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Overload Relays
General data
Overload relay
Type
3RU11 thermal overload relays
3RU11 1
3RU11 2
3RU11 3
3RU11 4
1)
3RB20
solid-state overload relays
3RB20 1
3RB20 2
3RB20 3
3RB20 4
3RB20 5
3RB20 6
3RB20 1 +
3UF18
1)
3RB21
solid-state overload relays
3RB21 1
3RB21 2
3RB21 3
3RB21 4
3RB21 5
3RB21 6
3RB21 1 +
3UF18
1)
3RB22/3RB23
solid-state overload relays
3RB22/3RB23 + 3RB29 5
When using the overload relays with trip class ≥ CLASS 20, see "Technical
1)
specifications", "Short-Circuit Protection with Fuses for Motor Feeders",
and the Configuration Manual „SIRIUS Configuration - Selection data for
Fuseless Load Feeders", Order No. 3ZX1012-0RA21-0AC0"
or as a PDF file on the Internet at
http://support.automation.siemens.com/WW/view/en/40625241
Connection methods
The 3RB20 and 3RB21 relays are available with screw terminals
(box terminals) or spring-type terminals on the auxiliary current
side; the same applies for the evaluation modules of the
3RB22/3RB23 relays.
The 3RU11 relays come with screw terminals.
Screw terminals (box terminals)
Spring-type terminals
These connections are indicated in the Technical
specifications by orange backgrounds.
6
Siemens · 2011
Current
Current
Contactors (type, size, rating in kW)
measure-
range
3RT10 1
ment
S00
Type
A
3/4/5.5
✔
Integrated
0.11 ... 12
Integrated
1.8 ... 25
--
Integrated
5.5 ... 50
--
Integrated
18 ... 100
--
✔
Integrated
0.1 ... 12
Integrated
0.1 ... 25
--
Integrated
6 ... 50
--
Integrated
12.5 ... 100
--
Integrated
50 ... 200
--
Integrated
55 ... 630
--
Integrated
630 ... 820
--
✔
Integrated
0.1 ... 12
Integrated
0.1 ... 25
--
Integrated
6 ... 50
--
Integrated
12.5 ... 100
--
Integrated
50 ... 200
--
Integrated
55 ... 630
--
Integrated
630 ... 820
--
✔
3RB29 0
0.3 ... 25
3RB29 0
10 ... 100
--
20 ... 200
--
3RB29 6
63 ... 630
--
3RB29 0 +
630 ... 820
--
3UF18
3RT10 2
3RT10 3
3RT10 4
3RT10 5
S0
S2
S3
S6
5.5/7.5/11 15/18.5/22 30/37/45
55/75/90
--
--
--
✔
--
--
✔
--
--
✔
--
--
--
--
--
✔
--
--
✔
--
--
✔
--
--
--
--
--
--
--
--
--
--
--
--
--
--
✔
--
--
✔
--
--
✔
--
--
--
--
--
--
--
--
--
--
--
✔
--
--
✔
✔
--
--
--
--
--
--
--
--
--
--
3RT10 6
3RT10 7
3TF68/69
S10
S12
Size 14
110/132/160 200/250
375/450
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
✔
--
--
✔
✔
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
✔
--
--
✔
✔
--
--
--
--
--
--
--
--
--
--
✔
--
--
✔
✔
--
--
--
--
--
--
--
--
--
--
--
--
--
✔
✔
--
--
--
--
--
✔
✔
--
--
--
✔
✔
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