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Overload Relays
3RU1 Thermal Overload Relays
3RU11 for standard applications
Short-circuit protection with fuses/motor starter protectors for motor feeders
With short-circuit currents up to 100 kA at rated operational voltages up to AC 50/60 Hz 690 V
Permissible short-circuit protection fuse for motor starters comprising overload relay and contactor, type of coordination 2
3 kW r 3RT10 15
Overload relay
I
Setting range
= 7 A
e max
(at AC 50 Hz 400 V)
A
gL/gG
Size S00
0.11 ... 0.16
0.5
0.14 ... 0.2
1
0.18 ... 0.25
1
0.22 ... 0.32
1.6
0.28 ... 0.4
2
0.35 ... 0.5
2
0.45 ... 0.63
2
0.55 ... 0.8
4
0.7 ... 1
4
0.9 ... 1.25
4
1.1 ... 1.6
6
1.4 ... 2
6
1.8 ... 2.5
10
2.2 ... 3.2
10
2.8 ... 4
16
3.5 ... 5
20
4.5 ... 6.3
20
5.5 ... 8
20
7 ... 10
--
9 ... 12
--
5.5 kW r 3RT10 24
Overload relay
I
Setting range
= 12 A
e max
(at AC 50 Hz 400 V)
A
gL/gG
Size S0
1.8 ... 2.5
10
2.2 ... 3.2
10
2.8 ... 4
16
3.5 ... 5
20
4.5 ... 6.3
20
5.5 ... 8
25
7 ... 10
25
9 ... 12.5
25
11 ... 16
25
14 ... 20
--
17 ... 22
--
20 ... 25
--
1)
For type of coordination "1"
see short-circuit protection of the
contactors without overload relay under "Controls - Contactors
and Contactor Assemblies".
1) Assignment and short-circuit protective devices according to
IEC 60947-4-1:
The contactor or starter must not endanger persons or the installation in the
event of a short-circuit.
Type of coordination "1": The contactor or the starter may be non-operati-
onal after every short-circuit release.
Type of coordination "2": The contactor or the starter must be operational
after a short-circuit release (without replacement of parts). Welding of the
contacts is permissible however.
2) At max. 415 V.
12
Siemens · 2011
4 kW r 3RT10 16
I
= 9 A
e max
(at AC 50 Hz 400 V)
aM
BS 88
gL/gG
aM
--
--
0.5
--
--
--
1
--
--
--
1
--
--
2
1.6
--
--
2
2
--
--
2
2
--
--
4
2
--
--
4
4
--
--
6
4
--
--
6
4
--
--
10
6
--
--
10
6
--
--
10
10
--
--
16
10
--
--
16
16
--
6
20
20
6
6
20
20
6
10
20
20
10
--
--
20
16
--
--
--
--
7.5 kW r 3RT10 25
I
= 17 A
e max
(at AC 50 Hz 400 V)
aM
BS 88
gL/gG
aM
–
10
10
–
–
16
10
–
–
16
16
–
6
20
20
6
6
25
20
6
2)
10
25/32
25
10
2)
16
25/32
25
16
2)
20
25/32
25
20
2)
20
25/32
25
20
--
--
25
20
--
--
--
--
--
--
--
--
5.5 kW r 3RT10 17
I
= 12 A
e max
(at AC 50 Hz 400 V)
BS 88
gL/gG
aM
BS 88
–
0.5
–
–
–
1
–
–
–
1
–
–
2
1.6
–
2
2
2
–
2
2
2
–
2
4
2
–
4
4
4
–
4
6
4
–
6
6
4
–
6
10
6
–
10
10
6
–
10
10
10
–
10
16
10
–
16
16
16
–
16
20
20
6
20
20
20
6
20
20
20
10
20
20
20
16
20
--
20
16
25
11 kW r 3RT10 26
I
= 25 A
e max
(at AC 50 Hz 400 V )
BS 88
gL/gG
aM
BS 88
10
10
–
10
16
10
–
16
16
16
–
16
20
20
6
20
25
20
6
25
2)
25/32
25
10
32
2)
25/32
32
16
35
2)
25/32
35
20
35
2)
25/32
35
20
35
2)
25/32
35
20
35
--
35
20
35
--
35
20
35
1)
UL-listed fuses
Motor starter protector
RK5
for starter
combinations at
I
= 50 kA/400 V AC
q
A
1
--
1
3RV13 21-0BC10
1
3RV13 21-0CC10
1
3RV13 21-0DC10
1.6
3RV13 21-0EC10
2
3RV13 21-0FC10
2.5
3RV13 21-0GC10
3
3RV13 21-0HC10
4
3RV13 21-0JC10
5
3RV13 21-0KC10
6
3RV13 21-1AC10
8
3RV13 21-1BC10
10
--
12
--
16
--
20
--
25
--
30
--
40
--
45
--
UL-listed fuses
Motor starter protector
RK5
for starter
combinations at
I
= 50 kA/400 V AC
q
A
10
3RV13 21-1CC10
12
3RV13 21-1DC10
16
3RV13 21-1EC10
20
3RV13 21-1FC10
25
3RV13 21-1GC10
30
3RV13 21-1HC10
40
3RV13 21-1JC10
45
3RV13 21-1KC10
60
3RV13 21-4AC10
80
3RV13 21-4BC10
80
3RV13 21-4CC10
100
--
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