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IB IL 24/230 DOR 1/W
16
5663BC01
Power Dissipation
Formula to Calculate the Power Dissipation in the Terminal
P
EL
= P
BUS
+ (P
REL
) + P
L
P
EL
= 0.19 W + (0.26 W) + I
L
2
x 0.5
For a N/C contact, the term P
REL
in the formula does not apply.
Where
P
EL
Total power dissipation of the terminal
P
BUS
Power dissipation through the bus operation
P
REL
Power dissipation of the relay coil
P
L
Power dissipation through the load current via the contacts
I
L
Load current of the output
Power Dissipation of the Housing Depending on the Ambient Temperature
Where
P
HOU
Permissible power dissipation of the housing
T
U
Ambient temperature
P
H O U
= 1 . 2 W
P
H O U
= 1 . 2 W
- ( ( T
U
- 2 5 ° C [ - 1 3 ° F ] ) x 0 . 0 2 W
/ K )
- 2 5 ° C ( - 1 3 ° F ) < T
U
≤
+ 2 5 ° C ( 7 7 ° F )
+ 2 5 ° C < T
U
≤
+ 5 5 ° C ( 1 3 1 ° F )
Derating When Using the N/O Contact
Ambient Temperature T
U
Power Dissipation of the
Housing
Maximum Load Current
40°C (104°F)
0.9 W
3.0 A
45°C (113°F)
0.8 W
3.0 A
50°C (122°F)
0.7 W
2.6 A
55°C (131°F)
0.6 W
1.8 A
The maximum permissible current load of 3.0 A can flow via the N/O contact up to an ambient
temperature of 40°C (104°F). Observe the derating at higher temperatures.
