Useful Information from Everyday Practice
3.15.2
U/I Characteristic
Power supply units with U/I characteristic are electronically protected against overload and
short circuit. For a 24 V DC voltage, the maximum output current is typically 1.1 times the
nominal current. In the event of an overload or a short circuit the output current of
1.1 times I N is still available while the output voltage is reduced.
U out [V]
24
I out [A]
I N
1.1 x I N
5598D020
Figure 3-27
U/I characteristic
There are two significant advantages of using devices with U/I characteristic compared to
using devices with fold-back characteristic:
Capacitive loads of any size and loads with DC/DC converter can be started.
When dividing the output into individual, selectively fused current paths reliable fuse
blowing is ensured thanks to the continuous current (see also section 3.7, "Selective
This makes power supply units with this characteristic more suitable for use in the industrial
area.
5598_en_03
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