Siemens 7SR51 - 10.11 49 Thermal Overload Protection

49 Thermal Overload Protection
Reference
Parameter Value
I
set
Overload setting 0.1 to 3 ⋅ I
rated
, Δ 0.01 I
rated
T
th
Time constant setting 0.5 to 1000 min, Δ 0.5 min
Operate and Reset Level
Attribute Value
I
op
Operate level I
set
: ± 5 % or ± 1 % I
rated
Reset level ≤ 95 % I
op
Repeatability ± 1 %
Variation IEC
60255-1
-10 °C to +55 °C ≤ 5 %
f
rated
± 5 % ≤ 5 %
Operate and Reset Time
Attribute Value
t
op
Overload trip operate time
(min)
± 5 % or ± 100 ms, (I
set
: 0.3 to 3
⋅ I
rated
)
I = Average rms current
I
p
= Pre‑load current
I
θ
= Thermal overload setting
current
τ = Thermal heating time
constant (minutes)
ln = Natural logarithm
t = Operate time (minutes)
Repeatability ± 100 ms
Current
(multi-
ples of
setting
)
Operate time t for various time constraints (s)
0.5 min 1 min 2 min 3 min 5 min 10 min 15 min 20 min 30 min 50 min 100
min
1.2 35.57 71.14 142.27 213.41 355.69 711.37 1067.0
6
1422.7
5
2134.1
2
3556.8
7
7113.7
4
1.5 17.63 35.27 70.53 105.8 176.34 352.67 529.01 705.34 1058.0
2
176..36 3526.7
2
2 8.63 17.26 34.52 51.78 86.3 172.61 258.91 345.22 517.83 863.05 1726.0
9
2.5 5.23 10.46 20.92 31.38 52.31 104.61 156.92 209.22 313.84 523.06 1046.1
2
3 3.53 7.07 14.13 21.2 35.33 70.67 106 141.34 212.01 353.35 706.7
3.5 2.55 5.11 10.22 15.33 25.55 51.09 76.64 102.19 153.28 255.47 510.95
4 1.94 3.87 7.74 11.62 19.36 38.72 58.08 77.45 116.17 193.62 387.23
4.5 1.52 3.04 6.08 9.12 15.19 30.39 45.58 60.77 91.16 151.93 303.86
5 1.22 2.45 4.9 7.35 12.25 24.49 36.74 48.99 73.48 122.47 244.93
5.5 1.01 2.02 4.03 6.05 10.08 20.17 30.25 40.34 60.51 100.85 201.7
10.11
Technical Data
10.11 49 Thermal Overload Protection
516 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019