SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
757
Appendix A
A
A.1 Types of coordination
Types of coordination
Standard DIN EN 60947-4-1 (VDE 0660 Part 102) or IEC 60947-4-1 distinguishes between
two types of coordination (type of coordination), which are referred to as coordination type
"1" and coordination type "2". The short circuit that needs to be dealt with is cleared reliably
and safely with both types of coordination; the only differences are in the extent of the
damage sustained by the device following a short circuit.
Type of coordination 1
It is permissible for the fuseless load feeder to be incapable of functioning after each short-
circuit disconnection. Damage to the contactor and the overload release is also permissible.
For 3RA2, the motor starter protector alone always achieves type of coordination "2".
Type of coordination 2
After short-circuit disconnection, there must be no damage to the overload release or to any
other part. The 3RA2 fuseless load feeder can resume operation without any parts having to
be repaired or replaced. Welding of the contactor contacts only is permitted if these can be
separated easily without significant deformation.
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