TMC
4
Backup fuse
5
Trigger characteristics
The thermomagnetic circuit breaker is available in
18 nominal current levels and in single and multi-pos.
versions.
NOTE: Use a backup fuse in combination with the
circuit breaker if the maximum switching current
can be exceeded in the event of an error.
The version with the "medium-blow (M1)" trigger
The table lists the maximum switching current, the relevant
internal resistance, and the resulting backup fuse.
characteristic is suitable for AC and DC applications. The
"fast-blow (F1)" characteristic version is suitable for
DC applications.
Nominal
current
NH
backup
fuse
Internal resistance Switching
capacity
The characteristic curves (see page 7) depend on the
ambient temperatures. To avoid early or late disconnection,
the circuit breaker nominal current must be multiplied by a
factor.
F1 (fast- M1
according
blow)
(medium-
blow)
to
for DC
EN 60934
for DC/AC
0.2 A
0.3 A
0.4 A
0.5 A
0.6 A
0.8 A
1 A
1.5 A
2 A
2.5 A
3 A
4 A
5 A
6 A
8 A
10 A
12 A
16 A
Any
Any
Any
Any
Any
39.3
17.5
9.2
6.8
4.2
26.1
11.6
6.6
4.1
3
1.65
1.10
0.47
0.28
0.183
0.124
0.077
0.063
0.045
≤ 0.02
≤ 0.02
400 A
400 A
400 A
400 A
400 A
400 A
400 A
400 A
400 A
400 A
400 A
400 A
400 A
800 A
800 A
800 A
800 A
800 A
Ambient temperature
Multiplication factor
-30°C
-20°C
-10°C
0°C
10°C
20°C
30°C
40°C
50°C
60°C
0.76
0.79
0.83
0.88
0.93
1
1.04
1.11
1.19
1.29
Any
Any
2.8
1.6
25 A
25 A
25 A
25 A
25 A
25 A
50 A
50 A
50 A
50 A
50 A
0.78
0.42
0.26
0.18
0.12
0.092
0.054
0.025
0.022
The characteristic curves (see page 7) are also valid for
multi-position devices if all positions have an equal load. For
multi-position devices and only 1-pos. overload, the thermal
tripping limit changes for characteristic curves F1 and M1 to
a maximum of 1.7 x IN.
For DC, the magnetic operate values of the curves are
around factor 1.3 higher.
≤ 0.02 ≤ 0.02
≤ 0.02 ≤ 0.02
Tripping is supported even with high-energy current peaks
< 0.003 s.
NOTE: When mounting several circuit breakers
in rows, observe the mutual warming effect.
When the circuit breakers are loaded
simultaneously, a mutual warming effect occurs,
which has the same effect as an increase in
ambient temperature.
In this case, the nominal current can only be led to 80%.
Alternatively, the load current can be increased by a
multiplication factor and the circuit breaker dimensioned
accordingly.
100695_en_03
PHOENIX CONTACT
6