1 Description ESR5-BWS-31-24VDC
ESR5-BWS-31-24VDC
11/23 MN049020EN Eaton.com
12
1.11 Heat dissipation calculation
Input heat dissipation
P
Input
= U
B
²
/ (U
N
/I
N
)
Contact heat dissipation
At equal load currents.
P
Contact
= n x I
L
²
x 200 m
Ω
At different load currents:
P
Contact
= (I
L1
²
+ I
L2
²
+ … + I
Ln
²
) x 200 m
Ω
Total heat dissipations
P
Total
=P
Input
+ P
Contact
now then
P
Total
= U
B
²
/ (U
N
/I
N
) + n x I
L
²
x 200 m
Ω
or
P
Total
= U
B
²
/ (U
N
/I
N
) + (I
L1
²
+ I
L2
²
+ … + I
Ln
²
) x 200 m
Ω
￫
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.
P
Heat dissipation in mW
U
B
Applied operating voltage
U
N
Input rated voltage
I
N
Input current
n
Number of enable current paths used
I
L
Contact load current
