4

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

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

(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

(measured in direction

of surge current)

No visible damage

Overvoltage test

The varistor should be subjected to

until it failed, in series with 5 A fuse and

5

Ω resistor (based on S14 series).

No flame, no rupture

Fail-safe varistor, SFS14 series

Housed varistors