Product Description
The Siemens 3RK1105-1BG04-2CA0 is a comprehensive motor starter designed for direct-on-line starting of three-phase asynchronous motors. This compact and robust device integrates overload protection, short-circuit protection, and a motor starter function into a single unit, optimizing panel space and reducing wiring complexity. It provides reliable motor control and protection, ensuring operational safety and minimizing downtime. The 3RK1105-1BG04-2CA0 features integrated diagnostics and communication capabilities, enabling seamless integration into automation systems for enhanced monitoring and control. This motor starter is suitable for a wide range of industrial applications, delivering efficient and dependable performance in demanding environments.
Is Your Device Showing These Signs?
The 3RK1105-1BG04-2CA0 is commonly repaired for issues including PROFIBUS communication failures stemming from damaged connectors or internal bus transceivers. Power supply malfunctions, often due to capacitor degradation or voltage regulator failure, are a frequent cause of unit inoperability. Tripping faults from overcurrent or short circuits in the load circuits necessitate investigation and repair of the output relays or solid-state switches. Firmware corruption, potentially induced by power surges or incomplete updates, requires reprogramming or replacement of the memory module. Component-level failures, such as optocouplers or microcontrollers, also contribute to the need for repair.
Technical specifications
The Siemens 3RK1105-1BG04-2CA0 is a compact, high-performance motor starter designed for direct-on-line starting of three-phase asynchronous motors up to 7.5 kW at 400V AC. This device integrates overload protection, short-circuit protection, and a motor starter function into a single, space-saving unit, reducing wiring effort and panel space requirements. It features adjustable overload settings for precise motor protection, preventing damage from overcurrent conditions. The integrated short-circuit protection ensures rapid disconnection in the event of a fault, safeguarding both the motor and the electrical system. Diagnostic LEDs provide clear status indication for operational state, overload, and short-circuit conditions, facilitating quick troubleshooting and maintenance. The 3RK1105-1BG04-2CA0 is equipped with screw terminals for secure and reliable electrical connections, and it is designed for easy installation on standard DIN rails. This motor starter complies with relevant IEC standards, ensuring safe and reliable operation in industrial environments. It is suitable for a wide range of applications, including pumps, fans, conveyors, and other machinery requiring direct-on-line starting. The robust design and comprehensive protection features of the 3RK1105-1BG04-2CA0 contribute to increased system uptime and reduced maintenance costs.
Our Repair Process for the
3RK1105-1BG04-2CA0
Our repair process for the 3RK1105-1BG04-2CA0 begins with a comprehensive diagnostic evaluation to pinpoint the failure. PROFIBUS communication issues are addressed through connector repair or replacement, and internal bus transceivers are repaired or replaced as needed. Power supply malfunctions are rectified by replacing degraded capacitors or faulty voltage regulators. Tripping faults are resolved by investigating and repairing output relays or solid-state switches. Firmware corruption necessitates reprogramming or memory module replacement. Component-level failures, including optocouplers and microcontrollers, are addressed through component replacement.
Your Guarantee: Warranty & Lifetime Support
Your satisfaction is our top priority, and we confidently stand behind the quality of our repairs. That's why every repair service is covered by our comprehensive 24-month warranty. Furthermore, we offer lifetime phone support – if you have questions or need assistance related to our repair down the road, we're here to help. Our service commitment is straightforward: we guarantee our work, and if you're not satisfied, we will make it right. Learn More about our Repair process.
Comprehensive Repairs You Can Depend On
We take immense pride in the quality and reliability of our work. Our process goes beyond simply fixing the immediate problem. We perform a comprehensive inspection of your main board (or other equipment) and proactively replace components known to be failure-prone or showing signs of potential future failure. Before any item is returned, it undergoes rigorous functional testing to ensure it meets performance specifications and operates flawlessly. Visit our main Repair Services page to learn more.
Save Significantly
Our primary goal is to save you hundreds, or even thousands, of dollars compared to the cost of new equipment replacement. By repairing existing components, we provide an economical solution that is also eco-friendly. At Roc Industrial, our commitment to integrity and community drives our consistent growth and ensures you receive a reliable, cost-effective solution.

Please Note: Roc Industrial operates as an independent service provider and is not an authorized distributor for the manufacturers or brands mentioned. Consequently, the original manufacturer's warranty is not applicable to items repaired or sold by us. Roc Industrial provides its own 2-year warranty on all repair services performed.

















