Siemens 5SU9346-1CN32 Industrial Grade Earth Leakage & Overload RCBO 32A 30mA 4P C

The Siemens 5SU9346-1CN32 is a robust, industrial-grade Earth Leakage and Overload RCBO designed for superior circuit protection in demanding environments. This 4-pole, 32A device, featuring a 30mA sensitivity and Type C tripping characteristic, offers indispensable safety and operational continuity. Its key advantages lie in its integrated protection against overload, short circuits, and earth leakage faults, simplifying installations and reducing component count. The 5SU9346-1CN32 is engineered for reliability, ensuring personnel safety and preventing equipment damage through its precise and rapid fault detection.

Product Specifications

| Feature                    | Specification                        |

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

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

| Manufacturer               | Siemens                               |

| Model Number               | 5SU9346-1CN32                         |

| Rated Current              | 32A                                   |

| Number of Poles            | 4P                                    |

| Rated Residual Operating Current | 30mA                                  |

| Tripping Characteristic    | Type C                                |

| Rated Voltage              | 400V AC                               |

| Frequency                  | 50/60 Hz                              |

| Breaking Capacity          | 6kA                                   |

| Insulation Voltage         | 500V                                  |

| Terminal Type              | Screw Terminals                       |

| Mounting Type              | DIN Rail                              |

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

| Protection Class           | IP20                                  |

Core Features & Market Positioning

The Siemens 5SU9346-1CN32 distinguishes itself through its comprehensive, all-in-one protection capabilities, consolidating the functions of a circuit breaker and an RCD into a single unit. This integration minimizes panel space and reduces installation complexity, a significant advantage in industrial settings where space is often at a premium. The Type C tripping characteristic is particularly suited for circuits with moderate inrush currents, such as those associated with motors and transformers, providing reliable protection without nuisance tripping. Its industrial-grade construction ensures durability and consistent performance under harsh operating conditions, positioning it as a dependable choice for critical infrastructure and manufacturing processes. The 30mA sensitivity is ideal for protecting both personnel from electric shock and preventing fires caused by earth leakage faults.

Key Application Scenarios

This RCBO is extensively deployed in industrial power distribution systems, safeguarding machinery and personnel. It is a critical component in manufacturing plants for protecting motor control circuits, conveyor systems, and processing equipment. In building services, the Siemens 5SU9346-1CN32 is utilized for main distribution boards and sub-distribution panels in commercial and industrial facilities, ensuring safety in areas with higher electrical load demands. Furthermore, its application extends to protecting sensitive electronic equipment in data centers and control rooms where reliable power and protection against transient faults are paramount. It is also commonly specified for HVAC systems and large pump installations requiring robust overcurrent and earth leakage protection.

Practical System Integration Guidance

Integrating the Siemens 5SU9346-1CN32 into existing or new electrical systems is straightforward due to its standard DIN rail mounting and familiar terminal configurations. Ensure that the incoming power supply (Line and Neutral for each pole) and outgoing load connections are correctly wired to the respective terminals. For 4-pole configurations, all three phases and the neutral conductor must be connected. Proper grounding of the protected circuit is essential for the effective operation of the earth leakage protection. Before energizing, verify all connections for tightness and correct phasing. It is crucial to adhere to local electrical codes and standards during installation to guarantee safety and compliance. The Type C characteristic means it is designed to handle inrush currents up to 5-10 times the rated current for short durations, which should be considered when sizing for motor loads.

Operation and Risk Mitigation

The 5SU9346-1CN32 operates by continuously monitoring the balance of current between the phase and neutral conductors. Any significant imbalance, indicating current leakage to earth, triggers the residual current device (RCD) function, rapidly disconnecting the circuit. Simultaneously, the integrated overcurrent protection monitors for excessive current due to overloads or short circuits, activating the circuit breaker function. This dual protection mechanism significantly mitigates risks of electric shock, fire, and equipment damage. In the event of a trip, identify the cause of the fault (e.g., insulation breakdown, equipment malfunction, or excessive load) before resetting the device. Avoid repeatedly resetting the RCBO without diagnosing the fault, as this can lead to further damage or hazardous conditions.

