Siemens 5SU9336-1CN40 High Current RCBO 40A 30mA 3P C
The Siemens 5SU9336-1CN40 is a high-performance Residual Current Circuit Breaker with Overcurrent protection (RCBO), engineered for robust safety and reliable operation in demanding industrial environments. This 40A, 3-pole unit with a 30mA residual current sensitivity and C-curve tripping characteristic is designed to provide comprehensive protection against earth faults, short circuits, and overloads. Its advanced design ensures immediate disconnection, safeguarding personnel and equipment from electrical hazards. Key advantages include its high breaking capacity, compact modular design for space efficiency in control panels, and superior tripping reliability even under challenging conditions. Technical parameters highlight its suitability for demanding power distribution applications where safety and uptime are paramount.
| Specification | Value |
| :------------------------ | :--------------------------------------- |
| Product Type | RCBO (Residual Current Circuit Breaker with Overcurrent protection) |
| Manufacturer | Siemens |
| Model Number | 5SU9336-1CN40 |
| Rated Current (In) | 40A |
| Number of Poles | 3-Pole |
| Residual Current (IΔn) | 30mA |
| Tripping Curve | C Curve |
| Rated Voltage (Ue) | 400V AC |
| Rated Breaking Capacity (Icn) | 6 kA |
| Frequency | 50/60 Hz |
| Terminal Type | Screw Terminals |
| Mounting Type | DIN Rail |
| Ambient Temperature Range | -25°C to +45°C |
| Protection Class | IP20 (enclosure), IP40 (terminal block) |
Core Features & Market Positioning
The Siemens 5SU9336-1CN40 stands out in the market due to its integrated approach to circuit protection, combining residual current and overcurrent functions into a single, space-saving device. This dual functionality simplifies panel design and installation while reducing component count. The C-curve tripping characteristic is specifically tailored for industrial applications where inrush currents are common, such as motor start-ups, without causing nuisance tripping. Siemens' reputation for engineering excellence and product longevity further solidifies the 5SU9336-1CN40's position as a premium solution for critical electrical installations demanding utmost reliability and safety. Its robust construction ensures sustained performance even in harsh operating environments, a key differentiator for industrial-grade equipment.
Key Application Scenarios
This 40A 3-pole RCBO is ideally suited for protecting power circuits in industrial facilities, including manufacturing plants, processing industries, and large commercial buildings. It is particularly effective in safeguarding machinery, pumps, motors, and distribution boards where higher current loads and potential for earth leakage exist. The 30mA sensitivity makes it an excellent choice for personnel protection against indirect contact in areas with increased electrical risk. Common use cases include main incomer protection for sub-distribution boards, protection of circuits supplying inductive loads, and ensuring compliance with electrical safety regulations in demanding environments. The 5SU9336-1CN40 is a robust solution for ensuring operational continuity and safety across a wide spectrum of industrial power distribution needs.
Practical System Integration Guidance
Integrating the Siemens 5SU9336-1CN40 into existing or new electrical systems is straightforward, leveraging standard DIN rail mounting and familiar terminal connections. For wiring, ensure that all three live conductors and the neutral conductor (if applicable to the system configuration) are correctly terminated into the respective line and load terminals, adhering to the marked polarity. Proper grounding of the system is essential for the RCBO's earth-fault protection to function effectively. When connecting to downstream loads, ensure the total connected load does not exceed the 40A rating. For applications involving sensitive electronic equipment, consider the potential for electromagnetic interference and ensure appropriate shielding or filtering is in place to maintain optimal RCBO performance. Always consult the official Siemens installation manual for detailed wiring diagrams and safety precautions relevant to your specific application and local electrical codes.
Operation and Risk Mitigation
The Siemens 5SU9336-1CN40 operates by continuously monitoring the current flowing through the protected conductors. If an imbalance is detected, indicating a current leak to earth exceeding the 30mA threshold, the residual current detection mechanism triggers an immediate trip. Simultaneously, the overcurrent protection elements monitor for excessive current due to overloads or short circuits, tripping the device accordingly. Risk mitigation is inherent in its design, providing crucial protection against electric shock and fire hazards. In the event of a trip, the cause must be identified and rectified before resetting the device. Common troubleshooting involves checking for insulation faults in connected equipment, verifying correct wiring, and confirming that the connected load is within the RCBO's rated capacity. There are no specific fault codes; trips are indicated by the device's toggle position.
Scalability & Long-Term Value
The Siemens 5SU9336-1CN40 offers significant long-term value through its compatibility with the broader Siemens industrial control and automation ecosystem. Its modular design allows for easy replacement or addition of protective devices within standard switchgear assemblies, facilitating system upgrades or modifications. While not directly IIoT-enabled in terms of communication protocols, its reliable performance contributes to the overall stability of an industrial power system, which can be integrated into digital monitoring frameworks through external sensing and control systems. This ensures that critical protection remains in place as facilities evolve, minimizing downtime and safeguarding investments. The product's robust build quality also ensures a long operational lifespan, reducing the need for premature replacements and contributing to cost-effectiveness.
FAQs
What is a Siemens 5SU9336-1CN40 RCBO?
This RCBO is a 3-pole, 40A device offering protection against earth faults. It has a 30mA sensitivity and a C-curve for industrial loads.
What is the tripping characteristic of the Siemens 5SU9336-1CN40?
The C-curve tripping characteristic is designed for circuits with higher inrush currents. This prevents nuisance tripping from motor start-ups.
Can the Siemens 5SU9336-1CN40 be used for single-phase applications?
No, this is a 3-pole device intended for 3-phase power systems. A single-pole version would be required for single-phase protection.
What is the breaking capacity of the 5SU9336-1CN40?
The breaking capacity (Icn) is 6 kA. This indicates the maximum fault current it can safely interrupt.
What does 30mA residual current sensitivity mean?
A 30mA sensitivity means the device will trip when it detects a leakage current of 30 milliamperes to earth. This is crucial for personal safety.
How do I install the Siemens 5SU9336-1CN40?
It mounts on a standard DIN rail. Ensure correct wiring of the three live conductors and neutral to the designated terminals.
What type of loads is the Siemens 5SU9336-1CN40 suitable for?
It is suitable for industrial loads, including motors, pumps, and lighting circuits, where overcurrent and earth faults need protection.
What is the rated current of this RCBO?
The rated current (In) for the Siemens 5SU9336-1CN40 is 40 amperes. This is the maximum continuous current it can carry.
When should I choose a C-curve breaker?
A C-curve is recommended for circuits with higher inductive loads or inrush currents, such as motor control circuits.
What safety precautions should I take when working with this product?
Always de-energize the circuit before installation or maintenance. Follow all local electrical codes and safety guidelines.
