With a 24 V DC coil and a motor rating of 11 kW at 400 V, the Siemens 3RT2026-1BB44 is the size S0 member of the SIRIUS 3RT2 contactor range for 25 A AC-3 duty. It has 2 NO + 2 NC integrated auxiliary contacts, and Siemens rates it at 40 A for resistive (AC-1) loads at 40 °C. At 230 V the AC-3 motor rating is 5.5 kW.
A contactor is the switching element of a motor starter: the PLC or a push-button energises the coil, and the main contacts connect the motor to the supply. Contactors wear with every start, so they are among the most frequently replaced parts in motor control centres.
See our Siemens industrial controls range, including SIRIUS 3RU2 overload relays and 3RV2 motor starter protectors for the same size.
Technical data
| Siemens order number | 3RT2026-1BB44 |
|---|---|
| Product | SIRIUS 3RT2 power contactor, 3-pole |
| Size | S0 |
| Utilisation category | AC-3 / AC-3e |
| Rated operational current AC-3 at 400 V | 25 A |
| Motor power AC-3 at 400 V | 11 kW |
| Motor power AC-3 at 230 V | 5.5 kW |
| Operational current AC-1 (40 °C, up to 690 V) | 40 A |
| Rated operating voltage, max. | 690 V |
| Coil voltage | 24 V DC |
| Coil operating range | 0.8 … 1.1 x Us |
| Coil pick-up power | 5.9 W |
| Coil holding power | 5.9 W |
| Auxiliary contacts (integrated) | 2 NO + 2 NC |
| Closing delay | 50 … 170 ms |
| Opening delay | 15 … 18 ms |
| Mechanical service life, typ. | 10,000,000 operating cycles |
| Power loss per pole (rated current) | 1.9 W |
| Short-circuit protection, main circuit (type 1) | gG: 100 A (690 V, 100 kA), aM: 50 A (690 V, 100 kA), BS88: 100 A (415 V, 80 |
| Ambient temperature (operation) | -25 … +60 °C |
| Connection type | screw-type terminals |
| Mounting | screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715 |
| Dimensions (W x H x D) | 45 x 85 x 151 mm |
| Net weight | 0.647 kg |
| Condition | New, original Siemens |
Typical applications
- Switching heaters and resistive loads (AC-1)
- Star-delta starter assemblies
- Conveyor, mixer and packaging machine drives
- Pump, fan and compressor control panels
Compatibility and replacement
For overload protection mount a SIRIUS 3RU2 thermal overload relay of size S0 directly under the contactor, or combine it with a 3RV2 motor starter protector of the same size using the Siemens link module. Older 3RT10 contactors were replaced by the 3RT20 series; send us the old order number and we will confirm the current equivalent.
Frequently asked questions
What coil voltage does it need?
Per Siemens: 24 V DC, operating range 0.8 … 1.1 x Us.
How many auxiliary contacts does it have?
It has 2 NO + 2 NC integrated; more can be added with 3RH2911 auxiliary switch blocks.
Do you ship to my country, and what is the warranty?
Yes. RendatSP ships worldwide from Yiwu, China, by air in 5 to 7 days once the part is ready, and every part carries a 1-year warranty. Send the order number and quantity on WhatsApp and we will reply with a quotation.
Before you order
Compare the complete order number on the old unit with this page, including the suffix: in most ranges the last characters set the coil voltage, current range or version. If the label is worn, send us a photo and we will identify the part.
RendatSP ships from Yiwu, China, to factories worldwide; air delivery usually takes 5 to 7 days once the part is ready. The part is new and original with a 1-year warranty (shipping, payment and warranty). For a quotation, message us on WhatsApp with the order number and quantity. We also have agents in Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
