
7SR21 & 7SR22 Performance Specification
Unrestricted Page 30 of 68
© 2013 Siemens Protection Devices Limited
2.9
49 Thermal Overload
2.9.1
Reference
Parameter
Value
Is
Overload setting
0.10, 0.11… 3
xIn
t
Time constant setting
1, 1.5… 1000 min
2.9.2
Operate and Reset Level
Attribute
Value
I
ol
Overload level
100 %
Is
,
±
5 % or
±
1%
In
Reset level
³
95 %
I
ol
Repeatability
±
1 %
Variation
-10 °C to +55 °C
£
5 %
f
nom
- 3 Hz to
f
nom
+ 2 Hz
£
5 %
2.9.3
Operate and Reset Time
Attribute
Value
t
op
Overload trip operate time
(
)
þ
ý
ü
î
í
ì
´
-
-
´
t
=
2
2
2
P
2
I
I
I
ln
B
I
k
t
where
I
P
= prior current
±
5 % o r
±
1 0 0 m s ,
(For I
s
range 0.3 xI
n
to 3 xI
n
)
Repeatability
±
100 ms
Summary of Contents for Argus 7SR21
Page 1: ...Energy Management 7SR21 7SR22 Argus Overcurrent Relay Reyrolle Protection Devices ...
Page 2: ......
Page 4: ...Contents 7SR11 and 7SR12 Page 2 of 2 2018 Siemens Protection Devices Limited ...
Page 185: ...7SR210 Settings Guide Unrestricted 2018 Siemens Protection Devices Limited Page 61 of 61 ...
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Page 382: ...7SR220 Technical Manual Chapter 4 Page 2 of 96 2017 Siemens Protection Devices Limited ...
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