B&B Electronics NTPS-48-5 - Datasheet - Manual (Page 19)

CS10.481
C–Series
48V, 5A, S INGLE P HASE I NPUT
Nov. 2006 / Rev.1.1 DS-CS10.481-EN
All parameters are specified at 48V, 5A, 230Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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19/20
25.9. E
XTERNAL
I
NPUT
P
ROTECTION
The unit is tested and approved for branch circuits up to 20A. External protection is only required if the supplying
branch has an ampacity greater than this. In some countries local regulations might apply. Check also local codes and
local requirements.
If an external fuse is necessary or utilized, a minimum value is required to avoid undesired tripping of the fuse.
B-Characteristic C-Characteristic
Ampacity max. 20A 20A
min. 10A 6A
25.10. O
PERATION ON
T
WO
P
HASES
Fig. 25-6 Schematic for two phase operation
240V
+
10%
ma
x.
Fuse
L2
L1
L3
L
N
PE
Power Supply
AC
DC
internal
fused
Instructions for two phase operation:
a)
A phase to phase connection is allowed as long as the
supplying voltage is below 240V
+10% .
b) Use a fuse or a circuit breaker to protect the N input. The
N input is internally not protected and is in this case
connected to a hot wire.
Appropriate fuses or circuit breakers are specified in section 25.9
“External Input Protection”.
25.11. U
SE IN A
T
IGHTLY
S
EALED
E
NCLOSURE
When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher
than outside. The inside temperature defines the ambient temperature for the power supply.
Results from such an installation:
Power supply is placed in the middle of the box, no other heat producer inside the box
Enclosure: Rittal Type IP66 Box PK 9519 100, plastic, 180x180x165mm
Load: 48V, 4A; (=80%) load is placed outside the box
Input: 230Vac
Temperature inside the box: 48.9°C (in the middle of the right side of the power supply with a distance of 2cm)
Temperature outside the box: 23.3°C
Temperature rise: 25.6K