SFS14 datasheet(4/9 Pages) EPCOS

4 / 9 page

11/07

Please read Cautions and warnings and

Important notes at the end of this document.

Reliability data

Test

Test methods/conditions

Requirement

Varistor voltage

The voltage between two terminals with

the specified measuring current applied

is called Vv (1 mADC @ 0.2 … 2 s).

To meet the specified value.

Clamping voltage

The maximum voltage between two

terminals with the specified standard

impulse current (8/20

µs) applied.

To meet the specified value.

Surge current derating,

8/20

µs

CECC 42 000, test C 2.1

100 surge currents (8/20

µs), unipolar,

interval 30 s, amplitude corresponding

to derating curve for 100 impulses

at 20

µs

|∆V/V (1 mA)| ≤10%

(measured in direction

of surge current)

No visible damage

Surge current derating,

2ms

CECC 42 000, test C 2.1

100 surge currents (2 ms), unipolar,

interval 120 s, amplitude corresponding

to derating curve for 100 impulses

at 2 ms

|∆V/V (1 mA)| ≤10%

(measured in direction

of surge current)

No visible damage

Overvoltage test

The varistor should be subjected to

VRMS test (VRMS = 0.85 Vv (1 mA))

until it failed, in series with 5 A fuse and

Ω resistor (based on S14 series).

No flame, no rupture

Fail-safe varistor, SFS14 series

Housed varistors

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