TMC
100695_en_03 PHOENIX CONTACT 6
4Backup fuse
The table lists the maximum switching current, the relevant
internal resistance, and the resulting backup fuse.
5 Trigger characteristics
The thermomagnetic circuit breaker is available in
18 nominal current levels and in single and multi-pos.
versions.
The version with the "medium-blow (M1)" trigger
characteristic is suitable for AC and DC applications. The
"fast-blow (F1)" characteristic version is suitable for
DC applications.
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.
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 I
N
.
For DC, the magnetic operate values of the curves are
around factor 1.3 higher.
Tripping is supported even with high-energy current peaks
< 0.003 s.
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.
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.
Nominal
current
NH
backup
fuse
Internal resistance Switching
capacity
according
to
EN 60934
F1 (fast-
blow)
for DC
M1
(medium-
blow)
for DC/AC
0.2 A Any 39.3 26.1 400 A
0.3 A Any 17.5 11.6 400 A
0.4 A Any 9.2 6.6 400 A
0.5 A Any 6.8 4.1 400 A
0.6 A Any 4.2 3 400 A
0.8 A Any 2.8 1.65 400 A
1 A Any 1.6 1.10 400 A
1.5 A 25 A 0.78 0.47 400 A
2 A 25 A 0.42 0.28 400 A
2.5 A 25 A 0.26 0.183 400 A
3 A 25 A 0.18 0.124 400 A
4 A 25 A 0.12 0.077 400 A
5 A 25 A 0.092 0.063 400 A
6 A 50 A 0.054 0.045 800 A
8 A 50 A 0.025 ≤ 0.02 800 A
10 A 50 A 0.022 ≤ 0.02 800 A
12 A 50 A ≤ 0.02 ≤ 0.02 800 A
16 A 50 A ≤ 0.02 ≤ 0.02 800 A
Ambient temperature Multiplication factor
-30°C 0.76
-20°C 0.79
-10°C 0.83
0°C 0.88
10°C 0.93
20°C 1
30°C 1.04
40°C 1.11
50°C 1.19
60°C 1.29
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.
