Siemens 3RT20261KB40 — S0 Size 3-Pole DC Coil Contactor
Panel Placement and Function
A contactor of the S0 size class typically occupies a defined cell in a motor-control or power-distribution panel. The 3RT20261KB40 is a Siemens 3RT2 series three-pole contactor with 24 VDC coil, rated 25 A continuous, and integral 1NO/1NC auxiliary contacts. It mounts via chassis or DIN rail and is packaged in bulk.
Contact and Coil Characteristics
Main Contact Ratings
The three main poles present a 3PST-NO (3 Form A) arrangement. Continuous current rating is 25 A. The contact form describes the main pole configuration only; auxiliary contact state is stated separately as 1NO/1NC.
DC Coil Data
| Parameter | Value |
|---|---|
| Coil Voltage | 24 VDC |
| Coil Power | 4.5 W |
| Coil Current | 187.5 mA |
| Coil Resistance | 128 Ω |
| Must Operate Voltage | 16.8 VDC |
Operate time, release time, and ambient temperature range are not listed in this catalog record.
In-Catalog Comparison Rows
The following entries share the same base product number (3RT2026) and 25 A / 3-pole / DIN-rail profile. All carry 1NO/1NC auxiliary contacts unless noted. These are catalog screening peers; they are not OEM-endorsed substitutes. All require the reader's own qualification.
| MPN | Coil Voltage | Coil Power | Must Operate | Contact Form | Encapsulation |
|---|---|---|---|---|---|
| 3RT20261KB40 (primary) | 24 VDC | 4.5 W | 16.8 VDC | 3PST-NO | Bulk |
| 3RT20261BB40 | 24 VDC | 5.9 W | 19.2 VDC | 3PST-NO | Bulk |
| 3RT20261DB40 | 24 VDC | 5.9 W | 19.2 VDC | 3PST-NO | Box |
| 3RT20261FB40 | 24 VDC | 5.9 W | 19.2 VDC | 3PST-NO | Box |
Why 3RT20261BB40 Is Catalog-Adjacent
Shares the same 24 VDC coil and 25 A / 3-pole main contact arrangement. Coil power is listed as 5.9 W versus 4.5 W, and must-operate voltage is 19.2 VDC versus 16.8 VDC in the primary record.
Why 3RT20261DB40 Is Catalog-Adjacent
Same base product, voltage class, current rating, and auxiliary contact configuration. Differs in encapsulation (Box vs Bulk) and coil power dissipation.
Why 3RT20261FB40 Is Catalog-Adjacent
Matches 3RT20261DB40 on all shared spec keys; appears in the same boxed form factor within the series.
Other Voltage Variants in the 3RT2026 Family
The following also share the 3RT2026 base and 25 A / 3-pole / auxiliary contact profile but differ in coil voltage. One variant carries a different auxiliary count and is flagged.
| MPN | Coil Voltage | Must Operate | Aux Config |
|---|---|---|---|
| 3RT20261BA40 | 12 VDC | 9.6 VDC | 1NO/1NC |
| 3RT20261BD40 | 42 VDC | 33.6 VDC | 1NO/1NC |
| 3RT20261BE40 | 60 VDC | 48 VDC | 1NO/1NC |
| 3RT20261BM40 | 220 VDC | 176 VDC | 1NO/1NC |
| 3RT20261BB44 | 24 VDC | 19.2 VDC | 2NO/2NC |
The 3RT20261BB44 entry carries 2NO/2NC auxiliary contacts, which changes the contactor logic profile relative to the 1NO/1NC primary.