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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RA2120-1KD24-0BB4 |
| Alternative Part Number | 3RA21201KD240BB4 |
| Manufacturer | Siemens |
| Product Type | Non-fused load feeder |
| Size | S0 |
| Number of Poles | 3 |
| Installation Altitude | Up to 2,000 metres above sea level |
| Short Circuit Protection | Yes |
| Overload Protection | Yes |
| Phase Disturbance Recognition | Yes |
| Auxiliary Switch | Yes |
| Insulation Voltage | Rated at 690 V with degree of pollution 3 |
| Impulse Voltage Resistance | Rated at 6 kV |
| Protection Class | IP20 on the front |
| Electrical Shock Protection | Finger-safe |
| Operating Current | Rated at 32 A |
| Mechanical Operating Cycles | Typical 10,000,000 for auxiliary contacts |
| Operating Voltage | Rated at 690 V |
| Voltage Type | AC for main circuit |
| Service Power at AC-3 | 5,500 W at 400 V |
| Operating Current at AC-3 | 11.5 A at 400 V |
| Control Circuit Voltage Type | DC for auxiliary and control circuit |
| Holding Power of Solenoid | 5.9 W for DC |
| Number of Auxiliary Contacts | 1 NC contact and 1 NO contact |
| Overload Trip Class | CLASS 10 |
| Overload Release Design | Thermal (bimetallic) |
| Ambient Operating Temperature | -20 to +60 °C |
| Ambient Storage Temperature | -50 to +80 °C |
| Shock Resistance | 6g / 11 ms according to IEC 60068-2-27 |
| Mounting Type | For snapping onto 60 mm busbar systems |
| Dimensions (H x W x D) | 260 mm x 45 mm x 165 mm |
| Required Spacing | Various spacings required for safe installation, detailed in the datasheet |
| Type of Electrical Connection | Screw-type terminals for main current circuit |
| Connectable Conductor Cross-sections | 1 ... 10 mm² stranded, 2x (2.5 ... 6 mm²) for main contacts |
| Safety Related Data | B10 value with high demand rate according to SN 31920 |
| Certificates/Approvals | General Product Approval for use in hazardous locations and other certifications as specified |
The Siemens 3RA2120-1KD24-0BB4 is a robust and reliable load feeder designed for fuseless direct-on-line starting applications. This component is part of the esteemed SIRIUS product range and is engineered to facilitate seamless integration into busbar systems measuring 60mm. It is suitable for use in AC networks with a voltage of 400V and is capable of handling currents ranging from 9 to 12.5A, with a control supply voltage rated at 24V DC.
Constructed to deliver high performance, the 3RA2120-1KD24-0BB4 boasts an insulation voltage rated at 690V AC and is equipped with a surge voltage resistance of 6kV, ensuring durability and resilience in challenging industrial environments. The device's electromechanical switching contact design ensures reliable operation, and it comes with an adjustable current response value for the current-dependent overload release, enhancing its versatility across various applications.
The unit's mechanical service life is impressive, with the contactor rated for approximately 10 million switching cycles, indicating a long-lasting and cost-effective solution for industrial automation needs. Additionally, it meets the ATEX directive 2014/34/EU for protection in potentially explosive atmospheres, making it suitable for a wide range of sectors, including those with stringent safety requirements.
With a compact design that allows for vertical mounting and easy snapping onto busbar systems, the Siemens 3RA2120-1KD24-0BB4 is a practical choice for those seeking a direct starter that combines efficiency with a straightforward installation process. Its thermal (bimetallic) overload release with a trip class of CLASS 10 ensures protection against overloads, contributing to the overall safety and longevity of the system it is part of.
Overall, the Siemens 3RA2120-1KD24-0BB4 is a testament to Siemens' commitment to quality, reliability, and innovation in the field of industrial control and automation.
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Frequently Asked Questions
What is the size of the load feeder for this Siemens contactor?
The load feeder for this Siemens contactor is size S0.
Can this device be used for direct-on-line starting?
Yes, this Siemens contactor is designed for fuseless direct-on-line starting.
What is the insulation voltage rating for this contactor?
The insulation voltage rating for this contactor, with a degree of pollution 3, is 690 V AC.
What type of terminals does this contactor have?
This contactor is equipped with screw terminals.
Is there short circuit protection included in this contactor?
Yes, this contactor includes short circuit protection with a magnetic design for the short-circuit trip.
What is the operating voltage range for this contactor?
The operating voltage range for this contactor at AC-3 is up to a rated value of 690 V.
What are the ambient temperature limits for operating this contactor?
The ambient temperature range for operating this contactor is between -20°C to +60°C.
What is the rated control supply voltage for this device?
The rated control supply voltage for this device is 24 V DC.
Does this contactor come with an auxiliary switch?
Yes, this contactor can be extended with an auxiliary switch.
What is the protection class of the front side of this contactor?
The front side of this contactor has a protection class of IP20.
What is the mechanical service life of this contactor?
The mechanical service life of this contactor is typically 10 million switching cycles.
Can this contactor be mounted on a busbar system?
Yes, this contactor is designed for snapping onto 60 mm busbar systems.
What is the conditional short-circuit current rating of this contactor?
The conditional short-circuit current rating (Iq) at 400 V according to IEC 60947-4-1 is 150,000 A.
What is the trip class of the overload release for this contactor?
The overload release for this contactor is of trip class 10.
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