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Compact NSX motor-feeder solutions
Compact NSX motor circuit breakers are
designed for motor-feeder solutions using:
b
three devices, including an MA or 1.3-M
magnetic-only trip unit
b
two devices including a TM-D or 2-M
thermal-magnetic trip unit.
They are designed for use with contactors in
the AC3 utilisation category (80 % of all
cases) and they ensure type-2 coordination
with the contactor.
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conditions generally make it necessary to
oversize the protection circuit breaker with
respect to the AC3 category.
Compact NSX motor-protection range
Compact NSX trip units can be used to create motor-feeder solutions comprising two
or three devices. The protection devices are designed for continuous duty at 65 °C.
Three-device solutions
1 NSX circuit breaker with an MA or Micrologic 1.3-M trip unit
b
1 contactor
b
1 thermal relay.
b
Two-device solutions
1 Compact NSX circuit breaker
b
with a Micrologic 2.2-M or 2.3-M electronic trip unit
v
with a Micrologic 6 E-M electronic trip unit. This version offers additional protection
v
and Power Meter functions.
1 contactor.
b
Type of motor protection
3 devices
2 devices
Compact NSX circuit breaker
NSX100/160/250
NSX400/630
NSX100 to 630
Type-2 coordination with Contactor + thermal relay
Contactor
Trip unit
Type
MA
Micrologic 1.3-M
Micrologic 2-M
Micrologic 6 E-M
Technology
Magnetic
Electronic
Electronic
Electronic
Thermal relay Separate
b
b
Built-in, class
5
b
b
10
b
b
20
b
b
30
b
Protection functions of Compact NSX circuit breaker
Short-circuits
b
b
b
b
Overloads
b
b
Insulation
faults
Ground-fault
b
Special motor
functions
Phase unbalance
b
b
Locked rotor
b
Under-load
b
Long start
b
Built-in Power Meter functions
I, U, energy
b
Operating assistance
Counters (cycles, trips,
alarms, hours)
b
Contact-wear indicator
b
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image
b
559E1500.indd
version: 1.0