Siemens 5SU9336-1CN06 Small Current Circuit RCBO 6A 30mA 3P C

The Siemens 5SU9336-1CN06 is a compact Residual Current Circuit Breaker with Overcurrent Protection (RCBO) designed for robust electrical safety in demanding industrial and commercial environments. This 3-pole, 6A, 30mA device offers superior protection against overcurrents and earth leakage faults, ensuring personnel safety and equipment integrity. Its key advantages lie in its space-saving design, advanced tripping characteristics, and seamless integration into modern electrical distribution systems, making it a preferred choice for critical applications requiring reliable fault detection and interruption. The inherent C-curve tripping characteristic provides robust protection against inrush currents common in industrial machinery, while the 30mA residual current sensitivity is ideal for preventing electric shock hazards.

Siemens 5SU9336-1CN06: Product Specifications

| Feature                  | Specification                               |

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

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

| Manufacturer             | Siemens                                     |

| Series                   | 5SU9                                        |

| Rated Current (In)       | 6A                                          |

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

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

| Tripping Characteristic  | C-Curve                                     |

| Rated Breaking Capacity (Icn) | 10kA                                        |

| Rated Voltage (Un)       | 400V AC                                     |

| Frequency                | 50/60 Hz                                    |

| Insulation Voltage (Ui)  | 500V AC                                     |

| Degree of Protection     | IP20 (terminal), IP40 (enclosure)           |

| Terminal Type            | Screw Terminals                             |

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

| Mounting Type            | DIN Rail                                    |

Core Features & Market Positioning

The Siemens 5SU9336-1CN06 stands out in the market due to its high breaking capacity of 10kA, ensuring it can safely interrupt fault currents even in high-demand industrial settings. Its unified design, combining circuit breaker and RCD functions in a single unit, significantly reduces panel space requirements and simplifies installation, a crucial advantage for system integrators and panel builders. The C-curve tripping characteristic is specifically engineered to tolerate temporary overcurrents from inductive loads, such as motors and transformers, without nuisance tripping, thereby enhancing operational reliability. This positioning as a compact, high-performance protective device makes it ideal for applications where space is at a premium but uncompromising safety and reliability are paramount. The product benefits from Siemens' extensive experience in industrial electrical components, assuring users of its quality and longevity.

Key Application Scenarios

This RCBO is ideally suited for protecting circuits in three-phase industrial machinery, motor control centers, and distribution boards where both overcurrent and residual current protection are mandated. It is particularly effective in commercial buildings, manufacturing plants, and data centers where reliable power distribution and personnel safety are critical. The 30mA sensitivity is crucial for preventing electric shock in areas with increased risk, such as workshops, laboratories, and facilities housing sensitive electronic equipment. Its robust construction and specific tripping characteristics make it a sound choice for circuits supplying inductive loads, minimizing unnecessary downtime.

Practical System Integration Guidance

Integrating the Siemens 5SU9336-1CN06 into an existing electrical system is straightforward due to its standard DIN rail mounting and familiar terminal layout. Ensure the main power supply lines are correctly connected to the line side terminals (typically at the top) and the loads are connected to the load side terminals (typically at the bottom). For proper residual current detection, the phase conductors and the neutral conductor (if applicable for the system and device configuration) must pass through the RCBO. Always ensure that the upstream protective device (e.g., main breaker) has a rated current and breaking capacity that is coordinated with the 5SU9336-1CN06 to guarantee selective protection. Verify that all connections are torqued to the manufacturer's specifications to prevent overheating and ensure reliable operation.

Operation and Risk Mitigation

The Siemens 5SU9336-1CN06 operates by continuously monitoring the current balance between the phase conductors. If an imbalance exceeding 30mA occurs, indicating a potential earth leakage fault, the device rapidly trips, interrupting the circuit and preventing hazardous situations like electric shock or fire. In the event of an overcurrent fault (overload or short circuit), the integrated thermal or magnetic tripping mechanism activates, also isolating the circuit. To mitigate operational risks, always ensure the RCBO is correctly rated for the circuit's load and that the upstream protection is appropriately selected. Regular testing of the residual current function using the integrated test button is crucial to confirm its operational readiness. Should a fault occur, identify the cause before resetting the device, as repeated tripping indicates an unresolved issue.

