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3.2 Type classes surge protection devices
In accordance with IEC 61643-11, OBO SPDs (surge
protection devices) are divided into three type classes
– type type and type (classes and III). protect sensitive control-
lers, the protection level must below 1,500 A
surge voltage protection concept must take account
of all electrically conductive connections and must be
structured levels. These surge voltages occur
primarily between the phase (L) and the neutral cable
(N).2.
Lightning arrestor type and combination arrestor
type 1+2
Lightning arrestors type 1/class are used the
entry the building.
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185
Chapter The internal lightning protection system
.3. Combination arrestors,
which fulfil the type class (class and the type 2
class (class II), must also fulfil the requirements for
test pulses the pulse form 8/20 µs.2/50 and 8/20 μs.
These standards contain regulations, requirements
and tests for surge protection devices used net-
works with nominal voltages 1,000 and
nominal frequencies between and Hz. Each protection level builds on
the one before and reduces the energy content of
the surge.
Surge arrestor type 2
Surge arrestors type 2/class are used main
and sub-distributors. The surge voltages are simulated with
test impulses, typically with the pulse shape
8/20 μs. The circuit protects the and lines with varis-
tor circuits and makes the connection the line
through spark gap. Thanks this protection circuit,
transverse voltages are arrested without the residual
current device (RCD) interpreting the surge current as
a residual current and interrupting the power circuit.
Surge arrestor type 3
Type 3/class III surge arrestors are used protect
against inductive coupling and switching surges the
device power circuits. The dir-
ect lightning strike simulated with test impulses of
up 100 with the pulse shape 10/350 μs. The
protection level must below 4,000 Following
consultation with the local energy provider and ac-
cordance with the VDN Directive, use before the main
meter device also possible.
The surge voltages are simulated with hybrid test im-
pulses and with the pulse shape
1. The protection devices must be
used before residual current protective device
(RCD), would otherwise interpret the arrested
surge current residual current and interrupt the
power circuit. The connection effected paral-
lel the external lines the energy network. protect sensitive controllers, the protec-
tion level must below 1,500 V
