Electromagnetic Compatibility - Siemens 3RW44 Manual

11.3.5

Electromagnetic compatibility

Types of coordination
The DIN EN 60947-4-1 (VDE 0660 Part 102) or IEC 60947-4-1 standard distinguishes
between two types of coordination, 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
The fuseless load feeder may be non-operational after a
short circuit has been cleared. Damage to the contactor or
to the overload release is permissible. For 3RA1 load
feeders, the circuit breaker itself always achieves type 2
coordination.
3RW44 soft starters
Manual, 03/2017, NEB535219502000/RS-AB/008
Type of coordination 2
There must be no damage to the overload release or to any
other components after a short circuit has been cleared. The
3RA1 fuseless load feeder can resume operation without
needing to be renewed. At most, welding of the contactor
contacts is permissible if they can be disconnected easily
without any significant deformation.
General technical data
11.3 Technical data
269