5/49
Circuit breaker TX
3
6000 A
up to 63 A (1 module per pole)
Cat. N° (s) : 4 033 49 to 4 035 68, 4 037 12 to 4 037 78
5. GENERAL CHARACTERISTICS
(continued):
Derating of circuit-breakers according to ambient temperature :
. The nominal characteristics of a circuit breaker are modified according to the ambient temperature inside the cabinet or the enclosure where the
circuit breaker is located.
. Reference temperature: 30 °C in accordance with IEC/EN 60898-1
Ambient Temperature / In
In (A)
- 25°C
- 10°C
0°C
10°C
20°C
30°C
40°C
50°C
60°C
70°C
0,5
0.62
0.6
0.57
0.55
0.52
0.5
0.47
0.42
0.40
0.38
1
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
2
2.8
2.6
2.5
2.3
2.2
2
2
1.9
1.8
1.7
3
3.8
3.6
3.5
3.3
3.2
3.0
2.9
2.8
2.7
2.6
4
4.5
4.2
4.0
3.9
3.7
3.5
3.4
3.3
3.2
3.1
6
7.5
7.0
6.6
6.4
6.2
6.0
5.8
5.6
5.4
5.3
8
9.6
9.2
8.9
8.6
8.3
8
7.8
7.5
7.3
7
10
12.5
11.5
11.1
10.7
10.3
10.0
9.7
9.3
9.0
8.7
13
16.3
15
14.3
13.9
13.4
13
12.6
12.1
11.7
11.3
16
20.0
18.7
18.0
17.3
16.6
16.0
15.4
14.7
14.1
13.5
20
25.0
23.2
22.4
21.6
20.8
20.0
19.2
18.4
17.6
16.8
25
31.5
29.5
28.3
27.2
26.0
25.0
24.0
22.7
21.7
20.7
32
41.0
37.8
36.5
34.9
33.3
32.0
30.7
29.1
27.8
26.5
40
51.0
48.0
46.0
44.0
42.0
40.0
38.0
36.0
34.0
32.0
50
64.0
60.0
57.5
55.0
52.5
50.0
47.5
45.0
42.5
40.0
63
80.6
75.6
72.5
69.9
66.1
63.0
59.8
56.1
52.9
49.7
Derating of MCB for use with fluorescent lights:
Ferromagnetic and electronic ballasts have a high inrush current for a short time. These currents can cause the tripping of circuit breakers.
At the time of the installation, it should take into account the maximum number of ballasts per circuit breaker that the manufacturers of lamps and
ballasts indicate in their catalogues.
Influence of the altitude:
≤2000 m
3000 m
4000 m
5000 m
Dielectric holding
3000 V
2500 V
2000 V
1500 V
Max operational Voltage
400 V
400 V
400 V
400 V
Derating at 30°C
none
none
none
none
Derating of MCBs function of the number of devices side by side:
When several MCBs are juxtaposed and operate simultaneously, the thermal evacuation of the poles is limited. This results in an increase in
operating temperature of the circuit breakers which can cause unwanted tripping. It is recommended to apply the following coefficients to the rated
currents.
Number of circuit breakers
side by side
Coefficient
2 - 3
0.9
4 – 5
0.8
6 - 9
0.7
10
0.6
These values are given by the recommendation of IEC 61439-1, NF C 63421 and EN 61439-1 standards.
To avoid using these coefficients, it is necessary to allow a good ventilation and to separate the devices with 0.5 module spacing elements (cat. N°
4 063 07).
Technical data sheet: F01547EN/01
Updated: 15/10/2014
Created: 30/05/2014