Scalability & Long-Term Value

The 5SU9336-1CN06 RCBO from Siemens integrates seamlessly into standard Siemens electrical distribution systems, offering excellent compatibility with other components from the SIVACON and ALPHA series. While the device itself is a fixed-rated protective element, its value lies in its reliability and the extended lifespan characteristic of Siemens industrial products. For future system upgrades or increased load requirements, system designers can leverage other RCBOs or circuit breakers from the Siemens portfolio, ensuring a scalable solution. Its adherence to international standards (e.g., IEC 61009) guarantees long-term relevance and availability of compatible components, supporting the longevity of the electrical installation.

Frequently Asked Questions (FAQs)

Q1: What is the primary function of the Siemens 5SU9336-1CN06 RCBO?

The Siemens 5SU9336-1CN06 RCBO provides combined protection against overcurrents and residual (earth leakage) currents. It safeguards electrical circuits from damage caused by overloads and short circuits. Simultaneously, it detects imbalances in current flow, indicating a leakage to earth, and quickly disconnects the power to prevent electric shock.

This dual protection is vital for ensuring both the integrity of electrical equipment and the safety of personnel. Its 30mA sensitivity is particularly effective for detecting dangerous leakage currents that could pose a severe shock hazard.

The C-curve tripping characteristic is optimized for industrial applications, allowing for temporary inrush currents from inductive loads without causing nuisance tripping. This ensures operational continuity while maintaining a high level of safety.

Q2: Can the Siemens 5SU9336-1CN06 be used for single-phase applications?

While the Siemens 5SU9336-1CN06 is a 3-pole (3P) device, it can be adapted for use in single-phase circuits where a neutral conductor is present and requires protection. In such configurations, typically two poles are used for the live conductors and the neutral conductor.

It is crucial to ensure correct wiring practices are followed, connecting the incoming live and neutral to the designated terminals on the RCBO. The outgoing live and neutral conductors then supply the single-phase load.

Always refer to the specific wiring diagrams provided by Siemens or consult with a qualified electrician to confirm the correct application and wiring method for single-phase systems to ensure safety and compliance.

Q3: What does the "C-Curve" tripping characteristic mean for this RCBO?

A "C-Curve" tripping characteristic indicates that the RCBO will trip due to overcurrents when the current reaches 5 to 10 times its rated current (6A in this case). This range is designed to accommodate the temporary inrush currents commonly experienced with inductive loads, such as motors, transformers, and fluorescent lighting ballasts.

This characteristic helps prevent nuisance tripping during normal startup or operation of machinery, thereby enhancing system reliability. It offers a good balance between protection against short circuits and tolerance for transient overcurrents.

Compared to B-curve breakers (which trip at 3-5 times rated current), C-curve breakers provide more robust protection for circuits feeding equipment with higher inductive loads. This makes the 5SU9336-1CN06 particularly suitable for industrial environments.

Q4: How is the residual current sensitivity of 30mA beneficial?

A residual current sensitivity of 30mA is considered the standard threshold for protecting individuals against dangerous electric shocks. When a leakage current of 30mA or more flows to earth, the RCBO detects this imbalance and interrupts the circuit within milliseconds.

This rapid disconnection is crucial for preventing serious injury or fatality from electric shock. It is especially important in areas where people might come into contact with earth, such as wet environments or workshops.

For many industrial and commercial installations, a 30mA residual current rating is mandated by electrical safety regulations to provide an effective layer of protection against indirect contact hazards.

Q5: What is the breaking capacity (Icn) of the Siemens 5SU9336-1CN06, and why is it important?

