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Functions and
characteristics
Motor protection
MA and Micrologic 1.3-M
instantaneous trip units
MAmagnetic trip units
Circuit breakers with an MA trip unit are combined with a thermal relay and a
contactor or a starter.
Protection
……………………………………………
Magnetic protection (Im)
Short-circuit protection with an ad
j
ustable pick-up Im that initiates instantaneous
tripping if exceeded.
Im
b
= In x ... is set on an ad
j
ustment dial in multiples of the rating:
6 to 14 x In (2.5 to 100 A ratings)
v
9 to 14 x In (150 to 200 A ratings)
v
Protection version
3-pole (3P 3D): 3-pole frame (3P) equipped with detection on all 3 poles (3D).
b
Micrologic 1.3-M trip units
Circuit breakers with a Micrologic 1.3-M trip unit are combined with a thermal relay
and a contactor.
Protection
..............................................................
Settings are made using a dial.
Short-circuits: Short-time protection (Isd)
Protection with an ad
j
ustable pick-up Isd. There is a very short delay to let through
motor starting currents.
Isd is set in amperes from 5 to 13 x In, as follows:
b
from 1600 to 4160 A for the 320 A rating.
v
from 2500 to 6500 A for the 500 A rating.
v
Short-circuits: Non-adjustable instantaneous protection (li)
Instantaneous protection with non-ad
j
ustable pick-up Ii.
Protection version
3-pole (3P 3D): 3-pole frame (3P) equipped with detection on all 3 poles (3D).
b
Indications
…………………………………………
Front indications
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b
event of a fault.
MAmagnetic trip units are used in
3-device
motor-feeder solutions
. They can be
mounted on all Compact NSX100/160/250
circuit breakers with performance levels
B/F/H/N/S/L.
They provide short-circuit protection for
motors up to 110 kW at 400 V.
Micrologic 1.3-M trip units are used in
3-
device motor-feeder solutions
on
Compact NSX400/630 circuit breakers with
performance levels B/F/H/N/S/L.
They provide short-circuit protection for
motors up to 250 kW at 400 V.
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technology:
b
accurate settings
b
tests
b
"Ready" LED.
Note:
all the trip units have a transparent lead-sealable cover
that protects access to the adjustment dials.
DB112110
50
A
DB112106
559E1500.indd
version: 1.0