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A-35
Motor protection up to 750 kW
Motor rating (kW)
160…750
Compact
NS630b to 1600
PB104839
Breaking
N 50
capacity (kA rms) H
70
380/415 V
L 150
General circuit breaker characteristics
page A-12
Compact NS630b to 1600 circuit breakers equipped with Micrologic control units are
the same as those for distribution systems.
Accompanying control units
page A-20
Micrologic electronic control units may be used on all Compact NS630b to 1600
circuit breakers.
Micrologic 2.0 A and 5.0 A electronic control units provide protection against short-
circuits and overloads. Micrologic 7.0 A provides the same protection functions,
plus earth-leakage protection.
Motor protection
Overview of solutions
The circuit breakers presented here provide protection
against short circuits and are suitable for isolation as
defined by standard IEC 60947-2.
For complete protection of the motor and its control
device, overload protection may be provided by either
the circuit breaker or a separate Schneider Electric
thermal relay.
The control device may be of the direct on-line type
(with or without reversing) or of the “star-delta” type.
Combinations are governed by standard IEC 60947-4.1.
Protection coordination (as defined by
IEC 60947-4)
Whatever the power of the motor, the coordination
between the circuit breaker, contactor and relay
can be of either type 1 or 2.
Selection depends on operational requirements
concerning continuity of service and the technical
skills of servicing personnel.
All type 2 have been tested under the conditions
defined by standards and they are certified
ASEFA/LOVAG.
DB128055
Functions and characteristics
Selection of a trip unit or Micrologic control unit
DB128056
P (kW) (400 V, 50 Hz)
Ir (A)
0.37
1.5
18.5
40
5.5
12
50
37
80 100 160 200
110
220
160
320
250
500 800
560
1000
750
1350
1.1
2.5
Compact
NS630b … NS1600
Micrologic 2.0 A / 5.0 A / 6.0 A / 7.0 A
Micrologic 2.0 E / 5.0 E / 6.0 E