3RA1 fuseless load feeders
SIRIUS System Manual
5-2
GWA 4NEB 430 0999-02b
5.1 Specifications/regulations/approvals
Coordination types
The fuseless load feeders are manufactured and tested in acc. with IEC
60947 Part 1 and Part 2.
An important selection criterion for the fuseless load feeders are the coordi-
nation types.
IEC 60947-4-1/DIN VDE 0660 Part 102 draws a distinction between two
coordination types, known as coordination type 1 and coordination type 2.
They describe what happens at a short circuit and the device status after a
short circuit. In both coordination types, the short circuit to be dealt with is
reliably disconnected. There must be no damage to systems or injury to per-
sons. The differences lie only in the degree to which the device is damaged
after the short circuit.
Coordination type 1
The fuseless load feeder can be inoperable after each short-circuit discon-
nection. Damage to the contactor and the circuit breaker is permissible.
Coordination type 2
After a short-circuit disconnection, there must not be any damage to the
overload release or any other part. The 3RA1 fuseless load feeder can be put
into operation again without the need for replacement. Only welding of the
contactor contacts is permissible if they can be separated easily without any
significant deformation.
Approvals/test reports
All the approvals and test certificates of the individual devices used in the
feeders are valid.
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