Doepke
The experts in residual current technology
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»» Protective separation for smooth DC residual currents
and AC residual currents up to 100 kHz
»» Comprehensive, standard-compliant protection against
personal injury, fire, and damage to property and systems
»» Maximum immunity against transient current –
guarantees the highest system availability possible
»» Rated current up to 125 A in just 4 modules (installation
width) allows for easy system conversion
»» Application-specific versions can be supplied
Doepke
Ty pe B: AC- DC se n s itiv e
re sidual cu rren t p ro te c tio n
DFS 4 B, 30 mA: tripping current frequency response
10000
Residual current (mA)
SK
1000
B+
NK
100
10
10
100
Frequency (Hz)
1000
10000
100000
The per fect tr ipping response
thr ough var ious char act eri st i c curves
AC-DC sensitive protection
These days consumers and converters with operating
frequencies into the kilohertz range are standard in electro-
1
technical systems. The consideration of protective devices
Standard-compliant protection
for operating these systems has become more complex
For many applications, the use of an AC-DC sensitive
over recent years. In particular, protection against residual
RCCB is required by VDE regulations and the safety
currents must be looked at with new eyes, because con-
provisions of health and safety authorities. These
sumers and converters can also generate these currents,
regulations stipulate that type B residual current circuit
The best protection
with the DFS 4 B NK or B+
which contain both direct current and frequencies up to tens
breakers must be used in systems with operating
DFS 4 B+ residual current circuit breakers meet the
of kilohertz. Conventional type A residual current circuit
equipment that can generate smooth DC currents. The
minimum fire protection requirements. The characteristic
breakers are not suitable for these kinds of conditions and
number of devices that can generate these smooth
curve for the tripping current frequency response of these
therefore pose a risk to more than just the system operator.
DC currents is constantly increasing, and many elec-
breakers runs at frequencies up to 20 kHz and maintains
High system availability
with the DFS 4 B SK
trical installations must then be adapted accordingly.
a tripping threshold of 420 mA. Modern converters may
The SK frequency response has a tripping threshold of
A specialist in residual current protection technology,
Therefore, choosing an AC-DC sensitive RCCB is an
generate residual currents with much higher frequencies,
up to 2 A at high frequencies. If system-specific, high-
Doepke is a pioneer for AC-DC sensitive residual
investment in the future: with it you have equipped your
however, which also pose a fire hazard. In these cases
frequency leakage currents are unavoidable, the SK
current circuit breakers. For years our equipment
systems today for the requirements of tomorrow.
devices with the NK characteristic curve are recommended.
characteristic curve offers the highest possible system
Even at frequencies up to 100 kHz, these operate within
availability. Devices with this curve provide protection
has provided reliable protection against all types
of residual currents. The various types of devices
Furthermore, it goes without saying that our
a conventional upper threshold of 300 mA and therefore
against fire and direct contact burns at frequencies up to
we offer use simple solutions to meet the complex
protective devices meet the relevant national
provide increased protection against fire and direct contact
1 kHz. These devices present a solution that combines
protection requirements of a wide range of systems.
and international standards (IEC) in force.
burns. These devices meet all relevant standards.
safety and cost-effectiveness even for problematic systems.
Doepke
Choosi n g t h e ri g h t b r e a k e r
Basic circuit for electronic operating
equipment in accordance
with DIN VDE 0100 530
DFS 4 B NK
Will the breaker be
used for a plant where
fire is a potential
hazard?
Three-phase full bridge circuit
Three-phase star circuit
Full bridge circuit between external conductors
Single-phase detection with smoothing
Systems with frequency converters:
● Pumping, air conditioning and ventilation
systems
● Escalators and wheelchair systems
● Medical devices
and also
● Solar power plants
● Welding plants
● UPS systems
yes
yes
Examples:
yes
facilities
● Biogas plants
● Paint shops
● Joineries
● Refuelling systems
● Warehouses
● Agricultural
Is a fire protection
threshold of 420 mA
too high
or
are frequencies greater
than 20 kHz?
NK
meets conventional required fire protection
levels of 300 mA at frequencies
up to 100 kHz
Result: optimal system protection
B+
DFS 4 B+
no
meets required fire protection levels
of 420 mA at frequencies
of only 20,000 Hz or lower
Result: limited system protection
no
no
A
DFS 4 B SK
Use conventional
type A RCCB
SK
With a tripping threshold of 2 A at
frequencies above 2 kHz, this breaker
protects against high leakage currents.
At first glance, choosing the right
RCCB requirements by considering
but not least, provisions in force for
residual current circuit breaker seems
how your RCCB will be used and
your facility. You can always find the
a difficult decision. In actual fact only a
what criteria need to be met in order
right breaker at Doepke – if you don‘t
few easy questions need to be taken
to comply with insurance conditions,
see one in our range, we will design a
into account: you can determine your
health and safety regulations and last
breaker especially to suit your needs.
The selective series
for more control
The heavy-duty
version
Device versions with an added
Doepke has developed a HD
„S“ in the name are suitable for
(„heavy-duty“), corrosion-resistant
providing selective protection in
version of breakers for use in adverse
Schaltgeräte GmbH
systems with main and sub-distri-
conditions where corrosive gasses at
Stellmacherstraße 11
D-26506 Norden, Germany
Postfach 10 01 68
D-26491 Norden, Germany
Phone +49 4931 1806-0
Fax
+49 4931 1806-101
E-mail:info@doepke.de
www.doepke.de
bution units. A targeted layout of
significant concentration levels must
immediate conventional breakers
be taken into account.
or immediate AC-DC sensitive
In principle all Doepke residual current
breakers can be arranged, allowing
circuit breakers are available in an
for graduated system protection.
HD version as well, type A and type B.
Doepke
Art.-Nr. 5900122
V 07/2011
© Doepke Schaltgeräte GmbH Subject to technical modifications.
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