Cover unused inputs with dust caps.
Arc protection with one protection relay
In installations, with limited possibilities to realize signalling between protection relays
protecting incoming and outgoing feeders, or if only the protection relay for the incoming
feeder is to be exchanged, an arc protection with a lower protective level can be achieved
with one protection relay. An arc protection with one protection relay only is realized by
installing two arc lens sensors connected to the protection relay protecting the incoming
feeder to detect an arc on the busbar. In arc detection, the arc protection stage trips the
circuit breaker of the incoming feeder. The maximum recommended installation distance
between the two lens sensors in the busbar area is six meters and the maximum distance
from a lens sensor to the end of the busbar is three meters.
Section 4 1MAC059074-MB A
Protection functions
744 615 series ANSI
Technical Manual
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