Varistors (ZNR Surge Absorber)
E type
Varistors (ZNR Surge Absorber) Type E is capable of handling larger surge
energy than Type D in applications to protect electronic equipment or
semiconductor devices from switching and induced lightning surges.
Features
●UL and CSA recognized components
●Very large surge withstanding capability with a compact size
●Direct mounting on boards like a power distribution board available
●Fast response to steep impulse voltage
●Low clamping voltage for better surge protection
●RoHS compliant
Recommended applications
●Transistor, diode, IC, thyristor or triac semiconductor protection
●Surge protection in industrial power plant operations
●Relay or electromagnetic valve surge absorption
●Surge absorption applications in broadcasting, communications devices, traffic/railroad,
agricultural facilities, waterworks
●Surge protection of automatic control devices for power distribution line
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.
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
1
2
3
4
Ｅ
Ｒ
Ｚ
Ｃ
Product code
5
6
7
8
E
Ｋ
Type
Tolerance
Element size
9
10
11
Nominal varistor voltage
12
Design No.
―
General
Y
UL/CSA Recognized
Dimensions in mm (not to scale)
ISO
M4
4.3
24
Unit : mm
L
W
W
H
L
ERZC20EK□□□(Y)
48±1
42±1
39±1
ERZC32EK□□□(Y)
60±1
55±1
51±1
5
12
Part No.
H
ZNR
Part No.
Date code
14
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
E type / 20, 32 series (UL and CSA Recognized)
Ratings and characteristics (20 series)
●Operating temperature range : ‒40 to 85 ℃
Part No.
（UL/CSA
Recognized）
Type
designation
Varistor
voltage
at 1 mA
●Storage temperature range : ‒40 to 110 ℃
Maximum
allowable
voltage
Maximum
peak
current
Maximum
clamping
voltage
at 100 A
Maximum
energy
1 time
1 time
(2ms)
(8/20μs)
Rated
voltage
(UL/CSA)
(Ｖ)
Acrms
(Ｖ)
DC
(Ｖ)
(V)
(J)
（A）
ACrms (Ｖ)
200 (185 to 225)
130
170
340
80
8000
118
ERZC20EK201Y
20EK201U
ERZC20EK241Y
20EK241U
240 (216 to 264)
150
200
395
95
8000
136
ERZC20EK271Y
20EK271U
270 (247 to 303)
175
225
455
100
8000
159
ERZC20EK361Y
20EK361U
360 (324 to 396)
230
300
595
120
8000
209
ERZC20EK391Y
20EK391U
390 (351 to 429)
250
320
650
130
8000
227
ERZC20EK431Y
20EK431U
430 (387 to 473)
275
350
710
140
8000
250
ERZC20EK471Y
20EK471U
470 (423 to 517)
300
385
775
150
8000
272
ERZC20EK511Y
20EK511U
510 (459 to 561)
320
415
845
150
8000
291
ERZC20EK621Y
20EK621U
620 (558 to 682)
385
505
1025
160
8000
350
ERZC20EK681Y
20EK681U
680 (612 to 748)
420
560
1120
175
8000
381
ERZC20EK751Y
20EK751U
750 (675 to 825)
460
615
1240
190
8000
418
ERZC20EK781Y
20EK781U
780 (702 to 858)
485
640
1290
200
8000
440
ERZC20EK821Y
20EK821U
820 (738 to 902)
510
670
1355
215
8000
463
ERZC20EK911Y
20EK911U
910 (819 to 1001)
550
745
1500
240
8000
500
ERZC20EK102Y
20EK102U
1000 (900 to 1100)
625
825
1650
245
8000
568
ERZC20EK112Y
20EK112U
1100 (990 to 1210)
680
895
1815
250
8000
600
Ratings and characteristics (32 series)
●Operating temperature range : ‒40 to 85 ℃
Part No.
