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Dimensions
Section 10
Circuits supplied with DC current
Choosing a circuit breaker
Miniature circuit
breakers
9
Choosing DC circuit-breakers
Type
Rated current (A)
Breaking capacity (kA) (L/R < 0.015 s)
Overload
protection
thermal
Magnetic
threshold
overrating
coefficient
(The number of poles contributing to breaking is given in brackets)
24/48V 60V 125V 125V 250V 500V 750V 1000V
Multi 9
C32H-DC
(1)
1-2-3-6-10-16-20-25-32-40
20 (1P)
10 (1P) 20 (2P) 10 (2P)
Special DC Special DC
XC40
10-15-20-25-32-38
15 (1P)
20 (2P) 45 (3P) 50 (4P)
Ditto AC
1.43
C60N
6-10-16-20-25-32-40-50-63
15 (1P)
20 (2P) 30 (3P) 40 (4P)
Ditto AC
1.38
C60H
1-2-3-6-10-16-20-25-32-40-50-63
20 (1P)
25 (2P) 40 (3P) 50 (4P)
Ditto AC
1.38
C120H
10-16-20-25-32-40-50-63-80-100-125 15 (1P)
15 (1P)
15 (2P)
Ditto AC
1.4
Compact
NS100N
16-25-40-63-80-100
50 (1P)
50 (1P)
50 (1P) 50 (1P)
Protection by thermal magnetic
trip unit identical to the trip units
used in AC current
NS100H
16-25-40-63-80-100
85 (1P)
85 (1P)
85 (1P) 85 (1P)
NS100L
16-25-40-63-80-100
100 (1P)
100 (1P)
100 (1P) 100 (1P)
NS160N
80-100-125-160
50 (1P)
50 (1P)
50 (1P) 50 (1P)
NS160H
80-100-125-160
85 (1P)
85 (1P)
85 (1P) 85 (1P)
NS160L
80-100-125-160
100 (1P)
100 (1P)
100 (1P) 100 (1P)
NS250N
160-200-250
50 (1P)
50 (1P)
50 (1P) 50 (1P)
NS250H
160-200-250
85 (1P)
85 (1P)
85 (1P) 85 (1P)
NS250L
160-200-250
100 (1P)
100 (1P)
100 (1P) 100 (1P)
NS400H
MP1/MP2
85 (1P)
85 (1P)
85 (1P) 85 (1P)
Thermal
inoperative,
provide an
external relay
(if necessary)
Special
MP1/MP2/MP3
P21/P41
DC current
(2)
trip units
NS630H
MP1/MP2/MP3
85 (1P)
85 (1P)
85 (1P) 85 (1P)
C1251N-DC
P21/P41-1250
50 (1P)
50 (1P)
50 (1P) 50 (1P) 25 (3P)
Masterpact
M10-DC
1000
100 (3P)
100 (3P)
100 (3P) 100 (3P) 100 (3P) 100 (3P)
Dina
(3)
1.5-50kA
M20-DC
2000
100 (3P)
100 (3P)
100 (3P) 100 (3P) 100 (3P) 100 (3P)
Dina
(3)
1.5-50kA
M40-DC
4000
100 (3P)
100 (3P)
100 (3P) 100 (3P) 100 (3P) 100 (3P)
Dina
(3)
1.5-50kA
M60-DC
6000
100 (4P)
100 (4P)
100 (4P)
Dina
(3)
9-40kA
M80-DC
8000
100 (4P)
100 (4P)
100 (4P)
Dina
(3)
9-40kA
(1) The C32H-DC special DC circuit-breaker is equipped with a permanent magnet, which requires strict respect of polarities
(2) For memory:
MP1 Im adjustable from 800 to 1600 A
MP2 Im adjustable from 1200 to 2500 A
MP3 Im adjustable from 2000 to 4000 A
P21-1250 Im adjustable from 1600 to 3200 A
P41-1250 Im adjustable from 3200 to 6400 A
(3) There are 7 versions of the dina 1500/3000 A trip units - 3/6 kA - 6/12 kA - 12/20 kA - 9/18 kA - 12/24 k A - 20/40 kA. Note: the masterpact switches, HI type in
the three-pole version with a rating from M08 to M63, can be used in DC up to 125 V DC (one pole on the positive polarity, one pole on the negative polarity and
one pole not used).