Siemens 5SU9356-2CN06 RCBO for Small Current Earth Leakage Protection 6A 30mA 1P+N D

The Siemens 5SU9356-2CN06 RCBO is a high-performance residual current circuit breaker with overcurrent protection, specifically designed for small current earth leakage protection. This sophisticated device offers a rated current of 6A, a residual current sensitivity of 30mA, and a single-pole plus neutral configuration (1P+N), making it ideal for safeguarding sensitive electrical circuits and equipment. Its key advantages include superior earth leakage detection, reliable overcurrent protection, and compact design, ensuring enhanced safety and operational continuity in demanding industrial and commercial environments. The product boasts a breaking capacity of 6kA, a tripping characteristic of Type C, and meets stringent international standards such as IEC/EN 61009-1.

Product Specifications

| Feature                   | Specification                  |

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

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

| Model Number              | 5SU9356-2CN06                  |

| Rated Current (In)        | 6A                             |

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

| Number of Poles           | 1P+N (Single Pole + Neutral)   |

| Rated Breaking Capacity (Icn) | 6kA                            |

| Tripping Characteristic   | Type C                         |

| Rated Voltage (Un)        | 230/240V AC                    |

| Frequency                 | 50/60 Hz                       |

| Protection Type           | Earth Leakage, Overcurrent, Short Circuit |

| Mounting Type             | DIN Rail                       |

| Compliance Standards      | IEC/EN 61009-1                 |

Core Features & Market Positioning

The Siemens 5SU9356-2CN06 RCBO distinguishes itself through its advanced residual current detection technology, providing rapid and reliable protection against dangerous earth faults. This is particularly crucial in applications where even small leakage currents can pose significant risks to personnel and equipment. Its Type C tripping characteristic ensures it can handle moderate inrush currents without nuisance tripping, a common issue with Type B breakers in motor-driven applications. Positioned as a premium safety solution, this RCBO integrates two essential protective functions – residual current and overcurrent protection – into a single, space-saving unit, simplifying panel design and installation. The Siemens brand inherently carries a reputation for quality and reliability, further solidifying its market position among electrical engineers and specifiers who prioritize robust and dependable protection systems.

Key Application Scenarios

This Siemens RCBO is exceptionally well-suited for protecting individual circuits in commercial buildings, such as lighting, power outlets, and HVAC systems, where enhanced earth leakage sensitivity is paramount. In industrial settings, it is a vital component for safeguarding sensitive electronic equipment, control systems, and machinery operating with small power requirements. Its 6A rating and 30mA sensitivity also make it an excellent choice for residential applications, particularly for circuits supplying sensitive electronics like home entertainment systems or specific appliance circuits requiring precise fault detection. The 1P+N configuration is ideal for single-phase systems where neutral disconnect is required for complete isolation.

Practical System Integration Guidance

Integrating the Siemens 5SU9356-2CN06 RCBO into existing or new electrical panels is straightforward due to its standard DIN rail mounting. Wiring involves connecting the line and neutral conductors to the designated input terminals and then connecting the load-side conductors from the output terminals to the protected circuit. It is imperative to ensure that the neutral conductor from the supply is connected to the neutral terminal of the RCBO, and the line conductor is connected to the line terminal. Proper grounding of the enclosure and the protected equipment is also critical for the effective operation of the earth leakage protection function. This RCBO is designed to be part of a comprehensive protective system, often installed downstream of the main incomer to provide localized protection for specific circuits.

Operation and Risk Mitigation

The primary function of the 5SU9356-2CN06 RCBO is to continuously monitor the current flowing through the live and neutral conductors. If an imbalance occurs, indicating current is leaking to earth, the device rapidly disconnects the circuit, preventing electric shock and potential fire hazards. Overcurrent protection is also integrated, tripping the breaker in response to overloads or short circuits. Regular testing of the residual current function via the integrated test button (typically marked 'T') is a critical risk mitigation strategy, ensuring the device remains operational. Users should be aware that the Type C characteristic is selected for specific load types; using it with loads requiring different tripping curves might compromise protection.

Scalability & Long-Term Value

The Siemens 5SU9356-2CN06 RCBO, as part of the broader Siemens SENTRON protection devices portfolio, offers excellent compatibility with other Siemens components. This ensures seamless integration into larger Siemens electrical distribution systems, facilitating system expansion and upgrades. While this specific unit is designed for individual circuit protection, its inclusion in a standardized system architecture allows for predictable scalability by adding more RCBOs or complementary protection devices as needed. Its robust construction and adherence to international quality standards ensure a long operational lifespan, contributing to the long-term value and reliability of the electrical installation.

Frequently Asked Questions

What is the primary function of the Siemens 5SU9356-2CN06 RCBO?

The Siemens 5SU9356-2CN06 RCBO combines residual current protection with overcurrent protection. It safeguards electrical circuits against dangerous earth leakages. It also protects against overloads and short circuits.

This device is designed for small current earth leakage protection. Its 30mA sensitivity is crucial for preventing electric shock. It ensures enhanced safety for personnel and equipment.

