B722 datasheet(19/47 Pages) EPCOS

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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

Endurance at upper

category temperature

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 VV shall be

measured.

∆V/V (1 mA)| ≤10%

Surge current derating,

8/20

µs

10 surge currents (8/20

µs), unipolar,

interval 30 s, amplitude corresponding

to derating curve for 10 impulses at

µs

∆V/V (1 mA)| ≤10%

(measured in direction of

surge current)

No visible damage

Surge current derating,

2 ms

10 surge currents (2 ms), unipolar,

interval 120 s, amplitude corresponding

to derating curve for 10 impulses at

2 ms

∆V/V (1 mA)| ≤10%

(measured in direction of

surge current)

No visible damage

Electric strength

IEC 61051-1, test 4.9.2

Metal balls method, 2500 VRMS, 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

Leaded varistors

B722*

StandarD series

Page 19 of 47

Please read Cautions and warnings and

Important notes at the end of this document.

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