104AT-2 Semitec, 104AT-2 Datasheet - Page 33

• Manufacturer Part Number: 104AT-2
• Description: AT thermistor, 100KOhm
• Manufacturer: Semitec

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 10
the resistance characteristics for the range under
1 A and over 10
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).
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.
Rp Ae Eg / 2kT
As shown in the figure 3, the temperature dependence
characteristics are shown clearly in the low current area.
Fig 1
Fig 2
Fig 3
2,000
1,000
400
200
200
400
500
200
100
T:Absolute temperature
k :Boltzmann constant
A, Eg:constants
500
400
300
200
100
50
20
10
50
40
30
20
10
0
5
10
10
Varistor voltage
10
10
10
R
5
p
10
9
10
9
4
8
10
10
4
I
25 C
7
A in the figure 2.
3
8
10
E
C
10
6
2
10
60 C 90 C 120 C
7
5
10
Test current
1
10
4
6
10
0
3
10
10
1
5
Clamping voltage
2
10
10
2
1
Test current
4
Surge current
10
0
3
4
Current (A)
Current (A)
10
Current (A)
A, and show
10
(2)
1
3
4
10
10
2
5
10
2
R
3
s
10
10
4
1
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.
Part No.
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.
1) Location of the over current protector(circuit breaker
2) It recommended that a fuse listed in the table be put
3) In case that ZENAMIC is used in line to ground, the
Refer to the related Safety Standards.
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.
Fig 5
or current fuse)shall be in the power line to the
circuit(Location A)or in series with ZENAMIC
(Location B).
in location A or B.
ground fault circuit interrupter should be applied in
location A or thermally coupled fuse should be applied
in location C.
Rating of fuse
Rating of fuse
Part Number
Part Number
Power line
Z 10 D 221
100
90
50
10
0
Z15D
Z5D
ta
10A max.
3A max.
A
tb
Varistor voltage
D series
Element diameter
ZENAMIC symbol
B
C
Z21D
Z7D
15A max.
5A max.
Protected
circuit
Time( s)
Z10D
7A max.
Applications
Power lines and surge absorption units with error
display (SA series).
Surge protection of
signal Line
Surge protection of
telephone Line
Line to line protection
Line to line and line to ground protection
Single line and telephone line surge protection
DC
AC single phase
AC three phase
DC
AC single phase
AC three phase
Switching surge
protection
COM
Semiconductor
protection
Thermal
coupling
.
Thermal
coupling
f
f
f
f
f
f
f
f
f
f
Contact spark
suppression
Protected
Equipment
Telephone
Protected
circuit
Protected
circuit
Protected
circuit
Protected
circuit
M
Motor
33