Siemens 5SU9336-1CN32 RCBO 32A 30mA 3P C

The Siemens 5SU9336-1CN32 RCBO stands as a paramount protective device for modern electrical installations, combining residual current and overcurrent protection in a single, compact unit. This 3-pole, 32A, 30mA device with a Type C tripping characteristic offers superior safety, reliability, and space-saving efficiency, crucial for industrial and commercial applications demanding robust circuit protection. Its advanced technology ensures rapid fault detection and interruption, safeguarding personnel and equipment from electrical hazards.

Product Specifications

| Feature                 | Specification              |

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

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

| Manufacturer            | Siemens                    |

| Model Number            | 5SU9336-1CN32              |

| Number of Poles         | 3                          |

| Rated Current (In)      | 32 A                       |

| Rated Residual Current (IΔn) | 30 mA                      |

| Tripping Characteristic | Type C                     |

| Rated Voltage (Ue)      | 400 V AC                   |

| Frequency               | 50/60 Hz                   |

| Breaking Capacity (Icn) | 6 kA                       |

| Terminal Type           | Screw Terminals            |

| Mounting Type           | DIN Rail                   |

| Protection Class        | IP20                       |

| Ambient Temperature     | -25°C to +45°C             |

Core Features & Market Positioning

The Siemens 5SU9336-1CN32 distinguishes itself through its integrated design, a significant advantage over separate RCDs and MCBs, leading to reduced installation time and panel space. Its high breaking capacity of 6 kA ensures it can safely interrupt fault currents in demanding environments, offering a critical layer of safety and compliance with international standards. The Type C characteristic is specifically engineered to accommodate moderate inrush currents typical of inductive loads, such as motors and transformers, without nuisance tripping. This positions the 5SU9336-1CN32 as a preferred choice for robust industrial power distribution where reliability under varying load conditions is paramount.

Key Application Scenarios

This RCBO is ideally suited for protecting circuits in industrial manufacturing plants, commercial buildings, and distribution boards where personnel safety and equipment integrity are non-negotiable. Its 3-pole configuration makes it perfect for three-phase systems, commonly found in motor control circuits, HVAC systems, and power distribution units for machinery. The 30mA residual current sensitivity is essential for providing indirect contact protection, preventing electric shock in case of insulation faults, a critical requirement in wet or conductive environments. Applications include protecting circuits feeding pumps, compressors, machine tools, and lighting systems in factories and large commercial spaces.

Practical System Integration Guidance

Integrating the Siemens 5SU9336-1CN32 into existing electrical systems is straightforward due to its standard DIN rail mounting and readily accessible screw terminals. Ensure proper termination by firmly connecting the phase and neutral conductors to the designated input terminals and the outgoing load to the output terminals. For three-phase applications, ensure correct phasing to prevent operational issues. Before energizing, verify all connections are secure and that the ambient temperature is within the operational range of -25°C to +45°C. The device is designed for simple plug-and-play replacement of existing overcurrent protective devices when upgrading protection levels or ensuring compliance.

Operation and Risk Mitigation

The 5SU9336-1CN32 operates by continuously monitoring the current flowing through the protected circuit. If an imbalance occurs between the live and neutral conductors, indicating a leakage current to earth (a potential shock hazard), the residual current detection mechanism trips the breaker. Simultaneously, it provides overcurrent protection against short circuits and overloads. To mitigate risks, regular testing of the residual current function using the integrated test button is highly recommended. Refer to the product manual for specific test procedures and frequency. In the event of repeated tripping, a thorough inspection of the circuit for insulation faults or excessive load is necessary before resetting.

Scalability & Long-Term Value

As part of Siemens' comprehensive industrial control and protection portfolio, the 5SU9336-1CN32 offers excellent compatibility with other Siemens components, facilitating seamless integration into larger electrical systems and future upgrades. Its robust construction ensures a long service life, providing reliable protection for years. While this specific model is a standalone protective device, it can be incorporated into intelligent electrical networks where data on circuit status might be monitored remotely. The inherent reliability and adherence to stringent safety standards contribute significantly to the long-term operational value and reduced maintenance costs of the protected infrastructure.

Frequently Asked Questions

What is the primary function of the Siemens 5SU9336-1CN32 RCBO?

This RCBO integrates both residual current detection and overcurrent protection, safeguarding circuits from earth faults, short circuits, and overloads. It enhances safety by interrupting power flow swiftly in hazardous conditions.

How does the 30mA residual current rating benefit users?

The 30mA sensitivity is critical for providing effective protection against electric shock from indirect contact. It triggers rapidly when current leaks to earth, offering a vital safety layer for personnel.

What does the "Type C" tripping characteristic signify for this RCBO?

A Type C characteristic means the breaker is designed to tolerate moderate inrush currents typical of inductive loads, like motors, without nuisance tripping. This ensures operational reliability in industrial settings.

Can the Siemens 5SU9336-1CN32 be used in single-phase applications?

While this is a 3-pole device, it can be used to protect circuits in single-phase systems by leaving two poles vacant if the application requires. However, it is primarily designed for three-phase protection.

What is the breaking capacity of this RCBO?

The Siemens 5SU9336-1CN32 has a breaking capacity of 6 kA. This indicates its ability to safely interrupt fault currents up to 6000 Amperes without damage.

How do I test the residual current function of the 5SU9336-1CN32?

Regularly use the integrated test button on the front of the device. Pressing this button simulates a fault condition to verify the residual current protection is operational.

Is this RCBO suitable for outdoor installation?

No, this RCBO is rated IP20 and is designed for indoor installation in electrical enclosures or panels, protected from direct environmental exposure.

What is the maximum ambient temperature for operating this device?

The Siemens 5SU9336-1CN32 is rated for operation in ambient temperatures ranging from -25°C to +45°C.

How does this RCBO differ from a standard MCB?

An MCB only provides overcurrent protection (overload and short circuit). An RCBO adds residual current protection, crucial for preventing electric shocks.

Where is the ideal installation location for this 3-pole RCBO?

It is best installed in main distribution boards or sub-distribution boards protecting three-phase loads such as motors, pumps, or HVAC units in industrial and commercial facilities.