U
40K911U
40K951U
200 (185 to 225)
240 (216 to 264)
270 (247 to 303)
360 (324 to 396)
390 (351 to 429)
430 (387 to 473)
470 (423 to 517)
510 (459 to 561)
620 (558 to 682)
680 (612 to 748)
750 (675 to 825)
780 (702 to 858)
820 (738 to 902)
910 (819 to 1001)
950 (855 to 1045)
200 (185 to 225)
240 (216 to 264)
270 (247 to 303)
360 (324 to 396)
390 (351 to 429)
430 (387 to 473)
470 (423 to 517)
510 (459 to 561)
620 (558 to 682)
680 (612 to 748)
750 (675 to 825)
780 (702 to 858)
820 (738 to 902)
910 (819 to 1001)
950 (855 to 1045)
Maximum
allowable
voltage
(Ｖ)
AC rms(Ｖ)
130
150
175
230
250
275
300
320
385
420
460
485
510
550
575
130
150
175
230
250
275
300
320
385
420
460
485
510
550
575
VXA (V)
Ip (A)
Maximum
energy
(2ms)
1 time
(J)
340
395
455
595
650
710
775
845
1025
1120
1240
1290
1355
1500
1570
340
395
455
595
650
710
775
845
1025
1120
1240
1290
1355
1500
1570
200
200
200
200
200
200
200
200
200
200
200
200
200
200
200
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
210
240
255
325
350
400
405
405
415
450
500
520
545
600
600
260
300
340
405
435
500
505
505
515
560
625
650
680
750
750
Maximum
clamping
voltage
DC (Ｖ)
170
200
225
300
320
350
385
415
505
560
615
640
670
745
765
170
200
225
300
320
350
385
415
505
560
615
640
670
745
765
Maximum
peak current
(8/20 μs)
1 time 2 times
(kA)
(kA)
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
30
30
30
30
30
30
30
30
30
30
30
30
30
30
30
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
Dimensions (not to scale)
Unit : mm
Part No.
(UL/CSA recognized)
・ZNR
・Abbreviation of Part No.
・Date code
Af
te
T
H
18
25
7
7
d 8
2 ø3.4
ERZC32CK201W
ERZC32CK241W
ERZC32CK271W
ERZC32CK361W
ERZC32CK391W
ERZC32CK431W
ERZC32CK471W
ERZC32CK511W
ERZC32CK621W
ERZC32CK681W
ERZC32CK751W
ERZC32CK781W
ERZC32CK821W
ERZC32CK911W
ERZC32CK951W
ERZC40CK201W
ERZC40CK241W
ERZC40CK271W
ERZC40CK361W
ERZC40CK391W
ERZC40CK431W
ERZC40CK471W
ERZC40CK511W
ERZC40CK621W
ERZC40CK681W
ERZC40CK751W
ERZC40CK781W
ERZC40CK821W
ERZC40CK911W
ERZC40CK951W
Type designation
D max.
32K201U
32K241U
32K271U
32K361U
32K391U
32K431U
32K471U
32K511U
32K621U
32K681U
32K751U
32K781U
32K821U
32K911U
32K951U
40K201U
40K241U
40K271U
40K361U
40K391U
40K431U
40K471U
40K511U
40K621U
40K681U
40K751U
40K781U
40K821U
40K911U
40K951U
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.
H max.
36
46
44
50
T max.
