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Characteristic Symbol Description
D1 impulse (10/350 μs), lightning impulse current ≥ 2.5 kA / core or ≥ 5 kA / total
• Exceeds the discharge capacity of –
Discharge capacity
of an arrester (accord- C2 impulse (8/20 μs), increased impulse load ≥ 2.5 kA / core or ≥ 5 kA / total
ing to the categories • Exceeds the discharge capacity of –
of IEC 61643-21 C1 impulse (8/20 μs), impulse load ≥ 0.25 kA / core or ≥ 0.5 kA / total
(EN 61643-21)) • Exceeds the discharge capacity of
Load <
Protective effect of Test level required for the terminal device: 1 or higher
an arrester (limitation Test level required for the terminal device: 2 or higher
below the test levels
acc. to IEC 61000-4-5 Test level required for the terminal device: 3 or higher
(EN 61000-4-5)) Test level required for the terminal device: 4
Energy coordination Arrester has a decoupling impedance and is suitable for coordination with
(with another an arrester marked with
Yellow/Line arrester) Arrester suitable for coordination with an arrester with decoupling impedance
Table 7.8.2.1 SPD class symbols

use of a lightning current immunity test level
combined + overvoltage according to EN 61000-4-5
arrester
terminal
device
1

cascaded use immunity test level
of arresters lightning current overvoltage according to EN 61000-4-5

terminal
device
1

energy coordination
of Yellow/Line arresters is discharge capacity
independent of the cable length

+ specific protection of
decoupling for coordination arrester can be coordinated terminal devices according to
with another arrester ( ) with another arrester ( +) IEC 61000-4-5 (EN 61000-4-5)

Figure 7.8.2.2 Examples of the energy-coordinated use of arresters according to the Yellow/Line SPD class and structure of the Yellow/Line
SPD class symbol

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