The RCBO offers a Type C tripping characteristic, suitable for moderate inrush currents. This makes it versatile for various applications. It provides reliable and comprehensive circuit protection.

What are the key technical specifications of this RCBO?

This RCBO has a rated current of 6A. Its rated residual operating current is 30mA. It operates on a 230/240V AC supply.

The breaking capacity is rated at 6kA. It features a 1P+N configuration, meaning single pole and neutral. The frequency range is 50/60 Hz.

It complies with IEC/EN 61009-1 standards. The mounting is standard DIN rail for easy installation. This ensures compatibility and adherence to safety regulations.

How does the 30mA sensitivity protect against electric shock?

The 30mA sensitivity means the RCBO will trip when it detects a leakage current of 30 milliamperes or more. This current level is generally considered the threshold for causing dangerous physiological effects. It acts quickly to interrupt power before serious harm occurs.

This rapid disconnection is vital for preventing severe electric shock. It significantly reduces the risk of injury or fatality from earth faults. The 30mA setting is standard for personnel protection in many regulations.

The RCBO continuously monitors the balance of current. If current flows through an unintended path (like a person) to earth, the imbalance triggers the device. This ensures immediate response to potentially lethal situations.

Where is the Siemens 5SU9356-2CN06 RCBO typically installed?

This RCBO is commonly installed in consumer units or distribution boards. It is used to protect individual circuits. Examples include sockets, lighting, and specific appliance circuits.

It is ideal for commercial and industrial applications. This includes protecting sensitive electronic equipment and control systems. Its compact size saves valuable panel space.

The 1P+N design is suitable for single-phase installations. It provides localized protection where needed most. This ensures targeted safety for specific electrical loads.

What is the significance of the Type C tripping characteristic?

A Type C tripping characteristic indicates that the RCBO will trip if the current exceeds 5 to 10 times its rated current. This is designed to accommodate higher inrush currents. These are common in inductive loads like motors or transformers.

It prevents nuisance tripping during normal operation. This is crucial for equipment that may experience temporary current surges. It ensures the circuit remains operational under typical conditions.

Compared to Type B, Type C offers a balance between sensitivity and immunity to transient overcurrents. It is a versatile choice for many general-purpose applications. It provides effective protection against overloads and short circuits.

How do I test the functionality of this RCBO?

Most RCBOs, including the Siemens 5SU9356-2CN06, have a built-in test button, usually marked 'T'. Pressing this button simulates an earth fault. It should cause the RCBO to trip, disconnecting the circuit.

Regular testing is essential to ensure the residual current detection mechanism is functioning correctly. It is recommended to perform these tests periodically, such as monthly. This confirms the safety device is operational.

After testing, the RCBO can be reset by lifting the switch. If the RCBO does not trip when the test button is pressed, it indicates a fault. The device should be replaced immediately by a qualified electrician.

What is the breaking capacity (6kA) of this RCBO?

The 6kA breaking capacity signifies the maximum fault current the RCBO can safely interrupt. This rating is crucial for ensuring the device can withstand and safely clear a short circuit without sustaining damage. It protects the rest of the electrical system.

A higher breaking capacity is generally preferred in installations where higher fault currents are possible. 6kA is a standard rating for many residential and light commercial applications. It provides adequate protection for most typical scenarios.

Selecting an RCBO with a breaking capacity appropriate for the installation's potential fault current is vital. This ensures safety and compliance with electrical codes. It prevents catastrophic failures during a fault event.

Can this RCBO be used in residential or domestic applications?

Yes, the Siemens 5SU9356-2CN06 RCBO is highly suitable for residential use. Its 30mA sensitivity is standard for personnel protection in homes. It enhances safety for all circuits.

It is particularly useful for circuits supplying sensitive electronics. This includes home theaters, computers, and charging stations. It prevents damage from earth leakages.

Its compact 1P+N design is ideal for modern homes. It offers reliable protection against electric shock and fire hazards. It can be installed in domestic distribution boards.

What does "1P+N" signify for this RCBO?

"1P+N" stands for Single Pole plus Neutral. This means the RCBO contains switching elements for both the live (line) conductor and the neutral conductor. Both are disconnected simultaneously during a trip event.

This configuration ensures complete isolation of the circuit. It is important for safety during maintenance or fault conditions. It guarantees that both conductors are de-energized.

It is specifically designed for single-phase AC circuits. In such circuits, the neutral conductor carries current back to the source. Disconnecting both ensures effective protection and isolation.

What is the difference between an RCBO and an RCD?

An RCD (Residual Current Device) primarily detects earth leakage currents. It trips to prevent electric shock but does not offer overcurrent protection. It needs to be paired with a separate Miniature Circuit Breaker (MCB) for overcurrent protection.

An RCBO (Residual Current Breaker with Overcurrent Protection) integrates both functions. It combines the earth leakage detection of an RCD with the overcurrent (overload and short-circuit) protection of an MCB into a single device. This simplifies installation and saves space.

Therefore, an RCBO offers a more comprehensive, all-in-one protection solution for a circuit. It is often preferred for its convenience and space-saving benefits. The Siemens 5SU9356-2CN06 is an example of an RCBO.