7.5
7.5
8.5
9.0
9.0
9.0
9.7
9.7
9.7
9.7
10.5
10.5
10.5
11.5
11.5
7.5
7.5
8.5
9.0
9.0
9.0
9.7
9.7
9.7
9.7
10.5
10.5
10.5
11.5
11.5
d
5.7±1.0
5.4±1.0
5.2±1.0
4.6±1.0
4.4±1.0
4.1±1.0
3.9±1.0
4.5±1.0
3.9±1.0
3.6±1.0
3.3±1.0
3.1±1.0
2.9±1.0
2.5±1.0
2.3±1.0
5.7±1.0
5.4±1.0
5.2±1.0
4.6±1.0
4.4±1.0
4.1±1.0
3.9±1.0
4.5±1.0
3.9±1.0
3.6±1.0
3.3±1.0
3.1±1.0
2.9±1.0
2.5±1.0
2.3±1.0
14-Dec-20
CK type
Typical characteristics
Voltage vs. Current
(ERZC32CK201W to ERZC32CK951W)
6000
Max.Leakage
Current
4000
ERZC32CK951W
ERZC32CK911W
ERZC32CK821W
ERZC32CK751W
ERZC32CK681W
ERZC32CK621W
2000
ERZC32CK511W
ERZC32CK471W
ERZC32CK431W
ERZC32CK391W
ERZC32CK361W
1000
Voltage（V)
ERZC32CK951W
ERZC32CK911W
ERZC32CK821W
ERZC32CK751W
ERZC32CK681W
ERZC32CK621W
ERZC32CK511W
ERZC32CK471W
ERZC32CK431W
ERZC32CK391W
ERZC32CK361W
Max.Clamping Voltage
800
ERZC32CK271W
ERZC32CK241W
ERZC32CK201W
600
400
200
100
Test current waveform
10–6 to 10–3 A: Direct current
10–1 to 104 A: 8/20 μs
ERZC32CK271W
80
ERZC32CK241W
ERZC32CK201W
60
10-6
10-5
10-4
10-3
10-2
10-1
100
101
102
103
104
105
Current（A）
(ERZC40CK201W to ERZC40CK951W)
6000
Max.Leakage
Current
4000
Max.Clamping Voltage
2000
ERZC40CK511W
ERZC40CK471W
ERZC40CK431W
ERZC40CK391W
ERZC40CK511W
ERZC40CK471W
ERZC40CK431W
ERZC40CK391W
1000
ERZC40CK361W
ERZC40CK361W
800
Voltage(V)
ERZC40CK951W
ERZC40CK911W
ERZC40CK821W
ERZC40CK751W
ERZC40CK681W
ERZC40CK621W
ERZC40CK951W
ERZC40CK911W
ERZC40CK821W
ERZC40CK751W
ERZC40CK681W
ERZC40CK621W
ERZC40CK271W
ERZC40CK241W
ERZC40CK201W
600
400
A
200
100
Test current waveform
10–6 to 10–3 A: Direct current
10–1 to 104 A: 8/20 μs
ERZC40CK271W
ERZC40CK241W
ERZC40CK201W
80
60
10-6
10-5
10-4
10-3
10-2
10-1
100
101
102
103
104
105
Current(A)
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
CK type
Application note for safety standards
● Approvals products lists in "Reference Guide to Standard Products."
● UL and VDE : Registered in "Type name", it isn’t registered in "Panasonic Part No."
● CQC : Registered in "Panasonic Part No."
● "Rated Voltages" are specified for UL recognized components in list shown below.
The AC rated voltage and maximum allowable voltage
Part No.
Maximum allowable voltage
Rated voltage (Vrms)
（UL/CSA recognized）
AC rms (Ｖ)
DC (Ｖ)
UL1449
CSA C22.2 No.269.5
ERZC32CK201W
130
170
118
118
ERZC32CK241W
150
200
136
136
ERZC32CK271W
175
225
159
159
ERZC32CK361W
230
300
209
209
ERZC32CK391W
250
320
227
227
ERZC32CK431W
275
350
250
250
ERZC32CK471W
300
385
272
272
ERZC32CK511W
320
415
291
291
ERZC32CK621W
385
505
350
350
ERZC32CK681W
420
560
381
381
ERZC32CK751W
460
615
418
418
ERZC32CK781W
485
640
440
440
ERZC32CK821W
510
670
463
463
ERZC32CK911W
550
745
500
500
ERZC32CK951W
575
765
522
522
ERZC40CK201W
130
170
118
118
ERZC40CK241W
150
200
136
136
ERZC40CK271W
175
225
159
159
ERZC40CK361W
230
300
209
209
ERZC40CK391W
250
320
227
227
ERZC40CK431W
275
350
250
250
ERZC40CK471W
300
385
272
272
ERZC40CK511W
320
415
291
291
ERZC40CK621W
385
505
350
350
ERZC40CK681W
420
560
381
381
ERZC40CK751W
460
615
418
418
ERZC40CK781W
485
640
440
440
ERZC40CK821W
510
670
463
463
ERZC40CK911W
550
745
500
500
ERZC40CK951W
575
765
522
522
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
CK type
Performance characteristics
Characteristics
Test methods/description
Standard test condition
Varistor voltage
Maximum
allowable voltage
Electrical
Specifications
Electrical measurements (initial/after tests) shall be conducted at temperature of 5 to
35 ℃, relative humidity of maximum 85 %.
