E-153 View Datasheet(PDF) - SEMITEC Corporation
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Description
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E-153 Datasheet PDF : 44 Pages
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V- characteristics
ZENAMIC has the forward-reverse symmetrical
electrical characteristics as shown in the figure 1.
The voltage-current curves show the varistor
characteristics in the range 1 A to 104A, and show
the resistance characteristics for the range under
1 A and over 104A in the figure 2.
The voltage across terminals when test current(It:
1 mA)is applied to ZENAMIC is the standard varistor
voltage(Vz), and the voltage across terminals when
a standard surge(Ip) is applied represents the
maximum suppression voltage(Vc).
400
200
0
Ϫ200
Ϫ400
Fig 1
Ϫ5 Ϫ4 Ϫ3 Ϫ2 Ϫ1 0 1 2 3 4 5
Current (A)
2,000
1,000
500
Clamping voltage
200 Varistor voltage
100
Rp
50
Test current
Surge current Rs
20
Iϭ
E
C
␣
10
510Ϫ1010Ϫ9 10Ϫ8 10Ϫ7 10Ϫ6 10Ϫ5 10Ϫ4 10Ϫ3 10Ϫ2 10Ϫ1 100 101 102 103 104
Fig 2
Current (A)
Temperature characteristics
In the small current range, ZENAMIC features
outstanding temperature characteristics. A shunt
resistance Rp of metal oxide varistor has the
temperature characteristics which is determined by
the following equation.
RpϭAeEg / 2kT
(2)
T:Absolute temperature
k : Boltzmann constant
A, Eg:constants
500
400
300
25ЊC 60ЊC 90ЊC 120ЊC
200
Test current
100
50
40
30
20
10
10Ϫ10 10Ϫ9
Fig 3
10Ϫ8
10Ϫ7
10Ϫ6
10Ϫ5
10Ϫ4
10Ϫ3 10Ϫ2
Current (A)
10Ϫ1
As shown in the figure 3, the temperature dependence
characteristics are shown clearly in the low current area.
Surge waveform
A surge waveform varies according to the sources.
An EXP waveform is used for surge testing of
ZENAMIC, while a AC half-wave is used for the
energy absorption test. The EXP waveform reaches
its peak voltage (current) at [ta] as shown in the
figure 5, and then decreases as time passes and
reaches half of the peak voltage (current) at [tb].
This type of the EXP waveform is shown as a [ta/tb]
voltage (current) waveform. For surge testing
of ZENAMIC, the 8/20 sec current waveform is
used.
100
90
50
10
0
Fig 5
Part No.
ta
tb
Time(s)
Z 10 D 221
Varistor voltage
D series
Element diameter
ZENAMIC symbol
Applications
Power lines and surge absorption units with error
display (SA series).
Line to line protection
f
DC
AC single phase
Protected
circuit
AC three phase
f
f
Protected
circuit
f
Line to line and line to ground protection
f
DC
AC single phase
Protected
circuit
Thermal
coupling
f
f
AC three phase
f
f
Protected
circuit
Thermal
coupling
f
Application notes(General)
1.A surge excess of the specified Maximum Peak
Current may cause short circuit or mechanical
damage. The following measures are recommended.
In case that ZENAMIC is used in line to ground, the
ground fault circuit interrupter shall be applied in
location A or thermally coupled fuse shall be
applied in location C.
ZENAMIC shall not be used near heat generating
device and free from direct sunlight.
ZENAMIC shall not be used near the flammable
materials.
A
Power line
Protected
B
circuit
Switching surge Semiconductor
protection
protection
Contact spark
suppression
M
Motor
Single line and telephone line surge protection
Surge protection of
signal Line
COM.
Protected
Equipment
C
1) Location of the over current protector(circuit breaker
or current fuse)shall be in the power line to the
circuit(Location A)or in series with ZENAMIC
(Location B).
2) It recommended that a fuse listed in the table be put
in location A or B.
3) In case that ZENAMIC is used in line to ground, the
ground fault circuit interrupter should be applied in
location A or thermally coupled fuse should be applied
in location C.
Part Number Z5D
Z7D
Z10D
Rating of fuse
3A max.
5A max.
7A max.
Part Number Z15D
Z21D
Rating of fuse 10A max. 15A max.
Refer to the related Safety Standards.
Surge protection of
telephone Line
Telephone
33
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