Operating instructions Dcontrol Date 0730
TBL02_54-GB 0730 Part-No. 00153238-GB
Page 7 / 28
3.4 Power decrease for increased ambient temperatures
The unit´s maximum permissible ambient temperature is depending on version 40° C, or 50°C.Up to that temperature a
load of the quoted rated current is possible. The removal of heat in the unit due to power dissipation is dependent on the
ambient temperature, so the maximum load has to be reduced if the ambient temperature is higher than 40° C or 50°C!
For each degree higher the load has to be reduced approx.. 2.2%.
The median (measured 24 h) has to be 5° C below the max. ambient temperature. Pay attention of the unit´s power
dissipation and their possible effects on the ambient temperature if the unit is mounted in a switch cabinet () General
description: Technical data)!
Maximum load for ambient temperatures higher 40°C for versions with internal fuses
Type Part-No.
Rated current
for 40°C
max. current load
for 45°C
max. current load
for 50°C
max. current load
for 55°C
PKDT5 304555 5 4,5 3,9 3,4
PKDT5 304556 5 4,5 3,9 3,4
PKDM5 304558 5 4,5 3,9 3,4
PKDM10 304559 10 8,9 7,8 6,7
PKDM12 304570 12 10,7 9,4 8,0
PKDM15 304560 15 13,4 11,7 10,1
PKDM20 305594 20 17,8 15,6 13,4
PKDM20(500V) 305600 20 17,8 15,6 13,4
PKDM25 305532 25 22,3 19,5 16,8
PKDM35 305533 35 31,2 27,3 23,5
PKDM50 305563 50 44,5 39,0 33,5
PKDM80 305564 80 71,2 62,4 53,6
Maximum load for ambient temperatures higher 50°C for versions without internal fuses
Type Part-No.
Rated current
for 50°C
max. current load for
55°C
PKDT5Z 304573 5 4,5
PKDM10Z 304574 10 8,9
PKDM12Z 304575 12 10,7
PKDM15Z 304576 15 13,4
PKDM20Z 305597 20 17,8
PKDM25Z 305576 25 22,3
PKDM25E 305547 25 22,3
PKDM35Z 305533 35 31,2
PKDM35E 305548 35 31,2
PKDM50Z 305563 50 44,5
PKDM50E 305563 50 44,5
PKDM80Z 305564 80 71,2
PKDM80E 305589 80 71,2
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