The voltage betwen two terminals with the specified measuring current 1mA DC
applied is called V1 or V1mA. The measurement shall be made as fast as possible to
avoid heat affection.
The maximum sinusoidal wave voltage (rms) or the maximum DC
voltage that can be applied continuously.
The maximum voltage between two terminals with the specified
standard impulse current (8/20 μs).
Clamping voltage
Rated power
―
To meet the
specified value
The maximum power that can be applied within the specified ambient temperature.
The maximum energy within the varistor voltage change of ±10 % when one impulse of
2 ms is applied.
The maximum current within the varistor voltage change of ±10 %
２
with the standard impulse current (8/20 μs) applied two times with an interval of 5
Maximum
times minutes
peak current
The maximum current within the varistor voltage change of ±10 %
１time
with the standard impulse current (8/20 μs) applied one time.
Maximum energy
Mechanical
Robustness of
terminations
(Tensile)
Vibration
After gradually applying the load of 19.6 N (2 kgf) and keeping the
unit fixed for 10 seconds, the terminal shall be visually examined for any damage.
No remarkable
damage
After repeadly applying a single harmonic vibration (amplitude:
0.35 mm): double amplitude: 0.7 mm with 1 minute vibration frequency cycles (10 Hz
to 55 Hz to 10 Hz) to each of three
perpendicular directions for 2 hours. Thereafter, the unit shall be visually examined.
No remarkable
damage
After dipping the terminal to a depth of approximately 3 mm from
the body in a soldering bath of 230±5 ℃ for 5.0±0.5 seconds, the terminal shall be
visually examined.
Solderability
The terminal shall be dipped into a soldering bath having a
temperature of 350±10 ℃ to a point 4.0±0.8 mm from the body
of the unit and then be held there for 3.0±0.5 seconds. The change of Vc and
mechanical damage shall be examined.
The specimen shall be subjected to 125±2 ℃ for 500 hours
in a thermostatic bath without load and then stored at room
temperature and humidity for one to two hours. Thereafter, the change of Vc shall be
measured.
Resistance to
soldering heat
Dry heat/ high
temperature
storage
Approximately 95 %
of the terminals shall
be covered with new solder
uniformly.
ΔV1 mA/V1 mA ≦ ±5 %
Environmental
The specimen shall be subjected to 40±2 ℃, 90 to 95 %RH for 1000 hours without
Damp heat/humidity
load and then stored at room temperature and humidity for one to two hours.
(Steady State)
Thereafter, the change of Vc shall be measured.
ΔV1 mA/V1 mA ≦ ±5 %
The temperature cycle shown below shall be repeated five times and then stored at
room temperature and humidity for one to two hours. The change of Vc and
mechanical damage shall be examined.
Step
Temperature (℃)
1
–25±3
2
Room Temp.
3
85±2
4
Room Temp.
Temperature cycle
Period (minutes)
+3
30
..0
3 max.
+3
30
..0
3 max.
ΔV1 mA/V1 mA ≦ ±5 %
No remarkable
damage
After being continuously applied the Maximum Allowable Voltage
at 85±2 ℃ for 500 hours, the specimen shall be stored at room
temperature and humidity for one to two hours. Thereafter, the change of Vc shall be
measured.
Dry heat load/
high temperature
load
ΔV1 mA/V1 mA ≦ ±10 %
Minimum quantity / Packing unit
Product
“ZNR”
Transient/surge
absorbers
Series / Type
CK type
UL and
CSA recognized
Part number
Minimum quantity
/ Packing unit
Packing quantity in
carton
Carton (about)
L×W×H (mm)
ERZC□□CK□□□W
10
200
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
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