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1 Description ESR5-NO-31-24VDC
1.11 Heat dissipation calculation
11
￫
The safety relay's total heat dissipation is yielded by the input
heat dissipation and the contact heat dissipation with equal or
different load currents.
Input heat dissipation
²
P
= U
/ (U
/I
)
Input
B
N
N
Contact heat dissipation
At equal load currents.
²
P
= n x I
x 200 mΩ
Contact
L
At different load currents:
²
²
P
= (I
+ I
+ ... + I
Contact
L1
L2
Total heat dissipations
P
=P
+ P
Total
Input
Contact
now then
²
P
= U
/ (U
/I
) + n x I
Total
B
N
N
or
²
P
= U
/ (U
/I
) + (I
Total
B
N
N
P
Heat dissipation in mW
U
Applied operating voltage
B
U
Input rated voltage
N
I
Input current
N
n
Number of enable current paths used
I
Contact load current
L
ESR5-NO-31-24VDC 11/23 MN049018EN Eaton.com
²
) x 200 mΩ
Ln
²
x 200 mΩ
L
²
²
²
+ I
+ ... + I
) x 200 mΩ
L1
L2
Ln
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