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Specification & Description
| Specification | Description |
|---|---|
| Part Number | 3RA1120-4BD26-0AP0 |
| Alternative Part Number | 3RA11204BD260AP0 |
| Manufacturer | Siemens |
| Product Brand Name | SIRIUS |
| Product Designation | Non-fused load feeder |
| Design | Direct starter |
| Size | S0 |
| Protection Class IP | IP20 |
| Degree of Pollution | 3 |
| Insulation Voltage (Rated Value) | 690 V |
| Installation Altitude (Max) | 2,000 m above sea level |
| Ambient Temperature (Operating) | -20 to +70 °C |
| Ambient Temperature (Storage) | -55 to +80 °C |
| Shock Resistance | 12.5g |
| Impulse Voltage Resistance (Rated) | 6 kV |
| Reference Code | Q (according to DIN EN 61346-2) |
| Mechanical Operating Cycles | 10,000,000 (of the contactor) |
| Short Circuit Protection | Yes, with circuit-breakers |
| Breaking Capacity (Icu at 400 V) | 50 kA |
| Mounting Position | ±90° rotatable, ±22.5° tiltable forwards and backwards |
| Mounting Type | For snapping onto 60 mm busbar systems |
| Dimensions (W x H x D) | 45 mm x 183 mm x 148 mm |
| Centre Line Spacing | 60 mm |
| Electrical Connection | Screw-type terminals |
| Conductor Cross-Section (Main Contacts) | 1 ... 6 mm² (solid, stranded, finely stranded with conductor end processing) |
| Conductor Cross-Section (AWG Conductors) | 2x (14 ... 10) |
| Verification of Suitability | UL, CSA, CCC, GL, LRS, BV, DNV, PRS |
| Load Feeder Type | Fuseless direct starting, AC 400V |
| Motor Protection Type | Bimetal |
| Adjustable Response Current | 14 … 20 A |
| Operating Voltage (AC-3, Max) | 400 V |
| Operating Current (AC-3 at 400 V) | 15.5 A |
| Service Power (AC-3 at 400 V) | 7.5 kW |
| Off-load Operating Frequency | 15 1/s |
| Control Feed Voltage Type | AC |
| Control Supply Voltage Frequency | 50 Hz (rated value) |
| Control Supply Voltage (at 50 Hz) | 230 V (rated value) |
| Auxiliary Switch | Yes |
| Digital Inputs | 0 |
The Siemens 3RA1120-4BD26-0AP0 is a robust and efficient non-fused load feeder designed for direct starting applications. This component is part of the SIRIUS product family, renowned for its reliability and versatility in various industrial settings. With a size S0 footprint, it is engineered to facilitate seamless integration into electrical systems.
This load feeder operates at an AC voltage of 400V and is suitable for use with a 230V AC control supply voltage at 50Hz. It features a screw connection on a 60mm busbar adapter, ensuring a secure and stable connection. The device is designed to handle a current range of 14 to 20 A, making it suitable for a wide range of motor protection applications.
The 3RA1120-4BD26-0AP0 boasts an electromechanical switching contact and bimetal motor protection, providing reliable performance and protection for connected motors. It has a three-pole design for the main current circuit and is capable of operating at a rated current of 15.5 A at AC-3, with a service power of 7.5 kW at 400V.
For added flexibility, the load feeder includes an auxiliary switch and is designed to withstand a short-circuit breaking capacity limit of 50 kA at 400V. Its robust construction ensures a high degree of shock resistance and an impulse voltage resistance rated at 6 kV.
The product is designed with safety in mind, featuring an IP20 protection class on the front and a degree of pollution of 3. It can be installed at altitudes up to 2,000 meters above sea level and operates within a temperature range of -20 to +70°C, making it suitable for a variety of environmental conditions.
With a compact design, the Siemens 3RA1120-4BD26-0AP0 measures 45mm in width, 183mm in height, and 148mm in depth, allowing for efficient use of space within electrical cabinets. It is designed for mounting onto 60mm busbar systems and can be rotated +/-90° or tilted +/-22.5° for optimal installation flexibility.
The load feeder's electrical connections are designed for screw-type terminals, accommodating a range of conductor cross-sections for solid, stranded, or finely stranded wires, ensuring compatibility with various wiring standards.
Overall, the Siemens 3RA1120-4BD26-0AP0 is a dependable and high-performing solution for direct motor starting applications, offering ease of installation, comprehensive protection features, and a design that meets the demands of modern industrial environments.
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Frequently Asked Questions
What is the design of the switching contact for this Siemens load feeder?
The switching contact of this Siemens load feeder is electromechanical, providing reliable operation for direct starting applications.
Can you describe the motor protection type used in this load feeder?
The motor protection for this load feeder is of the bimetal type, which offers adjustable response current for current-dependent overload release.
What is the operating voltage and current rating for this device?
The operating voltage at AC-3 is rated at a maximum of 400V, and the operating current at AC-3 at 400V is rated at 15.5A.
What are the main circuit specifications for this load feeder?
The main circuit of the 3RA1120-4BD26-0AP0 has 3 poles for the main current circuit, and it is designed to handle a service power at AC-3 at 400V with a rated value of 7.5kW.
What type of control supply voltage is required for this device?
This device requires an AC control supply voltage, with a rated frequency of 50Hz and a rated value of 230V at 50Hz for AC.
Does this Siemens load feeder come with auxiliary switches?
Yes, the product extension includes auxiliary switches, although it does not specify the number of NC, NO, or changeover contacts for auxiliary contacts.
What is the breaking capacity limit for short-circuit current?
The breaking capacity limit for short-circuit current (lcu) at 400V is rated at 50kA.
What are the mounting options for this load feeder?
The load feeder is designed for snapping onto 60 mm busbar systems and can be mounted in various positions, including vertical with a rotation of +/-90° and tilting of +/-22.5°.
What are the dimensions and mounting requirements for this device?
The dimensions are 45mm in width, 183mm in height, and 148mm in depth, with a center line spacing of 60mm. There are specific distances to be maintained from earthed parts and conductive elements for safe installation.
What types of electrical connections are supported for the main current circuit?
The electrical connection for the main current circuit is a screw-type terminal, compatible with various conductor cross-sections including solid, stranded, and finely stranded with conductor end processing.
