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9
Thermal Overload Protection (49-1, 49-2)
t
=
Figure 9.1
Overload Time Characteristic with a 0% Preload and 90% Preload
110
2
(
⁄
)
⎛
⎞
I
I
load
max
τ
×
⎜
⎟
----------------------------------------
ln
⎝
⎠
2
(
⁄
)
I
I
–
1
load
max
0% Preload
I
load
--------- -
I
max
τ
×
t
=
ln
90% Preload
2
2
(
⁄
)
(
)
⎛
⎞
I
I
–
0.90
load
max
⎜
⎟
-------------------------------------------------------
⎝
⎠
2
(
⁄
)
I
I
–
1
load
max
PRIM-2330C
7UT51 v3
I
load
--------- -
I
max
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