DFA 2-10 pages

Doepke
The experts in residual current protection technology

DATA SHEET
DFA 2-1
for DFS 2/4 residual current circuit-breakers in new design
Article No. 09100112

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Function
Automatic reclosing devices (ARDs) or remote actuators are generally used to increase system availability. Usually ange-mounted to
the side of the corresponding circuit-breaker devices, they are able to switch these devices back on or switch them o remotely. One or
more relays report the status. According to device standards, ARDs must be able to lock if a system fault is detected. In this case, remote
switching is not possible and manual intervention is necessary. Series DFA devices are only designed for operation on Doepke residual
current circuit-breakers DFS 2 or DFS 4. To optimise costs, the remote actuators are adjusted to the devices' rated currents up to 63 A
or 125 A, respectively. Depending on the design, the DFA devices are operated with dierent supply voltages, are tted with relays to
report the switching or locked status and either do not carry out any switch-on attempts or perform one or three attempts. Furthermore,
some DFA designs are able to connect an interface to the Dupline bus system, which can transmit control commands and status messages
across long distances. The DFA devices are mounted to the RCCBs on the left. This variant is supplied power from a voltage source of
either 24 V AC or DC. The number of restart attempts is xed at "1". The switch-on attempts in automatic mode are performed 15 seconds
after a trip. This device can be decommissioned using a rotary switch on the housing cover so that no inadvertent remote operation, e.g.
during maintenance work on the distribution board, is possible. An internal slot allows for the connection of the DFA-DI interface to the
Dupline bus for transmission of the DFA status and also for its remote control (switching, tripping) across large distances. Remote tripping
through a residual current simulation is also possible. The current switch position of the protective switch ("switched on", "tripped" or
"switched o") is indicated by three integrated relay switching contacts.
Features
retro-ttable remote actuator for Doepke residual current circuit-breakers of series DFS 2 and DFS 4, variants for dierent power supplies,
compact design,
Mounting
mounting by clamping to the left of the residual current circuit-breaker, quick fastening to mounting rail, any installation position
Applications
Remote actuators can be used anywhere where electrical installation are dicult to access or where high system availability should be
achieved, such as on agricultural premises, in small wind power stations, photovoltaic installations, charging stations for electric vehicles,
pump stations, sewage treatment plants and telecommunications systems.
Notes
According to the standard, automatic restart is only permitted in areas where only trained electricians have access. The remote actuator
does not aect the function of the residual current circuit-breaker.
Accessories
DFA-DI, NT 24-0750, NT 24-2000, RK 24
Technical Data
Series
Test residual operating current adjustable
Specification drive mechanism
max. Rated current main contact unit
Number of switch-on attempts
Remote release
Dupline bus connection retro-fittable
suitable for model range
Mounting side

2015_03_13

DFA 2-1
DFA 2 - 1
0.03 A, 0.1 A, 0.3 A, 0.5 A
Motor drive
63 A
1
true
true
DFS 2, DFS 4
left

doepke_09100112_dbl_en.pdf

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