Overload Relays General data 1) When using the overload relays with trip class CLASS 20, see "Technical specifications", "Short-Circuit Protection with Fuses for Motor Feeders", and the project planning aid "Configuring SIRIUS Fuseless Load Fee- ders". 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.
7 Siemens · 2009 Overload relay Type Overload relay Current measure- ment Current range Contactors (type, size, rating in kW) 3RT10 1 3RT10 2 3RT10 3 3RT10 4 3RT10 5 3RT10 6 3RT10 7 3TF68/69 Type S00 A 3/4/5.5 S0 5.5/7.5/11 S2 15/18.5/22 S3 30/37/45 S6 55/75/90 S10 110/132/160 S12 200/250 Size 14 375/450 3RU11 thermal overload relays 3RU11 1 3RU11 2 3RU11 3 3RU11 4 3RU11 1 Integrated 0.11 … 12 ✔ -- -- -- -- -- -- -- Integrated 1.8 … 25 -- ✔ -- -- -- -- -- -- 3RU11 3 Integrated 5.5 … 50 -- -- ✔ -- -- -- -- -- Integrated 18 … 100 -- -- -- ✔ -- -- -- -- 3RB201) solid-state overload relays 3RB20 1 3RB20 2 3RB20 3 3RB20 4 3RB20 5 3RB20 6 3RB20 1 + 3UF18 3RB20 1 Integrated 0.1 …
12 ✔ -- -- -- -- -- -- -- Integrated 0.1 … 25 -- ✔ -- -- -- -- -- -- 3RB20 3 Integrated 6 … 50 -- -- ✔ -- -- -- -- -- Integrated 12.5 … 100 -- -- -- ✔ -- -- -- -- 3RB20 5 Integrated 50 ... 200 -- -- -- -- ✔ -- -- -- Integrated 55 ... 630 -- -- -- -- -- ✔ ✔ ✔ 3RB20 1 + 3UF18 Integrated 630 ... 820 -- -- -- -- -- -- -- ✔ 3RB211) solid-state overload relays 3RB21 1 3RB21 2 3RB21 3 3RB21 4 3RB21 5 3RB21 6 3RB21 1 + 3UF18 3RB21 1 Integrated 0.1 … 12 ✔ -- -- -- -- -- -- -- Integrated 0.1 … 25 -- ✔ -- -- -- -- -- -- 3RB21 3 Integrated 6 … 50 -- -- ✔ -- -- -- -- -- Integrated 12.5 … 100 -- -- -- ✔ -- -- -- -- 3RB21 5 Integrated 50 ... 200 -- -- -- -- ✔ -- -- -- Integrated 55 ...
630 -- -- -- -- -- ✔ ✔ ✔ 3RB21 1 + 3UF18 Integrated 630 ... 820 -- -- -- -- -- -- -- ✔ 3RB22/3RB231) solid-state overload relays 3RB29 0 0.3 … 25 ✔ ✔ -- -- -- -- -- -- 3RB29 0 10 ... 100 -- -- ✔ ✔ -- -- -- -- 3RB22/3RB23 + 3RB29 5 20 … 200 -- -- -- -- ✔ -- -- -- 3RB29 6 63 ... 630 -- -- -- -- -- ✔ ✔ ✔ 3RB29 0 + 3UF18 630 ... 820 -- -- -- -- -- -- -- ✔