Siemens 5SU9336-1CN63 High Breaking Capacity RCBO 63A 30mA 3P C

The Siemens 5SU9336-1CN63 is a high-performance Residual Current Circuit Breaker with Overcurrent protection (RCBO) designed for robust electrical safety in demanding industrial environments. This 63A, 30mA, 3-pole unit offers superior protection against overcurrents, short circuits, and dangerous earth leakage currents, ensuring personnel safety and equipment integrity. Its key advantages lie in its high breaking capacity, precise tripping characteristics, and reliable Siemens engineering, making it a cornerstone for critical power distribution. Key technical parameters include a rated current of 63A, a rated residual operating current of 30mA, and a 3-pole configuration, all housed within a compact design for efficient panel space utilization.

Siemens 5SU9336-1CN63: Product Specifications

| Parameter                    | Specification                               |

| :--------------------------- | :------------------------------------------ |

| Product Type                 | RCBO (Residual Current Circuit Breaker with Overcurrent protection) |

| Rated Current (In)           | 63A                                         |

| Rated Residual Operating Current (IΔn) | 30mA                                        |

| Number of Poles              | 3P (3-pole)                                 |

| Breaking Capacity (Icn)      | 10 kA (IEC 60947-2 standard)                |

| Tripping Characteristic      | Type C                                      |

| Rated Voltage (Un)           | 400V AC                                     |

| Frequency                    | 50/60 Hz                                    |

| Protection Type              | Overcurrent, Short-circuit, Earth leakage   |

| Mounting Type                | DIN rail                                    |

| Operating Temperature Range  | -25°C to +45°C                              |

Core Features & Market Positioning

The Siemens 5SU9336-1CN63 stands out in the market due to its integration of residual current and overcurrent protection into a single device, significantly simplifying electrical installations and reducing component count. Its high breaking capacity of 10 kA ensures it can safely interrupt fault currents even in high-power distribution networks, a critical differentiator for industrial applications where such events are more common. The Type C tripping curve is optimized for inductive loads, providing excellent protection without nuisance tripping, a common concern in motor control and machinery environments. Siemens' reputation for reliability and advanced protection technology underpins its strong market position, offering end-users confidence in operational safety and system uptime. This RCBO is engineered to meet stringent international safety standards, positioning it as a premium solution for professional electrical installations.

Key Application Scenarios

This Siemens RCBO is ideally suited for a wide array of industrial and commercial applications where reliable protection against electrical hazards is paramount. It is frequently deployed in power distribution boards for manufacturing plants, protecting machinery and control systems from overloads, short circuits, and dangerous earth faults. In building management systems for large commercial complexes, it safeguards lighting circuits, HVAC systems, and general power outlets. For sectors with higher risk, such as chemical processing or data centers, the 30mA sensitivity offers crucial protection against electric shock for personnel working in proximity to electrical equipment. Its 3-pole configuration makes it suitable for three-phase power distribution, commonly found in industrial motor control centers and heavy machinery operations.

Practical System Integration Guidance

Integrating the Siemens 5SU9336-1CN63 RCBO into existing or new electrical systems is straightforward due to its standard DIN rail mounting and clear terminal designations. For a typical three-phase installation, the three line conductors (L1, L2, L3) are connected to the input terminals, and the corresponding outgoing conductors are connected to the output terminals. The neutral conductor is not typically switched by this 3-pole RCBO, but must be properly terminated in the distribution board. Ensure that the incoming conductors are rated for 63A and that the downstream wiring is appropriately sized for the protected circuits. Proper torque must be applied to the terminals to prevent loose connections, which can lead to overheating and failure. Always adhere to local electrical codes and regulations during installation.

Operation and Risk Mitigation

The Siemens 5SU9336-1CN63 operates by continuously monitoring the balance of current flowing through the protected conductors. If an imbalance occurs, indicating a current leakage to earth (a potential shock hazard), the device rapidly trips, interrupting the power supply. Similarly, it detects overcurrents and short circuits, providing essential protection against damage to equipment and preventing electrical fires. Risk mitigation is inherent in its design; the 30mA sensitivity is considered the threshold for preventing serious injury from electric shock. In the event of a fault, the operating handle will move to the "OFF" position. If the RCBO trips frequently without apparent external fault, it may indicate a persistent earth leakage issue in the protected circuit, requiring thorough investigation of connected appliances and wiring insulation.

Scalability & Long-Term Value

The Siemens 5SU9336-1CN63 RCBO offers significant long-term value through its compatibility with Siemens' broader range of industrial electrical components and systems. Its modular design allows for flexible panel configurations, and it can be easily replaced or supplemented as system requirements evolve. While this specific model is a standalone protection device, it integrates seamlessly into larger Siemens automation and power management platforms, supporting future upgrades to digital monitoring and control solutions. The robust construction and high-quality components ensure a long operational lifespan, minimizing the need for frequent replacements and reducing the total cost of ownership. Its adherence to international standards also guarantees ongoing compatibility with evolving electrical infrastructure.

Frequently Asked Questions (FAQs)

What is the breaking capacity of the Siemens 5SU9336-1CN63 RCBO?

The Siemens 5SU9336-1CN63 RCBO features a robust breaking capacity of 10 kA. This specification ensures it can safely interrupt and contain high fault currents, such as those from short circuits. It provides critical protection in industrial settings where fault levels can be substantial.

This high breaking capacity is crucial for preventing damage to the switchgear itself and downstream equipment during severe electrical events. It meets stringent IEC standards, offering reliable protection for critical infrastructure.

The 10 kA rating signifies the maximum fault current the device can safely interrupt without sustaining damage. This level of protection is essential for maintaining system integrity and operational safety in demanding applications.

What does the 'C' in Type C tripping characteristic mean for this RCBO?

The 'C' in the Siemens 5SU9336-1CN63 signifies a Type C tripping characteristic. This means the RCBO is designed to tolerate higher inrush currents without tripping. It is particularly suitable for inductive loads like motors and transformers.

Type C characteristics allow for magnetic tripping to occur between 5 to 10 times the rated current (In). This prevents nuisance tripping during normal motor start-up or other brief high-current events.

For applications with significant inductive loads, the Type C curve ensures reliable operation and protection. It strikes a balance between sensitivity to faults and tolerance for temporary overcurrents characteristic of these loads.

Can the Siemens 5SU9336-1CN63 RCBO protect against overvoltage?

No, the Siemens 5SU9336-1CN63 RCBO is not designed to protect against overvoltage conditions. Its primary functions are to protect against residual current (earth leakage) and overcurrents (overload and short-circuit).

Overvoltage protection typically requires separate devices like surge protective devices (SPDs). These SPDs divert excess voltage to earth, safeguarding sensitive equipment from transient overvoltages.

To ensure comprehensive protection, combine this RCBO with appropriate surge protection devices and consider the specific voltage risks present in your installation. Always consult system design guidelines for complete protection strategies.