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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RT1044-1BB44 |
| Alternative Part Number | 3RT10441BB44 |
| Manufacturer | Siemens |
| Product Type | Power Contactor |
| Contact Configuration | 3 Normally Open (NO) |
| Rated Operational Current | AC-1: 100 A at 400 V, AC-3: 65 A at 400 V |
| Control Voltage | 24 V dc |
| Size | S3 |
| Connection Type | Screw Connection |
| Number of Auxiliary Contacts | 2 Normally Open (NO) + 2 Normally Closed (NC) |
| Insulation Voltage | Rated value: 1,000 V |
| Degree of Pollution | 3 |
| Surge Voltage Resistance | Rated value: 6 kV |
| Maximum Voltage for Safe Isolation | 690 V according to EN 60947-1 |
| Protection Class IP | IP20 on the front |
| Ambient Temperature | Operating: -25 … +60 °C |
| Mechanical Operating Cycles | Contactor: 10,000,000 typical |
| Installation Altitude | Maximum: 2,000 m above sea level |
| Dimensions (H x W x D) | 146 mm x 70 mm x 201 mm (approximate) |
The Siemens 3RT1044-1BB44 is a robust power contactor designed to handle high current applications with ease. This contactor is part of the SIRIUS product family, renowned for its reliability and performance in industrial environments. With a 3-pole configuration and a 24 V DC control supply voltage, it is well-suited for a variety of applications.
The 3RT1044-1BB44 features three normally open (NO) main contacts, ensuring efficient operation in AC-3 applications up to 65 A and 30 kW at 400 V. It also includes two normally open and two normally closed auxiliary contacts for additional circuit flexibility. The contactor is engineered to withstand challenging conditions, boasting an operational temperature range from -25°C to +60°C and an installation altitude of up to 2000 metres above sea level, making it a versatile choice for diverse settings.
Mechanical durability is a key strength of this contactor, with a mechanical service life of approximately 10 million switching cycles, ensuring longevity and reducing the need for frequent replacements. The screw terminal connection provides a secure and reliable means of installation, while the device's compact size, classified as size S3, allows for efficient use of space within control cabinets.
The 3RT1044-1BB44 is a phased-out product, and Siemens recommends the SIRIUS 3RT2 as its preferred successor. However, the enduring design and proven track record of the 3RT1044-1BB44 make it a valuable component for maintenance, repair, and operations (MRO) needs, as well as for systems where compatibility with existing equipment is essential.
This power contactor is an excellent choice for those seeking a dependable solution for controlling motors and loads in industrial automation, manufacturing, and other high-demand applications where consistent performance is critical.
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Frequently Asked Questions
What type of contactor is this Siemens power contactor?
This Siemens power contactor is a 3-pole contactor with 3 normally open (NO) main contacts, designed for AC-3 applications up to 30 kW at 400 V.
Can this contactor be used for DC applications?
Yes, the contactor is suitable for DC applications and comes with a control supply voltage of 24 V DC.
What is the rated operating current of this contactor at AC-1 and AC-3?
At AC-1, the rated operating current is 100 A at 400 V with a 40 °C ambient temperature. At AC-3, the rated operating current is 65 A at 400 V.
What is the mechanical service life of the contactor?
The mechanical service life of the contactor is typically 10 million switching cycles.
What is the maximum installation altitude for this contactor?
The maximum installation altitude for the contactor is 2,000 metres above sea level.
What are the ambient temperature limits for operating this contactor?
The contactor can operate within an ambient temperature range of -25 to +60 °C.
What is the insulation voltage rating of this contactor?
The insulation voltage rating of the contactor is 1,000 V.
What are the dimensions of this contactor for installation purposes?
The contactor has a width of 70 mm, a height of 146 mm, and a depth of 201 mm.
How can this contactor be mounted?
The contactor can be mounted using screw and snap-on mounting onto 35 mm and 75 mm standard mounting rails.
What is the protection class of the contactor?
The protection class on the front of the contactor is IP20.
