Siemens 5SU9336-1CN50 Industrial Equipment RCBO 50A 30mA 3P C

The Siemens 5SU9336-1CN50 is a high-performance Residual Current Circuit Breaker with Overcurrent protection (RCBO), engineered for demanding industrial environments. This 3-pole unit offers robust protection for electrical circuits, combining residual current detection and overcurrent tripping in a single, compact device. With a rated current of 50A, a sensitivity of 30mA, and a C-curve tripping characteristic, the 5SU9336-1CN50 is designed to safeguard personnel and equipment from electrical shocks, short circuits, and overloads, ensuring operational continuity and safety.

Product Specifications

| Feature                 | Specification                                |

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

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

| Manufacturer            | Siemens                                      |

| Model Number            | 5SU9336-1CN50                                |

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

| Rated Current (In)      | 50A                                          |

| Rated Residual Current  | 30mA                                         |

| Tripping Characteristic | C-curve                                      |

| Rated Voltage (Ue)      | 400V AC                                      |

| Frequency               | 50/60 Hz                                     |

| Breaking Capacity (Icn) | 10 kA                                        |

| Terminal Type           | Screw terminals                              |

| Mounting Type           | DIN rail                                     |

| Protection Class        | IP20 (device), IP40 (installed in enclosure) |

| Ambient Temperature     | -25°C to +55°C                               |

| Standards               | IEC/EN 61009-1, IEC/EN 60898-1, IEC/EN 60947-2 |

Core Features & Market Positioning

The Siemens 5SU9336-1CN50 stands out in the industrial protection market due to its integrated functionality, reducing installation complexity and panel space requirements. Its 3-pole design ensures comprehensive protection for three-phase systems, critical in many industrial applications. The C-curve characteristic provides reliable protection against overcurrents caused by motor inrush currents or other inductive loads without nuisance tripping. Siemens' reputation for quality and reliability underpins the 5SU9336-1CN50’s positioning as a premium solution for critical power distribution and control circuits where safety and uptime are paramount.

Key Application Scenarios

This RCBO is ideally suited for protecting circuits in industrial settings such as manufacturing plants, process control systems, and heavy machinery operations. Its application extends to motor circuits, lighting distribution boards, and power outlets where the risk of earth faults and overcurrents is significant. For example, it can be deployed in the control panels of automated production lines to safeguard motors and control electronics, or in electrical distribution systems for workshops and laboratories. The 30mA residual current sensitivity is particularly crucial for personnel protection against indirect contact.

Practical System Integration Guidance

Integrating the Siemens 5SU9336-1CN50 into an industrial electrical system involves straightforward installation on a standard 35mm DIN rail. Proper wiring is essential; the line conductors should be connected to the top terminals and the load conductors to the bottom terminals. For 3-pole operation, ensure all three poles are connected to the respective phase conductors. The residual current monitoring is inherent to the device, eliminating the need for separate residual current monitoring relays in many standard applications. Ensure compliance with local electrical codes and manufacturer guidelines during installation to guarantee optimal performance and safety.

Operation and Risk Mitigation

The Siemens 5SU9336-1CN50 operates by continuously monitoring the residual current between the phase conductors. If this residual current exceeds the 30mA threshold, indicating a potential earth fault or leakage current, the RCBO will trip, rapidly disconnecting the circuit and preventing electrical hazards. Similarly, it will trip if the current exceeds the overload or short-circuit thresholds defined by its C-curve characteristic. To mitigate risks, regular visual inspection and periodic testing of the RCBO's tripping function are recommended, typically using a dedicated test button or an external test device. Ensure that the circuit's load does not exceed the 50A rating.

Scalability & Long-Term Value

The 5SU9336-1CN50 integrates seamlessly into Siemens' broader industrial automation and electrical distribution portfolios, offering excellent compatibility with other SENTRON components. This ensures that electrical protection can be scaled and adapted as facility requirements evolve. While the RCBO itself is a fixed-rating device, its modular nature and compatibility with associated Siemens components allow for flexible system design and expansion. For enhanced digital integration, pairing this RCBO with intelligent power monitoring devices within a Siemens industrial control system can provide valuable data for predictive maintenance and energy management, contributing to long-term operational efficiency.

FAQs

What is the primary function of a Siemens 5SU9336-1CN50 RCBO?

The Siemens 5SU9336-1CN50 RCBO provides combined protection against overcurrents and residual currents. It safeguards electrical circuits from damage due to overloads and short circuits. Simultaneously, it protects people and equipment from electric shock hazards caused by earth faults.

How does the 30mA sensitivity of this RCBO benefit industrial safety?

A 30mA residual current sensitivity is critical for protecting personnel from dangerous electric shocks. This sensitivity ensures rapid disconnection when leakage current reaches a level that could be harmful. It is a key safety feature for preventing indirect contact with live parts.

What does the 'C-curve' tripping characteristic mean for the 5SU9336-1CN50?

The C-curve designation indicates the RCBO's response to overcurrents, particularly in circuits with inductive loads. It allows for higher inrush currents, common with motors, without tripping. This characteristic prevents nuisance tripping while still providing protection against short circuits.

Can the Siemens 5SU9336-1CN50 be used in single-phase applications?

No, the Siemens 5SU9336-1CN50 is a 3-pole (3P) RCBO. It is designed for three-phase electrical systems. For single-phase applications, a 1-pole or 2-pole RCBO would be required, depending on the specific wiring configuration.

What is the breaking capacity of the Siemens 5SU9336-1CN50?

The Siemens 5SU9336-1CN50 has a breaking capacity of 10 kA (kiloamperes). This indicates its ability to safely interrupt fault currents up to this level without sustaining damage. It is a crucial parameter for ensuring reliable protection in industrial fault conditions.

How should I wire the Siemens 5SU9336-1CN50 in a three-phase system?

For a three-phase system, connect each of the three incoming phase conductors to the corresponding top terminals of the 5SU9336-1CN50. Then, connect the outgoing phase conductors supplying the load to the respective bottom terminals. Ensure correct phasing to maintain system integrity.

What are the environmental operating limits for this industrial RCBO?

The Siemens 5SU9336-1CN50 is designed to operate within an ambient temperature range of -25°C to +55°C. It is important to ensure the installation environment stays within these limits for optimal performance and longevity of the device.

Is the Siemens 5SU9336-1CN50 compatible with other Siemens SENTRON components?

Yes, the 5SU9336-1CN50 is part of the Siemens SENTRON protection device family. It is designed for seamless integration with other SENTRON components, enabling scalable and consistent electrical distribution solutions.

How often should the tripping function of the 5SU9336-1CN50 be tested?

It is recommended to periodically test the tripping function of the RCBO, often monthly or quarterly, using the integrated test button. Regular testing ensures that the residual current detection and tripping mechanism are functioning correctly, maintaining safety levels.

What is the IP protection rating of the Siemens 5SU9336-1CN50?

The Siemens 5SU9336-1CN50 has an IP20 protection rating for the device itself, meaning it is protected against solid objects larger than 12.5mm. When installed within a suitable enclosure, it can achieve an IP40 rating, providing further protection against dust and accidental contact.