Littelfuse D0400 Series - Manual (Page 2)

Arc Detecting Relay/
Current Relay/Time Relay
To be placed in the switchboard or in
connection with it. It is recommended
that the Arc Detecting Relay, the Current
Relay and the Time Relay are installed
in the relay box or otherwise separated
from the circuit breaker to
be tripped.
Arc-fault Protection System
Junction box for parallel
connection
To be installed considering the length of
the detector cables (5 metres). Junction
boxes with indication are installed so
that the LED’s are fully visible. Max. 2
junction boxes per Arc Detecting Relay.
Arc Detectors
Installation: 1-2 pcs. per cubicle or draw-
er, see drawings on page 4.
At horizontal/vertical bus bars (1) and
in breaker/cable compartments (2).
The SELCO Arc-fault Protection System is based on experience
with arc protection since 1962. The system units are built into
boxes all fitting 35mm DIN-rails. Front plates are dimensioned
to fit into the 45mm slot in the cover plates of a DIN-system.
The Arc Detecting Relay is connected to light sensitive detec-
tors suitably placed in the various cubicles or drawers inside the
switchboard. The Overcurrent Relay is used if overcurrent protec-
tion is required as well.