The Siemens 3RT1044-1BB40 is a SIRIUS 3RT1 series power contactor designed for controlling three-phase motors and other high-power loads. It features a 3-pole configuration with 3 Normally Open (NO) main contacts, a 24 V DC coil, and screw terminals. Rated for 65 A in AC-3 (motor load) and 30 kW at 400 V, it belongs to the Size S3 frame, making it a robust solution for demanding industrial motor control applications.
Item No :
3RT1044-1BB40Order(MOQ) :
1Payment :
EXWProduct Origin :
GermanyShipping Port :
Wuhan, Hubei, ChinaLead Time :
3-5 daysWeight :
2.834kgOverview
3RT1044-1BB40 SIMATIC PLC Module
New in stock
Origin from Germany
Payment Method: TT.Western Union
Shipping Method: DHL\UPS\Fedex\EMS\Others
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| Part Number | Description | Key Difference |
|---|---|---|
| 3RT1044-1BB40 | S3, 65 A, 24 V DC (this item) | Discontinued; remaining stock |
| 3RT2037-1KB40 | Successor – SIRIUS 3RT2, 65 A, 24 V DC | Preferred replacement model |
| 3RT1044-1AB00 | S3, 65 A, 24 V AC coil | AC coil variant |
| 3RT1044-1BB40 | S3, 65 A, 24 V DC | Standard model |
| 3RU1146 | Thermal Overload Relay | Required for motor overload protection |
Replacement Note: When migrating to the successor 3RT2037-1KB40, verify that the S3 frame dimensions and terminal arrangement are compatible with your existing panel layout. The 3RT2 series is the current SIRIUS platform, but it may require minor wiring adjustments compared to the 3RT1.
1 × Siemens 3RT1044-1BB40 SIRIUS 3RT1 Power Contactor
Note: Auxiliary contacts, overload relay, and DIN rail are sold separately.
In Stock – Ready to ship immediately
Tested – Each unit verified for functionality
Warranty Included – 12-month warranty for purchase confidence
Technical Support – Contactor and successor migration assistance available
Q1: What is the Siemens 3RT1044-1BB40?
It is a SIRIUS 3RT1 power contactor with 3 poles, 3 NO main contacts, and a 24 V DC coil. It is rated for 65 A in AC-3 and 30 kW at 400 V, in the Size S3 frame with screw terminals.
Q2: Is this product still in production?
No. It was discontinued effective October 1, 2020 (PM490 status). It is available only through remaining stock, refurbished units, or third-party suppliers .
Q3: What is the successor model?
The preferred successor is 3RT2037-1KB40 from the SIRIUS 3RT2 series .
Q4: What is the coil voltage?
The coil is rated for 24 V DC .
Q5: What is the motor power rating?
The contactor is rated for 30 kW at 400 V in AC-3 (motor load) and 100 A in AC-1 (resistive load) .
Q6: How many auxiliary contacts does it have?
The basic unit has no integrated auxiliary contacts (0 NO + 0 NC). Auxiliary contact blocks can be added up to a maximum of 8 blocks (with no more than 4 NC) .
Q7: What are the dimensions and weight?
Approximately 70 × 146 × 152 mm and 2.77–2.83 kg .
Q8: Does this contactor include overload protection?
No. A separate overload relay (such as the 3RU1146 series) must be installed in the motor feeder for overload protection.
Q9: What is the operating temperature range?
The operating range is -25 to +60 °C .
Q10: What should I verify before ordering?
Always verify the exact part number (3RT1044-1BB40), confirm your motor current and power requirements (65 A AC-3 / 30 kW at 400 V), ensure your control voltage is 24 V DC, and check whether you should migrate to the successor 3RT2037-1KB40 for new installations.
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