Littelfuse D0400 User Manual
Short Form Catalogue
Arc-fault
Protection System
Protection of Switchboards
• Improve personnel safety.
• Minimize production down
time.
• Reduce damage to material
and the cost of repair or
replacement.
Arcing faults in switchboards can cause
severe damage against material as well as
personnel.
The main issue is that no two arcing are the
same, and it is therefore very difficult to
know in advance how to prevent them.
Whenever arcing occurs the pressure generated by the rapid increase in temperature
is strong enough to break off cabinet doors.
Further the light of the arcing, ultraviolet,
and infrared, is dangerous for personnel, eyes
and skin.
All of the above points should be taken into
consideration in the Total Cost of Ownership, TCO, of a switchboard, and by using
the SELCO Arc Detecting Relays you will be
able to reduce these costs and eliminate the
points listed.
2
Arc-fault Protection System
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 detectors suitably placed in the various cubicles or drawers inside the
switchboard. The Overcurrent Relay is used if overcurrent protection is required as well.
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.
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 drawer, see drawings on page 4.
At horizontal/vertical bus bars (1) and
in breaker/cable compartments (2).
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