（UL/CSA
Recognized）
Type
designation
Varistor
voltage
at 1 mA
●Storage temperature range : ‒40 to 110 ℃
Maximum
allowable
voltage
Maximum
peak
current
Maximum
clamping
voltage
at 200 A
Maximum
energy
1 time
1 time
(2ms)
(8/20μs)
Rated
voltage
(UL/CSA)
(Ｖ)
Acrms
(Ｖ)
DC
(Ｖ)
(V)
(J)
（A）
ACrms (Ｖ)
ERZC32EK201Y
32EK201U
200 (185 to 225)
130
170
340
210
25000
118
ERZC32EK241Y
32EK241U
240 (216 to 264)
150
200
395
240
25000
136
ERZC32EK271Y
32EK271U
270 (247 to 303)
175
225
455
255
25000
159
ERZC32EK361Y
32EK361U
360 (324 to 396)
230
300
595
325
25000
209
ERZC32EK391Y
32EK391U
390 (351 to 429)
250
320
650
350
25000
227
ERZC32EK431Y
32EK431U
430 (387 to 473)
275
350
710
400
25000
250
ERZC32EK471Y
32EK471U
470 (423 to 517)
300
385
775
405
25000
272
ERZC32EK511Y
32EK511U
510 (459 to 561)
320
415
845
405
25000
291
ERZC32EK621Y
32EK621U
620 (558 to 682)
385
505
1025
415
25000
350
ERZC32EK681Y
32EK681U
680 (612 to 748)
420
560
1120
450
25000
381
ERZC32EK751Y
32EK751U
750 (675 to 825)
460
615
1240
500
25000
418
ERZC32EK781Y
32EK781U
780 (702 to 858)
485
640
1290
520
25000
440
ERZC32EK821Y
32EK821U
820 (738 to 902)
510
670
1355
545
25000
463
ERZC32EK911Y
32EK911U
910 (819 to 1001)
550
745
1500
600
25000
500
ERZC32EK102Y
32EK102U
1000 (900 to 1100)
625
825
1650
620
25000
568
ERZC32EK112Y
32EK112U
1100 (990 to 1210)
680
895
1815
640
25000
600
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
E type / 20, 32 series
Ratings and characteristics (20 series)
●Storage temperature range : ‒40 to 110 ℃
●Operating temperature range : ‒40 to 85 ℃
Part No.
Varistor
voltage
at 1 mA
Maximum
allowable
voltage
Maximum
clamping
voltage
at 100 A
Rated
power
Maximum
energy
(2ms)
Maximum
peak current
(8/20 μs)
1 time
2 times
Typical
capacitance
(Reference)
at 1 kHz
(Ｖ)
Acrms
(Ｖ)
DC
(Ｖ)
(V)
(W)
(J)
（A）
（A）
(pF)
ERZC20EK201
200 (185 to 225)
130
170
340
0.8
80
8000
5000
2300
ERZC20EK241
240 (216 to 264)
150
200
395
0.8
95
8000
5000
1500
ERZC20EK271
270 (247 to 303)
175
225
455
0.8
100
8000
5000
1400
ERZC20EK361
360 (324 to 396)
230
300
595
0.8
120
8000
5000
1300
ERZC20EK391
390 (351 to 429)
250
320
650
0.8
130
8000
5000
1200
ERZC20EK431
430 (387 to 473)
275
350
710
0.8
140
8000
5000
1000
ERZC20EK471
470 (423 to 517)
300
385
775
0.8
150
8000
5000
950
ERZC20EK511
510 (459 to 561)
320
415
845
0.8
150
8000
5000
930
ERZC20EK621
620 (558 to 682)
385
505
1025
0.8
160
8000
5000
900
ERZC20EK681
680 (612 to 748)
420
560
1120
0.8
175
8000
5000
850
ERZC20EK751
750 (675 to 825)
460
615
1240
0.8
190
8000
5000
800
ERZC20EK781
780 (702 to 858)
485
640
1290
0.8
200
8000
5000
800
ERZC20EK821
820 (738 to 902)
510
670
1355
0.8
215
8000
5000
700
ERZC20EK911
910 (819 to 1001)
550
745
1500
0.8
240
8000
5000
700
ERZC20EK102
1000 (900 to 1100)
625
825
1650
0.8
245
8000
5000
400
ERZC20EK112
1100 (990 to 1210)
680
895
1815
0.8
250
8000
5000
350
Ratings and characteristics (32 series)
●Operating temperature range : ‒40 to 85 ℃
Part No.
