Power supply ICOS-PS 3160 series
Installation, use and maintenance manual - EN
Ver. 1.05
26
5.5.2 Conductors and protective devices
5.5.2.1 Protection for UL applications
5.5.2.2 Protection for other applications
The device and the power conductors can be protected by fuses or by automatic circuit breakers; the sizing of
the conductors depends on the protection device type and its size.
The rated current of the protection device depends on the input current absorbed by the power supply unit; it
cannot be determined in advance, because it strongly depends on the line impedance and on the inductance
of an auxiliary reactor.
The tables here below indicate the recommended conductors and protective devices. We suppose that the in-
put current is known and the cables are installed according to B1 method; for other methods of installation, refer
to the IEC 60364-5-52 standard to calculate the current carrying capacity of the conductors.
The breaking capacity of the protective device must not be lower than the prospected short-circuit current at
the point of installation.
In case of protection by means of fuses, it is recommended to use 10 x 38 mm class gG cartridge-type fuses.
The following table shows the recommended solutions:
This device is Suitable For Use On A Circuit Capable Of Delivering Not More Than 5000
Arms Symmetrical Amperes, 230Vac Maximum when protected by semiconductor fuse
model FR14GR69V40T by Mersen.
Input current
[ARMS a 40°C]
Fuse size [A]
Temperature [°C]
Conductor cross-section
[mm²]
PVC 70°C
EPR 90°C
I < 20
20
T < 40
4
2.5
40 ≤ T < 55
6
4
20 ≤ I < 25
25
T < 40
6
4
40 ≤ T < 55
10
4
25 ≤ I < 28
32
T < 40
10
6
40 ≤ T < 55
16
6
