Page 137 - Surge-Protection-E_0.pdf

Yellow / Line SPD Classes – Symbols
All SPDs of the Yellow / Line family for use in information technology systems are assigned to a Yellow / Line SPD class and marked with a symbol in the
technical data sheet and on their rating plates. The symbol for the Yellow / Line SPD class graphically combines three important characteristics of the SPD
and can be a single symbol or a combination of individual symbols:

Characteristics Single symbol Definition
Discharge capacity of an SPD Impulse D1 (10/350), lightning impulse current 0.5 to 2.5 kA / line
(according to the categories from IEC / EN 61643-21) A • exceeds the discharge capacity of B – D
Impulse C2 (8/20), increased impulse load 1 to 5 kA / line
B
• exceeds the discharge capacity of C – D
Impulse C1 (8/20), impulse load 0.25 to 1 kA / line
C
• exceeds the discharge capacity of D
D Load < C
Protective effect of an SPD P1 Required test level of the terminal device: 1 or higher
(limitation below the test levels P2 Required test level of the terminal device: 2 or higher
according to EN 61000-4-5)
P3 Required test level of the terminal device: 3 or higher
P4 Required test level of the terminal device: 4
Energy coordination k SPD with decoupling impedance, suitable for coordination with an SPD marked with
(with another Yellow / Line SPD)
SPD is suitable for coordination with an SPD with decoupling impedance k

Examples of energy-coordinated SPDs according to the Yellow / Line SPD class:

Use of a combined lightning current and surge arrester immunity
test level
lightning current / surge acc. to EN 61000-4-5

M

terminal
device

1

Cascaded use of SPDs immunity
test level
lightning current surge acc. to EN 61000-4-5

G O
terminal
device
1

Energy coordination of Yellow/Line SPDs
is independent from the cable length G O
discharge capacity

G O

specific protection of
SPD suitable for coordination decoupling for coordination terminal equipment
with another SPD ( ) with another SPD ( ) EN 61000-4-5

133