Varistor
voltage
at 1 mA
●Storage temperature range : ‒40 to 110 ℃
Maximum
allowable
voltage
Maximum
clamping
voltage
at 200 A
Rated
power
Maximum
energy
(2ms)
Maximum
peak current
(8/20 μs)
1 time
2 times
Typical
capacitance
(Reference)
at 1 kHz
(Ｖ)
Acrms
(Ｖ)
DC
(Ｖ)
(V)
(W)
(J)
（A）
（A）
(pF)
200 (185 to 225)
130
170
340
1.2
210
25000
20000
5500
ERZC32EK241
240 (216 to 264)
150
200
395
1.2
240
25000
20000
5000
ERZC32EK271
270 (247 to 303)
175
225
455
1.2
255
25000
20000
4200
ERZC32EK361
360 (324 to 396)
230
300
595
1.2
325
25000
20000
3500
ERZC32EK391
390 (351 to 429)
250
320
650
1.2
350
25000
20000
3000
ERZC32EK431
430 (387 to 473)
275
350
710
1.2
400
25000
20000
2500
ERZC32EK471
470 (423 to 517)
300
385
775
1.2
405
25000
20000
2500
ERZC32EK511
510 (459 to 561)
320
415
845
1.2
405
25000
20000
2400
ERZC32EK621
620 (558 to 682)
385
505
1025
1.2
415
25000
20000
2200
ERZC32EK681
680 (612 to 748)
420
560
1120
1.2
450
25000
20000
2100
ERZC32EK751
750 (675 to 825)
460
615
1240
1.2
500
25000
20000
2000
ERZC32EK201
ERZC32EK781
780 (702 to 858)
485
640
1290
1.2
520
25000
20000
1900
ERZC32EK821
820 (738 to 902)
510
670
1355
1.2
545
25000
20000
1800
ERZC32EK911
910 (819 to 1001)
550
745
1500
1.2
600
25000
20000
1700
ERZC32EK102
1000 (900 to 1100)
625
825
1650
1.2
620
25000
20000
1000
ERZC32EK112
1100 (990 to 1210)
680
895
1815
1.2
640
25000
20000
800
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
E type / 20 series
Typical characteristics
Voltage vs. Current
(ERZC20EK201(Y) to ERZC20EK511(Y))
Max.Leakage
Current
2000
Max.Clamping Voltage
ERZC20EK511(Y)
ERZC20EK471(Y)
ERZC20EK391(Y)
ERZC20EK361(Y)
Voltage (V)
1000
900
800
700
600
500
ERZC20EK271(Y)
ERZC20EK241(Y)
ERZC20EK201(Y)
400
300
200
100
90
80
70
60
50
Test current waveform
10–6 to 10–3 A: Direct current
10–1 to 104 A: 8/20 μs
40
30
10-6
10-5
10-4
10-3
10-2
10-1
100
Current (A)
101
102
103
104
105
(ERZC20EK621(Y) to ERZC20EK112(Y))
Max.Leakage
Current
4000
Max.Clamping Voltage
ERZC20EK112(Y)
ERZC20EK102(Y)
ERZC20EK911(Y)
ERZC20EK821(Y)
ERZC20EK781(Y)
ERZC20EK751(Y)
ERZC20EK681(Y)
ERZC20EK621(Y)
3000
Voltage (V)
2000
1000
900
800
700
600
500
400
Test current waveform
10–6 to 10–3 A: Direct current
10–1 to 104 A: 8/20 μs
300
200
10-6
10-5
10-4
10-3
10-2
10-1
100
101
102
103
104
105
Current (A)
Impulse derating curve (Relation be tween impulse width and surge, repetitively)
(ERZC20EK201(Y) to ERZC20EK271(Y))
2 times：5 min. interval
up to 10 times：2 min. interval
up to 106 times : 10 sec. interval
10000
8000
6000
4000
(ERZC20EK361(Y) to ERZC20EK681(Y))
10000
8000
6000
4000
2 times：5 min. interval
up to 10 times：2 min. interval
up to 106 times : 10 sec. interval
2000
2000
1000
800
600
1000
800
600
400
1000
800
600
400
400
200
100
80
60
40
Impulse Current（A)
2000
Impulse Current（A)
Impulse Current（A)
10000
8000
6000
4000
200
100
80
60
40
100
80
60
40
20
20
10
8
6
4
10
8
6
4
10
8
6
4
2
2
2
1
100
1000
Impulse Width（μs）
10000
20
100
1000
10000
2 times：5 min. interval
up to 10 times：2 min. interval
up to 106 times : 10 sec. interval
200
20
1
20
(ERZC20EK751(Y) to ERZC20EK112(Y))
1
20
Impulse Width（μs）
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.
