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Siemens 3RT1045-1BB44

Name: 3RT1045-1BB44
Brand: Siemens
SKU: 3RT1045-1BB44
Price: 110.71 GBP
Availability: InStock

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£110.71 (ex. VAT)

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Marvo Stock ID MV-2G5S

HS Code 85364900

SKU 3RT1045-1BB44

Condition Used

Warranty 12 months

Weight (kg) 4.00

Length (mm) 320.00

Width (mm) 250.00

Height (mm) 250.00

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Specification & Description

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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.

Commonly Asked Questions

Is my order covered by a warranty?

Marvo provides a full 12-month warranty on all products, whatever the condition. For your peace of mind, all parts are ‘Marvo Approved’ which means that they have been tested and checked to ensure that they are in working condition. If you are unhappy with the part(s) you received and would like to request a return, you can do so by completing our quick and easy online form. Once we have received your Returns Request, a member of the team will be in touch to discuss this further with you. You can read more about our warranty policy here.

What payment methods do you accept?

We accept card payments from all major credit, debit and Mastercard providers including Visa, American Express, Western Union, Paypal and bank transfers. Before you complete an order you will be prompted to input your payment details, at which point you can enter the relevant card information you wish to use for your transaction. If you are experiencing issues with your payment method then you can contact our team via email here. From there, you will be directed to the most relevant resource or person to help you complete your payment, get your order processed and ensure that your parts are on the way to your delivery address.

Is Marvo a credible parts supplier?

Marvo is a highly credible supplier of industrial automation parts and components with dedicated hubs around the world offering industry-leading products and services. Marvo is committed to providing a quick, easy and reliable place to source your automation and control components. All purchases come as standard with a comprehensive 12-month return to base warranty meaning that, in just a few clicks, you can source critical parts more seamlessly than ever before. Click here to read an article on how Marvo is redefining convenience for automation and manufacturing professionals.

Have steps been taken to ensure quality control?

Marvo takes pride in product quality and has put several measures in place to assure high levels of quality standards. For your peace of mind, all parts have been ‘Marvo Approved’ which means that they have been tested and checked to ensure that they are in working condition. Redefine convenience and secure priority delivery on all parts along with a comprehensive 12-month warranty. This is the smart new way to buy automation and control components.

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Our service to you

Lightning-Fast Express Shipping: Receive your order in record time with our express shipping options, ensuring you minimize downtime and keep your projects on track.

No-Risk Returns, Guaranteed: Return your parts anytime for a full refund. Our hassle-free return policy ensures you’re never stuck with something you don’t need.

Clear Pricing with No Hidden Fees: What you see is what you pay, transparent pricing with no extra costs, ever. Rest assured, all taxes and fees are already included in your final price.

Rock-Solid Reliability at a Fraction of the Cost: Get pre-owned electronic parts that are fully tested for peak performance, saving you money without compromising on quality, backed by a comprehensive warranty.

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.

Part conditions explained

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New unsealed: The product is in its original packaging, but the packaging has been opened or unsealed. It has never been used and should be in near pristine condition.

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New unboxed: The product does not come in its original packaging, but it has never been used and is in great working condition.

Refurbished: The product has been previously used, but it has undergone a thorough refurbishment process to restore it to a like-new or functional condition. Any defects or issues have been addressed, making it suitable for reuse.

Used: The product has been previously owned and has been used. It may show signs of wear and tear but is still functional and operational. The condition may vary depending on the specific item and its usage history.

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