The breaking capacity (Icn) of the Siemens 5SU9336-1CN06 is rated at 10kA. This specifies the maximum fault current the RCBO can safely interrupt without sustaining damage to itself. A higher breaking capacity ensures greater safety and reliability in installations with a high potential for short-circuit currents.

This 10kA rating is suitable for most industrial and commercial distribution systems, where fault levels can be significantly higher than in residential settings. It guarantees that the device can effectively clear a severe short circuit, preventing cascading failures or fire hazards.

It is critical that the upstream protective devices (e.g., main distribution board breakers) have a breaking capacity equal to or greater than the expected fault current at their location, and that they are coordinated with the 10kA rating of this RCBO.

Q6: Can I install the Siemens 5SU9336-1CN06 myself, or do I need a professional electrician?

While the installation of RCBOs on a DIN rail is generally straightforward, it is strongly recommended that installation be performed by a qualified and licensed electrician. Working with live electrical circuits carries inherent risks of severe injury or death if not handled correctly.

A professional electrician will have the necessary knowledge, tools, and safety equipment to ensure the RCBO is wired correctly, connections are secure, and the device is properly integrated into the electrical system according to all relevant safety codes and regulations.

Incorrect installation can lead to equipment damage, fire hazards, or failure of the protective device, negating its safety benefits. Therefore, for safety and compliance, professional installation is the prudent choice.

Q7: What is the meaning of "3P" for this RCBO?

The designation "3P" signifies that the Siemens 5SU9336-1CN06 is a 3-pole (three-pole) circuit breaker. This means it is designed to simultaneously switch and protect three separate conductors, typically used for three-phase AC power systems.

In a 3-pole configuration, all three phase conductors of a three-phase supply are connected through the RCBO. This ensures that all phases are disconnected simultaneously in the event of an overcurrent or residual current fault, providing comprehensive protection for three-phase equipment.

While primarily intended for 3-phase applications, 3-pole devices can sometimes be adapted for specific single-phase applications where the neutral conductor also needs switching or protection, though this requires careful consideration of wiring and application.

Q8: How do I test the residual current function of the 5SU9336-1CN06?

The Siemens 5SU9336-1CN06 is equipped with an integrated test button, usually marked with "T" or "Test". To perform a test, ensure the RCBO is energized and the circuit is safe to operate. Press and hold the test button; this simulates a residual current fault.

If the RCBO is functioning correctly, it should trip, disconnecting the power to the connected load. This test should be performed regularly, typically monthly, to verify the operational integrity of the residual current detection mechanism.

After the test trip, the RCBO can be reset by lifting the toggle handle. If the device does not trip during the test, it indicates a potential malfunction, and the RCBO should be replaced immediately by a qualified professional.

Q9: What types of loads are best protected by a C-curve RCBO like the 5SU9336-1CN06?

A C-curve RCBO, such as the Siemens 5SU9336-1CN06, is ideal for circuits supplying loads that exhibit significant inrush current upon startup. This commonly includes equipment with electric motors, transformers, solenoids, and certain types of lighting ballasts.

The C-curve's tripping characteristic is designed to withstand these temporary current surges (5-10 times the rated current) without causing nuisance tripping. This ensures that equipment can start up reliably without interrupting the power supply unnecessarily.

By providing this tolerance for inrush currents, the C-curve offers a practical solution for protecting industrial and commercial circuits that power such inductive or capacitive loads, balancing protection with operational continuity.

Q10: Where can I find the official datasheet or technical documentation for the Siemens 5SU9336-1CN06?

Official technical documentation, including datasheets, installation manuals, and dimensional drawings for the Siemens 5SU9336-1CN06, can typically be found on the Siemens Industry Online Support (SIOS) portal. You will need to navigate to the product support section and search using the product number.

Alternatively, authorized Siemens distributors or electrical supply partners often provide access to product specifications and datasheets upon request or through their online catalogs. These resources will contain detailed technical parameters and application notes.

Always ensure you are referencing the most current documentation available to guarantee accurate information regarding specifications, installation, and operation of the Siemens 5SU9336-1CN06 RCBO.