“ZNR” Transient/Surge Absorbers (Type D)
“ZNR”Transient/Surge Absorbers, Type D, Series E
Handling Precautions
Safety Precautions
In case that a ZNR Surge Absorber (Type D Series E)(hereafter referred to as the ZNR, or product name) is
used, if an abnormality takes place because of peripheral conditions of the ZNR(material, environments, power
source conditions, circuit conditions, etc. in equipment design), fire, electric shock, burn, or product failure may be
occur. The precautions for this product are described below, understand the content thoroughly before usage. For
more questions, contact us.
1.
Precautions to be strictly observed
1.1 Confirmation of performance ratings
Use the ZNR within its rated range of performance such as the Max. allowable voltage, withstanding surge
current, withstanding energy, impulse life(surge life), average pulse power, and operating temperature range.
If used outside the range, the ZNR can be degrade and have element fracture, which may result in smoking
and ignition.
1.2 To avoid accidents due to unexpected phenomena, take the following measures
1) In the event of fracture of the ZNR, its pieces may scatter ; hence, put the case or cover of the set product in place.
2) Do not install the ZNR near combustible substances(polyvinyl chloride wires, resin moldings, etc.). If it is difficult to do,
install a nonflammable cover.
3) Across-the-line use
When the ZNR is used across a line, put a current fuse in series with the ZNR(Refer to Item 2.1.1). (4) and
Table 1.
4) Use between line to ground
(1) If the case that the ZNR is used between a line to the ground, the short-circuit of the ZNR may not blow the
current fuse because of grounding resistance, which may cause smoking and ignition of the ZNR’s exterior resin.
As the measure against it, install an earth leakage breaker on the power supply side of the ZNR position. If no
earth leakage breaker is installed, use a thermal fuse together wth a current fuse in series. (Refer to Table 1.)
(2) If the case that the ZNR is used between a live part to metal case, an electric shock may develop at a
shortcircuit of the ZNR ; hence, ground the metal case to the ground or keep it from the human body.
2. Application notes
2.1 Pay attention to the following items to avoid the shortened life and failure of the ZNR
1) Circuit conditions
(1) Select a ZNR of which the maximum voltage including fluctuations in source voltage allows for the
maximum permissible circuit voltage. (Refer to Table 1.)
(2) In cases that surges are intermittently applied at short intervals(for example, in case that the voltage of the
noise simulator test is implemented etc.), do not let them exceed the ZNR’s rated power.
(3) Select a ZNR recommended in Table 1.
<1> Across-the-line use
If possible, use a Part No. marked with ✽ in case of voltage temporarily rises load unbalance of
separately-wired loads, short between hot and neutral-line, open of neutral line in single-phase-three-wired
system, and due to resonance at switching for a capacitive, inductive load.
<2> Used between line to ground
Use a different Part No. from “Across-the-line use” as table 1, because of raising voltage in case of “Line
to Ground Fault”.
Use a Part No. marked with ✽✽ in table 1, in case of the insulation resistance test(500 VDC) for
equipment. When using a Part of the varistor voltage that the insulation efficiency examination can not
be cleared, there is a case where the surge absorber can be done by removing it from the circuit
depending on the circuit condition(Refer examination of Japan Domestic Safety Regulations).
Use a Part No. marked with ✽✽✽ in table 1, in case of the withstanding voltage test(1000 VAC or 1200 VAC)
for equipment.
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.
04
Jan. 2015
“ZNR” Transient/Surge Absorbers (Type D)
(4) Concerning current fuse
<1> We recommend selecting a ZNR and the rated current of a current fuse as follows.
Finally, please be sure that there is no danger if the ZNR mounted on the equipment breaks.
● Type
D, Series E
Standard Part No. ERZE05A□□□ ERZE07A□□□ ERZE08A□□□ ERZE10A□□□ ERZE11A□□□ ERZE14A□□□
5 A max.
Fuse rated current
7 A max.
7 A max.
10 A max.
10 A max.
10 A max.
✽ Fuses shall use rated voltages appropriate for circuits.
<2> The recommended fuse position is shown in table 1, “Example of ZNR application”, however, if the load
current of protected equipment is larger than that of the above recommended fuse rated current, install
a current fuse at the position shown below.
Current Fuse
Protected
Equipment
Power Source Side
ZNR
(5) Concerning thermal fuse
Set a thermal fuse to get high thermal conductivity with ZNR.
