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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
15 kW r 3RT10 34
Overload relay
I
Setting range
= 32 A
e max
(at AC 50 Hz 400 V)
A
gL/gG
Size S2
5.5 ... 8
25
7 ... 10
32
9 ... 12.5
35
11 ... 16
40
14 ... 20
50
18 ... 25
63
22 ... 32
63
28 ... 40
63
36 ... 45
--
40 ... 50
--
Overload relay
30 kW r 3RT10 44
I
Setting range
= 65 A
e max
(at AC 50 Hz 400 V)
A
gL/gG
Size S3
18 ... 25
63
22 ... 32
80
28 ... 40
80
36 ... 50
125
45 ... 63
125
57 ... 75
--
70 ... 90
--
80 ... 100
--
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-ope-
rational after every short-circuit release.
Type of coordination "2": The contactor or the starter must be operatio-
nal after a short-circuit release (without replacement of parts). Welding of
the contacts is permissible however.
18.5 kW r 3RT10 35
I
= 40 A
e max
(at AC 50 Hz 400 V)
aM
BS 88
gL/gG
aM
10
25
25
10
16
32
32
16
16
35
35
16
20
40
40
20
25
50
50
25
32
63
63
32
35
63
63
35
50
63
63
50
--
--
63
50
--
--
--
--
37 kW r 3RT10 45
I
= 80 A
e max
(at AC 50 Hz 400 V)
aM
BS 88
gL/gG
aM
32
63
63
32
35
80
80
35
50
80
80
50
50
125
125
50
63
125
160
63
--
--
160
80
--
--
--
--
--
--
--
--
Overload Relays
3RU1 Thermal Overload Relays
3RU11 for standard applications
22 kW r 3RT10 36
I
= 50 A
e max
(at AC 50 Hz 400 V)
BS 88
gL/gG
aM
BS 88
25
25
10
25
32
32
16
32
35
35
16
35
40
40
20
40
50
50
25
50
63
63
32
63
63
80
35
80
63
80
50
80
80
80
50
80
--
80
50
80
45 kW r 3RT10 46
I
= 95 A
e max
(at AC 50 Hz 400 V)
BS 88
gL/gG
aM
BS 88
63
63
32
63
80
80
35
80
80
80
50
80
125
125
50
125
160
160
63
160
160
160
80
160
--
160
100
160
--
160
100
160
1)
UL-listed fuses
Motor starter protector
RK5
for starter
combinations at
I
= 50 kA/400 V AC
q
A
30
--
40
--
50
--
60
--
80
--
100
3RV13 31-4DC10
125
3RV13 31-4EC10
150
3RV13 31-4FC10
175
3RV13 31-4GC10
200
3RV13 31-4HC10
UL-listed fuses
Motor starter protector
RK5
for starter
combinations at
I
= 50 kA/400 V AC
q
A
100
--
125
--
150
--
200
--
250
3RV13 41-4JC10
300
3RV13 41-4KC10
350
3RV13 41-4LC10
350
3RV13 41-4MC10
Siemens · 2011
13
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