The insulation test should be carried out using test devices according to
DIN EN 61557-2. To carr y out a simple insulation test for the electrical system, we
recommend supplying power ‘from above’ for type-B switches. This means only the
switch needs to be switched o during the test and the measurement can take place
on the system side. Performing an insulation test when the residual current circuit-
breaker is switched on or on the side with the odd-numbered terminals can lead to
erroneous measurement values as a result of the internal adaptor. In this case, we
recommend disconnecting the switch for the duration of the test.
Important information on operating an AC-DC sensitive circuit-breaker
(DRCBO 4 B/B+) with electronic equipment
(such as frequency converters, inverters etc.)
1. -Electronic equipment and its associated EMC protective provisions, such as inte
grated or in series-connected EMC lters, as well as shielded cables, can produce
high capacitive leakage currents.
2. The maximum number of items of electronic equipment connected down-
stream of the DRCBO 4 B is based on the level of leakage currents that occur.
Excessive leakage currents may lead to undesired tripping. Relevant information
concerning the leakage currents that are produced can be requested from the
manufacturers of the electronic equipment.
3. During operation with frequency converters, long, shielded motor cables may
lead to high leakage currents when the frequency converter is switched on, re-
sulting in undesired tripping. If necessary, a sinusoidal output lter should be
connected to the output of the frequency converter (before the shielded motor
cable). Refer to the Manufacturer’s instructions.
4. When switching electrical systems with electronic equipment on and o, it is
possible that very high transient leakage currents will be produced, which will
lead to tripping should they continue for the relevant duration. The switch-on
and switch-o operations should be kept as short as possible. Quick-switching,
all-pole contactors or switches with snap-action contacts are suitable (manual
rotary switches should not be used).
5. According to the instructions, a 3-conductor EMC lter should only be connected
in series with the relevant electronic equipment. To avoid impairing the lter
eect, under no circumstances should further single-phase consumers such as
incandescent bulbs be connected on the output side of the EMC lter.
6. -As a rule, dierent clock frequencies (chopper) can be selected in the case of elec
tronic equipment. In an unfavourable case, the clock frequency may lead to a risk
of resonance in an upstream EMC lter and therefore to greatly increased leakage
currents, which then result in tripping of the DRCBO 4 B. In this case, the clock
frequency must be changed.
7. Frequency converters with an integrated EMC lter often only allow a maximum
shielded motor cable length of 5 to 10 m. Longer cable lengths lead to greatly
increased leakage currents and can render the integrated EMC lter ineective.
The manufacturer’s specications must always be observed for the frequency
All professionally installed, unaltered devices are covered by warranty for the
duration of the statutory warranty period from the day of purchase by the end user.
The guarantee does not apply to damage incurred during transport or caused by
short-circuit, overloading or improper use. Should any defects in workmanship or
material be discovered within the warranty period, the company will provide repair or
replacement free of charge. The warranty will be rendered null and void if the device
is opened without authorisation.
Stwo-pole (grey: type B only)
Sfour-pole (grey: type B only)
Installation and operating instructions
Residual current circuit-breaker with integrated
overcurrent trips of the DRCBO 4 series
These installation and operating instructions are aimed at qualied
electrical specialists. The installation of devices of this type is not ap
propriate for electrical laypersons due to the considerable potential
dangers. These installation and operating instructions must be re
tained, so that they can be referred to at a later stage. The operator of
the electrical installation must be informed about the use and function
of this protective device.
Application instructions and warnings
The following notes and warnings must be observed in order to ensure safe opera-
1. Devices with visible damage must not be installed or used.
2. Operation must only occur under normal ambient conditions free of corrosive
gases in order to preserve the correct tripping function in the long term. Corro
sive gases are chlorine, ammonia and sulphurous air, for example.
3. The user must be made aware of regular function testing using the test key T.
4. The function test with the test key is not a substitute for regular testing of the
5. Erroneous tripping due to operational leakage currents or atmospheric interfer-
ence cannot be ruled out with absolute certainty. The consequences must be con-
sidered and countermeasures taken where necessary. Transient resistant residual
current circuit-breakers as well as surge protection measures and system optimi-
sations can provide a remedy.
6. If the circuit-breaker cannot be switched on, even when the consumer network is
not connected, the device must be replaced.
7. Disposal is subject to the statutory regulations of the European Union (WEEE/
German Electrical and Electronic Equipment Act).
You will nd further information and data sheets at www.doepke.de by searching
DRCBO 4 series protective devices are residual current circuit-breakers with inte-
grated overcurrent protection. They provide protection through automatic switch-
o in electrical systems, e. g. in accordance with VDE 0100 part 410. They meet the
requirements for residual current protection and line protection in accordance with
their characteristics on the name plate. The switch-o function can be tested using a
push-button which is also accessible to laypersons. Regular testing can also increase
the life of the circuit-breaker, as the mechanism of the latch is moved when tripped in
addition to the electrical test.
Electrical connection and installation
The electrical connection must be as shown in the wiring diagram and must com-
ply with the terminal designation on the device. With type-B devices, it is preferable
for the power to be supplied to the odd-numbered terminals (simplied insulation
measurement). If the device is to be operated without using all poles, it is essential (in
order to ensure the connection is correct) to observe the position of the test circuit
as per the wiring diagram and the operating voltage range of the test circuit in ac-
cordance with the data sheet. Scrape and grease aluminium conductors immediately
before connection. The device must be installed on a mounting rail (TS 35) according
to DIN EN 60715 in distribution boards that must ensure protection against direct
contact (which may be required depending on the location of use) and protection
against environmental inuences.
Testing and functional check
A simple function test with the assistance of the test key T should be carried out after
the mains voltage and the circuit-breaker are switched on. When the key is pressed,
the DRCBO 4 must disconnect without delay. The display tripped by residual current
(I∆ > I∆n) on the right-hand side next to the toggle changes in colour from white to
blue. The colour change is reset following a restart. This test must be carried out at
least every six months where the device is used as intended and must be repeated
every working day for non-stationary systems according to the regulations. If trip-
ping does not occur, the device must be replaced immediately. The operator must be
informed of this. All additional tests are covered by the prescribed acceptance test.
Tests should be carried out according to DGUV Regulation 3 (BGV A 3) depending on
The green LED on the front of the housing of the DRCBO 4 B AC-DC sensitive circuit-
breaker indicates that the AC-DC sensitive residual current detection is active. If the
LED does not illuminate, then only tripping in the event of type A residual currents
is guaranteed. If this is the case, it should be checked rst if there is operating volt-
age of min. 50 V AC between two active conductors. If this voltage is present at the
switch and the LED does not illuminate, the residual current circuit-breaker must be
Doepke Schaltgeräte GmbH, Stellmacherstraße 11, D-26506 Norden
