SIOV metal oxide varistors
Housed varistors, Fail-safe varistor, SFS14 series
Series/Type:
Date:
B72214F2**1K101
April 2011
© EPCOS AG 2011. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
Housed varistors
Fail-safe varistor, SFS14 series
B72214F2**1K101
Construction
Plastic housing protected varistor
Terminals: tinned copper wire
Housing: heat-resistant and flame-retardant to UL 94 V-0
Features
No flame or rupture under specified test conditions
(see “Reliability data”, “Overvoltage test”)
No harm to other components nearby on printed circuit board (PCB)
Approvals
UL
CSA
IEC
VDE
Applications
Consumer electronics
Power supply
Delivery mode
Bulk (standard)
General technical data
Climatic category
Operating temperature
Storage temperature
Electric strength
Insulation resistance
Response time
to IEC 60068-1
to IEC 61051
to IEC 61051
to IEC 61051
40/85/56
40 ... + 85
40 ... +125
≥
2.5
≥
100
< 25
°C
°C
kV
RMS
MΩ
ns
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 14
Housed varistors
Fail-safe varistor, SFS14 series
B72214F2**1K101
Reliability data
Test
Varistor voltage
Test methods/conditions
Requirement
The voltage between two terminals with To meet the specified
the specified measuring current applied is value
called V
V
(1 mA
DC
@ 0.2 ... 2 s).
The maximum voltage between two
terminals with the specified standard
impulse current (8/20 µs) applied.
1000 h at UCT
After having continuously applied the
maximum allowable AC voltage at UCT
±2 °C
for 1000 h, the specimen shall be
stored at room temperature and normal
humidity for 1 to 2 h.
Thereafter, the change of V
V
shall be
measured.
10 surge currents (8/20
µs),
unipolar,
|∆V/V (1 mA)|
≤10%
interval 30 s, amplitude corresponding to (measured in direction of
derating curve for 10 impulses at 20
µs.
surge current)
No visible damage
Surge current derating,
2 ms
10 surge currents (2 ms), unipolar,
|∆V/V (1 mA)|
≤10%
interval 120 s, amplitude corresponding to (measured in direction of
derating curve for 10 impulses at 2 ms
surge current)
No visible damage
Electric strength
IEC 61051-1, test 4.9.2
Metal balls method, 2500 V
RMS
, 60 s
The varistor is placed in a container
holding 1.6
±0.2
mm diameter metal balls
such that only the terminations of the
varistor are protruding.
The specified voltage shall be applied
between both terminals of the specimen
connected together and the electrode
inserted between the metal balls.
No breakdown
To meet the specified
value
|∆V/V (1 mA)|
≤10%
Clamping voltage
Endurance at upper
category temperature
Surge current derating,
8/20
µs
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 14
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