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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RT1044-1AC20 |
| Alternative Part Number | 3RT10441AC20 |
| Manufacturer | Siemens |
| Product Type | Power Contactor |
| Poles | 3 Pole |
| Contact Configuration | 3P-3NO (3 Main Contacts, Normally Open) |
| Rated Operational Voltage | 400 V |
| Rated Current | 100 A |
| Power Rating | 30 kW |
| Contactor Size | Size S3 |
| Insulation Voltage | Rated at 1,000 V |
| Degree of Pollution | 3 |
| Surge Voltage Resistance | Rated value 6 kV |
| Maximum Operating Altitude | 2,000 m above sea level |
| Ambient Operating Temperature | -25 … +60 °C |
| Mechanical Operating Cycles | 10,000,000 typical for contactor |
| Number of NC Contacts | 0 for main contacts |
| Number of NO Contacts | 3 for main contacts |
| Operating Current at AC-1 | 100 A at 400 V (40 °C ambient temperature) |
| Operating Current at AC-3 | 65 A at 400 V |
| Operating Current at AC-4 | 55 A at 400 V |
| Control Circuit Voltage Type | AC |
| Control Supply Voltage | 24 V AC at 50/60 Hz |
| Apparent Pull-in Power | 247 V·A for AC |
| Apparent Holding Power | 25 V·A for AC |
| Protection Class IP | IP20 on the front |
| Connection Type | Screw Connection |
| Commodity Code | 853649 |
The Siemens 3RT1044-1AC20 is a robust power contactor designed to handle high switching capacities efficiently and reliably. This three-pole contactor is part of the SIRIUS product range and is engineered to facilitate the control of motor loads or power circuits in a variety of industrial applications.
With a rated operational current of 100 A at AC-1 and 65 A at AC-3, this contactor can manage AC-3 motor loads up to 30 kW at 400 V, making it suitable for a wide range of demanding tasks. The contactor operates with a control supply voltage of 24 V AC at 50/60 Hz and features screw connection terminals for secure and straightforward installation.
The device is designed with a size S3 footprint, ensuring it can be accommodated within standard industrial control panels without occupying excessive space. It also boasts an impressive mechanical service life, capable of up to 10 million operating cycles, which speaks to its durability and the potential for long-term operation.
The 3RT1044-1AC20 is constructed to maintain performance within a broad range of ambient temperatures, from -25°C to +60°C, and at installation altitudes of up to 2000 metres above sea level, ensuring reliability across various environmental conditions.
This contactor is a testament to Siemens' commitment to quality and performance in industrial control components, offering a dependable solution for those seeking to enhance their system's efficiency and operational longevity.
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Frequently Asked Questions
What are the main characteristics of this power contactor?
This power contactor is a 3-pole device with 3 normally open (NO) contacts, suitable for AC-3 applications up to 30 kW at 400 V. It has a rated operating current of 65 A at AC-3 and 100 A at AC-1, with a control supply voltage of 24 V AC at 50/60 Hz. It's designed for screw terminal connections and is part of the SIRIUS product family.
Can this contactor be used for high-frequency switching applications?
The contactor is designed for a variety of applications but has a maximum operating frequency of 1000 operations per hour at AC-1, which may not be suitable for high-frequency switching. It's best to check the specific requirements of your application against the contactor's rated operating frequency.
What is the insulation voltage rating for this contactor?
The insulation voltage rating for this contactor is 1000 V, which is the rated value for ensuring safe operation under the specified conditions.
What is the size and mounting type for this contactor?
The contactor is of size S3 and can be mounted by screw and snap-on mounting onto 35 mm and 75 mm standard mounting rails. It allows for side-by-side mounting as well.
What are the ambient temperature limits for operating this contactor?
The contactor can operate within an ambient temperature range of -25 to +60 degrees Celsius, ensuring reliable performance across a wide range of environmental conditions.
What type of protection does the contactor offer?
The contactor offers a protection class of IP20 on the front, which means it is protected against solid objects larger than 12.5 mm but not against water. The terminal protection class is IP00.
How does the contactor handle short-circuit protection?
For short-circuit protection of the main circuit, a fuse with a gL/gG characteristic of 250 A for type of coordination 1 or 125 A for type of coordination 2 is required. For the auxiliary switch, a 10 A fuse is needed.
What is the mechanical service life of this contactor?
The mechanical service life of the 3RT1044-1AC20 contactor is typically 10 million operating cycles, which contributes to its durability and longevity in various applications.
Can this contactor be used with both AC and DC control circuits?
This contactor is designed for AC control circuits with a control supply voltage of 24 V AC at 50/60 Hz. It is not specified for DC control circuits.
What are the dimensions of this contactor?
The dimensions of the contactor are 70 mm in width, 146 mm in height, and 139 mm in depth, making it compact enough for installation in various industrial settings.