Table 1 Example of ZNR application
Across-the-Line use
Use between Line to ground
Connections example
DC/AC
Single-phase
L
DC/AC
Single-phase
fuse
ZNR1
L
N
Protected
Equipment
N
AC
3-phase
AC
3-phase
fuse
Example of varistor voltage
Protected
Equipment
ZNR2 {
Thermal
coupling
Thermal Fuse
ZNR3 {
ZNR3 ZNR3
Protected
Equipment
ZNR3 {
ZNR4 {
Thermal Fuse
Thermal
coupling
ZNR3
ZNR1
ZNR3
ZNR1
fuse
Protected
Equipment
ZNR
fuse
Source
voltage
Nominai varistor voltage
AC100 V
201 to 361✽
AC120 V
✽
241 to 431
AC200 V
471 to 621✽
AC220 V
✽
471 to 621
AC240 V
511, 621✽
AC380 V
751, 821✽
ZNR
ZNR2
ZNR4
Source
voltage
Nominai varistor voltage
AC100 V
AC220 V
471
511
621✽
821 and more✽✽
AC230 V
AC240 V
511
621✽
821 and more✽✽
AC380 V
112✽✽
Note : Element size is selected by impulse Condition.
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.
04
Jan. 2015
“ZNR” Transient/Surge Absorbers (Type D)
2) Operating environments
(1) The ZNR is designed to be used indoors. Do not use it exposed outdoors.
(2) Do not use the ZNR in places exposed to temperatures beyond the operating temperature range, such
as places exposed to sunlight and vicinities of heating equipment.
(3) Do not use the ZNR in places exposed to high temperatures and high humidity, such as places exposed
directly to rain, wind, dew condensation, and vapor.
(4) Do not use the ZNR in dusty and salinity environment and atmospheres polluted by corrosive gases.
3) Processing conditions
(1) Do not wash the ZNR by such solvents(thinner, acetone, etc.) as its exterior resin deteriorates.
(2) Do not apply a strong vibration or shock (by falling, etc.) to the ZNR, cracking to its exterior resin
and element may occur.
(3) When coating the ZNR with resin(including molding), do not use such resin.
(4) Do not bend the ZNR type D lead wires at the position close to its ZNR type D exterior resin, or apply
external force to the position.
(5) When soldering the ZNR lead wires, follow the recommended conditions and do not melt the solder
and insulating materials constituting the ZNR.
Soldering Method
Recommended
Condition
Attention Item
Flow soldering
260 °C, within 10 sec.
Type D is not Reflow soldering object part.
Type D
✽1 Soldering iron temperature should not exceed 400 °C and should not be applied for mor than 5 seconds.
✽2 Profile be careful because there is a margin of error in the way of measuring.
✽3 The temperature depend on the size and the package density of the substrate. Therefore, confirm every kind of the substrate.
● Soldering
temperature-time profile to recommend
Temperature (°C)
Flow soldering
Soldering
Gradual cooling
Preheating
Preheating
The normal to 130 °C
max. 120s
Soldering
max. 260 °C
max. 10s
Gradual cooling
Gradual cooling
Time
4) Long-term storage
(1)Do not store the ZNR under high temperature and high humidity. Store it at a temperature up to 40 °C
and at humidity below 75 %RH, and use it within two years.
Before using the ZNR that has been stored for a long period(two years or longer), confirm the
solderability.
(2) Avoid atmospheres full of corrosive gases(hydrogen sulfide, sulfurous acid, chlorine, ammonia, etc.).
(3) Avoid direct sunlight and dew condensation.
3. Notices
3.1 In cases that the ZNR is used in equipment(aerospace equipment, medical equipment, etc.) requiring extremely
high reliability, ask us for a selection of Part No., and protection coordination, etc. in advance.
3.2 Note that we do not take any responsibility for faults and abnormalities resulting from the use not in conformity
with the contents of entries in the delivery specification.
3.3 There is a possibility that the ZNR will unexpectedly cause smoke or ignite because of an abnormal rise of the
circuit voltage and invasion of excessive surge. To prevent that accident from spreading over the equipment and not
to expand the damage, use multiplex protection such as the adoption of frame-retardant materials for housing parts
and structural parts.
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.
04
Jan. 2015