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2026-10-08
Industrial automation systems often depend on reliable motor switching components to keep production lines, pumps, fans, compressors, and machine tools operating safely and efficiently. For maintenance teams working with existing Siemens control cabinets, the Siemens 3RT1024-1BB40 SIRIUS 3RT10 contactor remains a relevant spare-part option for equipment already designed around this component.
The 3RT1024-1BB40 is a three-pole Siemens SIRIUS power contactor with a 24V DC control coil, designed for motor switching applications. According to Siemens technical documentation, the contactor is rated for 12 A at AC-3 and 400 V, with a motor rating of 5.5 kW at 400 V. It uses a Size S0 design and screw terminals.
For customers maintaining existing industrial equipment, sourcing the correct original part number can help reduce unnecessary control-panel modifications and simplify like-for-like replacement.
The 3RT1024-1BB40 SIRIUS 3RT10 contactor is intended for switching electrical loads and motors in industrial control systems. Its 24V DC control voltage makes it suitable for control architectures where PLCs, relay outputs, or other 24V DC control circuits operate contactors.
The main contacts are configured as 3 normally open power contacts, while the contactor provides a compact S0 form factor for installation in industrial control cabinets. Siemens documentation specifies an operating ambient temperature range of approximately -25°C to +60°C and a typical mechanical service life of up to 10 million operating cycles, depending on configuration.
Siemens SIRIUS 3RT10 power contactor
Part number: 3RT1024-1BB40
24V DC control coil
3-pole main contact configuration
Size S0
AC-3 rated current: 12 A at 400 V
Motor rating: 5.5 kW at 400 V
Screw terminal connection
Front protection class: IP20
Suitable for industrial motor switching and control applications
Designed for maintenance and replacement of existing SIRIUS installations
| Parameter | Specification |
|---|---|
| Manufacturer | Siemens |
| Product family | SIRIUS 3RT10 |
| Part number | 3RT1024-1BB40 |
| Contactor type | Power contactor |
| Number of poles | 3 |
| Contactor size | S0 |
| Control voltage | 24V DC |
| AC-3 operating current | 12 A at 400 V |
| AC-1 operating current | 40 A at 400 V |
| Motor rating | 5.5 kW at 400 V |
| Main contacts | 3 NO |
| Connection | Screw terminals |
| Front protection | IP20 |
| Operating temperature | -25°C to +60°C |
| Typical mechanical life | Up to 10 million cycles |
The technical data above is based on Siemens documentation and historical product datasheets for the 3RT1024-1BB40.
The Siemens 3RT1024-1BB40 can be found in control systems where a 24V DC control signal is used to switch motors or other electrical loads. Typical maintenance applications may include:
Motor starter control panels
Pump control systems
Industrial fans and ventilation equipment
Conveyor and material-handling machinery
Compressor systems
Packaging machinery
Machine tools
Factory automation equipment
Industrial electrical cabinets
Replacement of aging SIRIUS contactors
For maintenance engineers, automation integrators, OEM service teams, and industrial spare-parts distributors, identifying the exact Siemens part number is particularly important when replacing a component in an existing cabinet.
Replacing an industrial contactor is not simply a matter of selecting a component with a similar current rating. Control voltage, number of poles, utilization category, contact configuration, physical size, connection method, and the existing control-panel design should all be checked before installation.
For this reason, customers searching for Siemens 3RT1024-1BB40, 3RT1024-1BB40 24V DC contactor, or SIRIUS 3RT10 contactor should compare the complete part number with the component installed in their equipment.
This is especially important for older automation systems where a direct replacement may be preferable to redesigning the entire motor-control circuit.
Siemens currently lists the 3RT1024-1BB40 as an end-of-lifecycle product, with the catalog indicating that the product is no longer available through the standard Siemens catalog and identifying SIRIUS 3RT2 as the successor family.
This makes the original 3RT1024-1BB40 particularly relevant to customers maintaining existing machinery rather than designing a completely new system. Industrial plants can have equipment with long service lives, and maintaining the original configuration can sometimes be more practical than immediately replacing an entire control assembly.
When purchasing a replacement, customers should verify the exact electrical and mechanical requirements and confirm whether the original component or a current successor is appropriate for their application.
Industrial automation equipment is used worldwide, and maintenance teams may need to source discontinued or hard-to-find Siemens components for production lines operating in Europe, North America, South America, Asia, the Middle East, and other industrial markets.
CXY Trade provides industrial automation spare parts for international customers, supporting maintenance departments, system integrators, machine builders, distributors, and industrial equipment users looking for Siemens automation components.
For customers specifically searching for the Siemens 3RT1024-1BB40 24V DC contactor, please refer to the product page for current availability and purchasing information.
What is the Siemens 3RT1024-1BB40?
The Siemens 3RT1024-1BB40 is a SIRIUS 3RT10 three-pole power contactor with a 24V DC control coil. It is rated at 12 A for AC-3 operation at 400 V and 5.5 kW at 400 V.
What is the coil voltage of the 3RT1024-1BB40?
The rated control supply voltage is 24V DC. This makes it suitable for industrial control circuits using a 24V DC control supply.
What motor power is supported by the 3RT1024-1BB40?
The Siemens technical data specifies 5.5 kW at 400 V under AC-3 utilization. The actual application must always be checked against the motor, load, protection, and system requirements.
Is the 3RT1024-1BB40 still a current Siemens product?
Siemens lists the 3RT1024-1BB40 as an end-of-lifecycle product and indicates SIRIUS 3RT2 as the successor family. This makes the original part particularly relevant for replacement and maintenance of existing equipment.
Who may need a Siemens 3RT1024-1BB40 replacement?
Maintenance engineers, industrial automation distributors, OEM service teams, system integrators, and factories maintaining existing Siemens SIRIUS control systems may need this exact part number for repair or replacement projects.
The Siemens 3RT1024-1BB40 SIRIUS 3RT10 24V DC contactor is a useful reference part for industrial maintenance and replacement projects involving existing Siemens motor-control systems. With its three-pole configuration, 24V DC coil, 12A AC-3 rating, and 5.5 kW motor rating at 400 V, it can be matched to existing applications where the original component is still required.
For international buyers searching for 3RT1024-1BB40, Siemens SIRIUS 3RT10 contactor, Siemens 24V DC contactor, or replacement parts for existing industrial automation equipment, verifying the complete part number and technical requirements is essential before ordering.
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