Datasheet
CT10.241
C-Series
24V, 10A, THREE PHASE INPUT
23.5. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 30A (U.S.A.) and 32A (IEC). An external protection is only
required, if the supplying branch has an ampacity greater than this. Check also local codes and local requirements. In
some countries local regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 6A B- or 3A C-Characteristic breaker should be used
23.6. USING ONLY 2 LEGS OF A 3-PHASE SYSTEM
19/22
oss
e
The power supply is allowed to run permanently on two legs of a 3-phase
system, when the output power is reduced according to the curves below. A
long-term exceeding of these limits will result in a thermal shut-down of the
unit. No external protection device is required to protect against a phase-l
failure. EMC performance, hold-up time and losses differ from a three phas
operation. Therefore, check suitability of your individual application. The
screw of the terminal which remains unused must be securely tightened.
Using only two legs of a 3-phase system is not included in the UL approval. Therefore, additional testing might be
necessary.
DC
L1
L2
L3
open
AC
L1
L2
L3
PE
Power Supply
Fig. 23-4
Allowed output current for use on only two
legs of a 3-phase system
Fig. 23-5
Hold-up time for use on only two legs
of a 3-phase system
Allowed Output Current at 24V (2-Ph)
0
-25 0 20
70°
C
2
4
6
8
10
12A
Ambient Temperature
40 60
A
.
.
.
2
x
3
4
0
-
5
7
6
V
a
c
B
.
.
.
2
x
3
2
0
-
3
4
0
V
a
c
C
.
.
.
s
h
o
r
t
t
e
r
m
2
x
3
2
0
-
5
7
6
V
a
c
B
A
C
0
20
40
60
100ms
320 360 400 440 2x480Vac
Input Voltage
Hold-up Time at 24Vdc
5A
,
t
yp.
1
0
A
,
t
y
p
.
1
0
A
,
mi
n
.
5
A
,
m
i
n
.
80
Fig. 23-6
Efficiency vs. output current at 24V for use on
only two legs of a 3-phase system
Fig. 23-7
Losses vs. output current at 24V for use on
only two legs of a 3-phase system
Efficiency
2
89
91
93
88
94%
12
A
4810
Output Current
6
90
92
2x400Vac
2x480Vac
Power Losses
024 81012
A
0
4
12
20
24W
2x480Vac
2x400Vac
8
6
16
Output Current
Jan. 2010 / Rev. 1.3 DS-CT10.241-EN
All parameters are specified at 24V, 10A, 3x400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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