100
1000
10000
Impulse Width（μs）
14-Dec-20
E type / 32 series
Typical characteristics
Voltage vs. Current
(ERZC32EK201(Y) to ERZC32EK511(Y))
2000
Max.Leakage
Current
Max.Clamping Voltage
ERZC32EK511(Y)
ERZC32EK471(Y)
ERZC32EK431(Y)
ERZC32EK391(Y)
ERZC32EK361(Y)
Voltage (V)
1000
900
800
700
600
500
ERZC32EK271(Y)
ERZC32EK241(Y)
ERZC32EK201(Y)
400
300
200
100
90
80
70
60
50
Test current waveform
10–6 to 10–3 A: Direct current
10–1 to 104 A: 8/20 μs
40
30
10-6
10-5
10-4
10-3
10-2
10-1
100
101
102
103
104
105
Current (A)
(ERZC32EK621(Y) to ERZC32EK112(Y))
4000
Max.Leakage
Current
ERZC32EK112(Y)
Max.Clamping Voltage
ERZC32EK102(Y)
ERZC32EK911(Y)
ERZC32EK821(Y)
3000
ERZC32EK781(Y)
ERZC32EK751(Y)
ERZC32EK681(Y)
ERZC32EK621(Y)
2000
Voltage (V)
1000
900
800
700
600
500
Test current waveform
10–6 to 10–3 A: Direct current
10–1 to 104 A: 8/20 μs
400
300
200
10-6
10-5
10-4
10-3
10-2
10-1
101
100
102
103
104
105
Current（A)
Impulse derating curve (Relation be tween impulse width and surge, repetitively)
(ERZC32EK201(Y) to ERZC32EK271(Y))
20000
20000
2 times：5 min. interval
up to 10 times：2 min. interval
up to 106 times : 10 sec. interval
10000
8000
6000
(ERZC32EK751(Y) to ERZC32EK112(Y))
2 times：5 min. interval
20000
up to 10 times：2 min. interval
up to 106 times : 10 sec. interval
10000
8000
6000
4000
2000
2000
2000
1000
800
600
1000
800
600
1000
800
600
200
100
80
60
40
4000
Impulse Current（A)
400
400
200
100
80
60
40
400
200
100
80
60
40
20
20
20
10
8
6
4
10
8
6
4
10
8
6
4
2
20
100
1000
Impulse Width（μs）
10000
2
2 times：5 min. interval
up to 10 times：2 min. interval
up to 106 times : 10 sec. interval
10000
8000
6000
4000
Impulse Current（A)
Impulse Current（A)
(ERZC32EK361(Y) to ERZC32EK681(Y))
20
100
1000
10000
2
20
Impulse Width（μs）
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.
100
1000
10000
Impulse Width（μs）
14-Dec-20
E type
Performance characteristics
Characteristics
Test methods / Description
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 CmA DC applied
is called VC or VCmA. 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).
Standard test
condition
Varistor voltage
Maximum
allowable voltage
Clamping voltage
Rated power
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 %
２times with the standard impulse current (8/20 μs) applied two times with an interval of 5
Maximum
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.
Temperature
Vc at 70 ℃ - Vc at 20 ℃
1
× 100(%/℃)
coefficient of varistor
×
50
Vc
at
20
℃
voltage
―
To meet the
specified value
Electrical
Maximum energy
The change of VC shall be measured after the impulse current listed below is applied
10000 times continuously with the interval of 10 seconds at room temperature.
Mechanical
Impulse life
Withstanding voltage
(Body insulation)
Robustness of
terminations
(Tensile)
Vibration
200 A (8/20 μs)
Series 32
300 A (8/20 μs)
The commercial frequency voltage of AC 2.5 kV shall be applied between terminals and
the bottom of the unit for one minute.
After gradually applying the load of 49 N (5 kgf) and keeping the
unit fixed for 10 seconds in an axial direction, the terminal shall be visually examined for
any damage.
After repeadly applying a single harmonic vibration (amplitude:
0.75 mm): double amplitude: 1.5 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 damage of the
terminals is visually examined.
The specimen shall be subjected to 110±3 ℃ 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.
Dry heat/ High
temperature
storage
Environmental
Series 20
Step
Temperature (℃）
1
-25
2
0
-3
Period (minutes)
30
Room Temp.
3
85
4
+3
..0
Room temp.
0 to ‒0.05 %/ ℃ max.
ΔV1 mA/V1 mA ≦±10%
No remarkable damage
ΔV1 mA/V1 mA ≦ ±5 %
+3
..0
3 max.
30
+3
..0
3 max.
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.
After being continuously applied the Maximum Allowable Voltage
Dry heat load/
at 85±5 ℃ for 500 hours, the specimen shall be stored at room
High temperature
temperature and humidity for one to two hours. Thereafter, the change of Vc shall be
load
measured.
The specimen shall be subjected to 40±2 ℃, 90 to 95 %RH for 1000 hours without load
Damp heat/Humidity
and then stored at room temperature and humidity for one to two hours. Thereafter, the
(Steady state)
change of Vc shall be measured.
Temperature cycle
ΔV1 mA/V 1mA ≦ ±5 %
ΔV1 mA/V1 mA ≦ ±10 %
ΔV1 mA/V1 mA ≦ ±5 %
Minimum quantity / Packing unit
Product
“ZNR”
Transient/surge
absorbers
Part number
Minimum quantity
/ Packing unit
Packing quantity
in carton
General product
ERZC□□EK□□□
5
100
UL and CSA recognized
ERZC□□EK□□□Y
5
100
Series / Type
E type
Carton (about)
L×W×H (mm)
380×405×85
380×405×85
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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