Scalability & Long-Term Value

As part of the broader Siemens SENTRON protection device portfolio, the 5SU9346-1CN32 offers excellent compatibility with other Siemens components and systems. This ensures straightforward scalability and integration within larger automation and control architectures. Its robust design guarantees a long service life, minimizing replacement costs and maintaining operational uptime. While not directly a digital device, its reliable performance contributes to the overall stability of electrical systems that may be part of an Industrial IoT (IIoT) infrastructure, indirectly supporting data integrity and predictive maintenance strategies by preventing unexpected outages. Its adherence to international standards ensures continued relevance and availability of compatible system upgrades.

Frequently Asked Questions

What is the primary function of the Siemens 5SU9346-1CN32 RCBO?

This device provides combined protection against earth leakage, overload, and short circuits. It ensures safety for personnel and equipment.

It integrates functions of an RCD and a miniature circuit breaker. This reduces component count and panel space.

The 30mA sensitivity detects dangerous leakage currents, preventing electric shock and fires. The 32A rating and Type C curve suit industrial loads.

How does the 30mA sensitivity of the 5SU9346-1CN32 protect users?

A 30mA residual current is considered the threshold for dangerous electric shock. This RCBO trips rapidly when such a current is detected.

It interrupts the circuit within milliseconds, minimizing the duration of current flow through a person. This significantly reduces the risk of severe injury or fatality.

This level of protection is vital for preventing secondary damage like fires caused by persistent low-level leakage. It meets stringent safety regulations.

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

Type C indicates the RCBO is designed for circuits with moderate inrush currents. These are common with inductive loads like motors and transformers.

It will tolerate inrush currents typically between 5 to 10 times its rated current for a short period. This prevents nuisance tripping during motor startup.

Choosing the correct tripping characteristic is crucial for reliable operation. Type C offers a good balance for many industrial applications with fluctuating loads.

Can the Siemens 5SU9346-1CN32 be used in residential applications?

While it offers superior protection, 30mA RCD protection is standard in modern residential installations. The 4-pole configuration is more common in industrial settings.

Its robust industrial-grade build is designed for harsher environments than typical homes. However, its protective functions are beneficial anywhere.

For residential use, a 2-pole or 4-pole RCBO with appropriate rating and sensitivity would be selected based on circuit requirements and local codes.

What is the breaking capacity of the 5SU9346-1CN32 and why is it important?

The 6kA breaking capacity means it can safely interrupt fault currents up to 6000 amperes. This rating is critical for system safety.

A higher breaking capacity ensures the device can safely handle and extinguish fault currents without being damaged. This prevents cascading failures.

This specification must be greater than or equal to the prospective short-circuit current at the point of installation. It ensures the RCBO can protect the downstream wiring.

How do I properly wire the Siemens 5SU9346-1CN32 RCBO?

Connect incoming power to the line terminals and outgoing load to the load terminals. For a 4-pole unit, all three phases and neutral require connection.

Ensure correct phase rotation and neutral connection to prevent damage and ensure proper operation. Refer to wiring diagrams for specific configurations.

Tighten all terminal screws securely to prevent loose connections, which can cause overheating and arcing, compromising safety and performance.

What troubleshooting steps should I take if the 5SU9346-1CN32 trips?

First, identify which protection function triggered the trip (overload, short circuit, or earth leakage). The trip mechanism usually indicates the cause.

Investigate the circuit for the fault. This may involve checking for damaged wiring, faulty appliances, or overloaded circuits.

Before resetting, ensure the fault condition has been resolved. If the RCBO trips repeatedly, consult a qualified electrician.

Is this RCBO compatible with other Siemens protection devices?

Yes, the 5SU9346-1CN32 is part of the Siemens SENTRON range. It offers excellent compatibility within this product family.

This allows for seamless integration into larger distribution boards and control panels using other Siemens components. It ensures a unified system.

Compatibility extends to accessories and related products, facilitating system upgrades and expansions with trusted Siemens components.

What is the difference between an RCBO and a standard circuit breaker or RCD?

A standard circuit breaker protects against overload and short circuits only. An RCD protects against earth leakage faults only.

An RCBO combines both functions into a single device. This provides comprehensive protection in one unit.

The RCBO offers space savings and simplified installation compared to using separate circuit breaker and RCD units for the same protection.

Can I use the 5SU9346-1CN32 for DC circuits?

No, this RCBO is designed and rated for AC (Alternating Current) circuits only. Using it on DC circuits can lead to malfunction and unsafe conditions.

Always ensure the voltage and current type match the device's specifications. AC devices are not suitable for DC applications.

Confirm the power source is indeed AC before installing this Siemens RCBO to maintain safety and operational integrity.