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16 Hz 2/3 network protection
Micrologic 5 A-Z trip unit
Compact NSX circuit breakers may be used
on 16 Hz 2/3 systems with special thermal-
magnetic and electronic (Micrologic 5 A-Z)
trip units.
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Single-phase distribution networks with a frequency of 16 Hz 2/3 are used for
railroad applications in certain European countries.
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Compact NSX circuit breakers of the 3P 2D or the 3P 3D type protect 16 Hz 2/3
networks at 250 V or 500 V.
They can be equipped with either:
a
b
TM-D thermal-magnetic trip unit for Compact NSX100 to 250
or an electronic Micrologic 5.2 A-Z trip unit for Compact NSX100 to 250 or
b
a 5.3 A-Z for Compact NSX400/630.
The possible breaking-capacity performance levels are B, F, N and H as indicated
below.
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Operating voltage
TMD and Micrologic 5 A-Z trip units
Performance
B
F
N
H
250 V / 500 V
Icu (kA)
25
36
50
70
Protection
TM-D thermal-magnetic trip units
Trip-unit selection
Rating
16 88
100
160
250
400
630
Compact
NSX100
TM-D
NSX160
TM-D
NSX250
TM-D
NSX100 to 250
Micrologic 5.2 A-Z
NSX400/630
Micrologic 5.3 A-Z
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DB112046
DB112153
The 16 Hz 2/3 frequency does not modify the thermal settings with respect to those
at 50 Hz
(see page A-15)
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Magnetic
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Rating (A) In at 40 °C
16 25 32 40 50 63 80 100 125 160 200 250
Pick-up (A)
Im
accur. ±20% Fixed
Ad
j
ustable
NSX100
50Hz
190 300 400 500 500 500 640 800
16Hz 2/3 170 270 360 450 450 450 580 720
NSX160/250 50Hz
190 300 400 500 500 500 640 800 1250 1250 5 to 10 In
16 Hz 2/3 170 270 360 450 450 450 580 720 1100 1100 4.5 to 9 In
Micrologic 5 A-Z trip units
Micrologic 5.2 A-Z and 5.3 A-Z are dedicated to 16 Hz 2/3 networks.
They use a suitable sampling frequency. The protection settings are identical to
those of Micrologic 5 A
(see page A-19)
. They also offer a current-measurement
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Phase and isolated neutral interrupted- 250 / 500 V
2 poles in series - Earthed neutral - 250 / 500 V
B and F (3P 2D version)
N and H (3P 3D version)
B and F (3P 2D version)
N and H (3P 3D version)
DB115575
L
N
lo
a
d
DB115576
L
N
lo
a
d
DB115577
L
N
lo
a
d
DB115578
L
N
lo
a
d
Remark. For an operating voltage > 250 V, the installation must be
designed to eliminate all risk of double earth faults.
A-51
559E1600.indd
version: 1.0