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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RT1045-1BB44 |
| Manufacturer | Siemens |
| Product Brand Name | SIRIUS |
| Product Designation | Power Contactor |
| Size of Contactor | S3 |
| Insulation Voltage | 1,000 V |
| Degree of Pollution | 3 |
| Surge Voltage Resistance | 6 kV |
| Maximum Permissible Voltage | 690 V (safe isolation between coil and main contacts acc. to EN 60947-1) |
| Protection Class (Front) | IP20 |
| Protection Class (Terminal) | IP00 |
| Shock Resistance (Rectangular Impulse) | 6.8g / 5 ms, 4g / 10 ms (DC) |
| Shock Resistance (Sine Pulse) | 10.6g / 5 ms, 6.2g / 10 ms (DC) |
| Mechanical Service Life | 10,000,000 switching cycles |
| Installation Altitude | Up to 2,000 m above sea level |
| Ambient Temperature (Operation) | -25 to +60 °C |
| Ambient Temperature (Storage) | -55 to +80 °C |
| Number of Poles (Main Circuit) | 3 |
| Number of NO Contacts (Main Circuit) | 3 |
| Number of NC Contacts (Main Circuit) | 0 |
| Operating Current (AC-1, 400 V) | 120 A (at 40 °C), 100 A (at 60 °C) |
| Operating Current (AC-3, 400 V) | 80 A |
| Operating Current (AC-4, 400 V) | 66 A |
| Service Power (AC-2, 400 V) | 37 kW |
| Service Power (AC-3, 400 V) | 37 kW |
| Control Supply Voltage | 24 V DC |
| Pull-in Power (DC) | 15 W |
| Holding Power (DC) | 15 W |
| Number of NC Contacts (Auxiliary) | 2 |
| Number of NO Contacts (Auxiliary) | 2 |
| Contact Reliability (Auxiliary) | 1 faulty switching per 100 million (17 V, 1 mA) |
| Operating Frequency (AC-1) | 900 operations/hour |
| Operating Frequency (AC-2) | 400 operations/hour |
| Operating Frequency (AC-3) | 1,000 operations/hour |
| Operating Frequency (AC-4) | 300 operations/hour |
| Thermal Short-time Current (10 s) | 760 A |
| No-load Switching Frequency (DC) | 1,000 operations/hour |
| Connectable Conductor Cross-section | 35 mm² (at 60 °C), 50 mm² (at 40 °C) |
| Ambient Conditions | Suitable for use in environments with a pollution degree of 3 |
| Application | Ideal for use in industrial control systems requiring reliable switching of high power loads. Suitable for applications in motor control, heating, lighting, and other electrical circuits. |
The Siemens 3RT1045-1BB44 is a robust and reliable power contactor designed for demanding industrial applications. This three-pole contactor is part of the SIRIUS range and is suitable for AC-3 applications, handling up to 80 A and 37 kW at 400 V. It operates on a 24 V DC control voltage, ensuring efficient and consistent performance.
Engineered for durability, the 3RT1045-1BB44 features a mechanical service life of up to 10 million switching cycles, making it ideal for high-frequency operations. The contactor is equipped with screw terminals for secure and straightforward installation, and it supports a variety of conductor cross-sections, including solid, stranded, and finely stranded wires.
With an insulation voltage rated at 1000 V and a surge voltage resistance of 6 kV, this contactor provides excellent protection and reliability in harsh environments. It is designed to operate within a wide ambient temperature range of -25 to +60 °C and can be installed at altitudes up to 2000 metres above sea level.
The Siemens 3RT1045-1BB44 also includes two normally open (NO) and two normally closed (NC) auxiliary contacts, enhancing its versatility for various control and signalling tasks. Its compact dimensions (146 mm height, 70 mm width, and 201 mm depth) allow for easy integration into control panels and systems.
This power contactor is an excellent choice for applications requiring high performance and reliability, such as motor control, heating, lighting, and other industrial automation tasks. Its robust construction and extensive operational capabilities make it a valuable component in any industrial setting.
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Frequently Asked Questions
What is the primary function of this Siemens power contactor?
The Siemens 3RT1045-1BB44 power contactor is designed for switching and controlling electric motors and other high-power loads in industrial applications.
What is the rated operational current for this contactor?
The Siemens 3RT1045-1BB44 power contactor has a rated operational current of 80 A for AC-3 applications at 400 V.
What type of voltage does the control supply voltage use?
The control supply voltage for the Siemens 3RT1045-1BB44 power contactor is 24 V DC.
How many poles does the main current circuit have?
The main current circuit of the Siemens 3RT1045-1BB44 power contactor has 3 poles.
What is the maximum installation altitude for this contactor?
The maximum installation altitude for the Siemens 3RT1045-1BB44 power contactor is 2,000 metres above sea level.
What is the mechanical service life of this contactor?
The Siemens 3RT1045-1BB44 power contactor has a typical mechanical service life of 10 million switching cycles.
What is the degree of protection for this contactor?
The Siemens 3RT1045-1BB44 power contactor has a protection class of IP20 on the front.
What is the rated power for AC-3 applications at 400 V?
The Siemens 3RT1045-1BB44 power contactor is rated for 37 kW in AC-3 applications at 400 V.
How many auxiliary contacts does this contactor have?
The Siemens 3RT1045-1BB44 power contactor is equipped with 2 normally open (NO) and 2 normally closed (NC) auxiliary contacts.
What is the rated insulation voltage of this contactor?
The rated insulation voltage of the Siemens 3RT1045-1BB44 power contactor is 1,000 V.
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