Siemens 5SU9356-7KK10 High Safety RCBO 10A 30mA 1P+N C

The Siemens 5SU9356-7KK10 is a sophisticated Residual Current Circuit Breaker with Overcurrent protection (RCBO) designed for enhanced electrical safety in demanding industrial and commercial environments. This 10A, 30mA, 1P+N (single-pole plus neutral) device offers a C-curve tripping characteristic, ideal for circuits with moderate inrush currents. It provides crucial protection against electric shock, fire hazards, and overloads, safeguarding both personnel and valuable equipment. Its compact design and high breaking capacity ensure reliable performance and efficient panel space utilization.

Product Specifications

| Feature              | Specification                                |

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

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

| Manufacturer         | Siemens                                      |

| Model Number         | 5SU9356-7KK10                                |

| Rated Current (In)   | 10A                                          |

| Rated Residual Current (IΔn) | 30mA                                         |

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

| Tripping Curve       | C                                            |

| Rated Voltage (Ue)   | 230V AC                                      |

| Rated Breaking Capacity (Icn) | 6 kA                                         |

| Frequency            | 50/60 Hz                                     |

| Terminal Type        | Screw Terminals                              |

| Mounting Type        | DIN Rail (35mm)                              |

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

| Degree of Protection | IP20                                         |

Core Features & Market Positioning

The Siemens 5SU9356-7KK10 stands out in the market due to its robust construction and advanced safety features, aligning with Siemens' reputation for high-quality electrical components. Its integrated residual current and overcurrent protection simplifies installation and reduces the number of devices required in a distribution board, offering a cost-effective and space-saving solution. The C-curve tripping characteristic is particularly advantageous for applications where electrical equipment, such as motors or lighting systems, may experience temporary inrush currents during startup, preventing nuisance tripping while maintaining essential protection. This combination of comprehensive safety, reliability, and application versatility positions the 5SU9356-7KK10 as a premium choice for electricians and engineers prioritizing safety and operational efficiency.

Key Application Scenarios

This RCBO is exceptionally well-suited for a variety of critical applications. It is a standard choice for protecting circuits in residential and commercial buildings, particularly where the risk of electric shock is a concern, such as in kitchens, bathrooms, and outdoor installations. In industrial settings, the Siemens 5SU9356-7KK10 is deployed to safeguard individual machinery, control panels, and lighting circuits that operate with moderate inductive loads, benefiting from the C-curve's tolerance for inrush. Its 30mA sensitivity ensures personal protection against indirect contact, making it a vital component in ensuring compliance with stringent electrical safety regulations across diverse sectors.

Practical System Integration Guidance

Integrating the Siemens 5SU9356-7KK10 into existing or new electrical systems is straightforward, adhering to standard DIN rail mounting practices. Ensure the main power supply is safely isolated before commencing any installation. Connect the line conductor to the designated "L" terminal and the neutral conductor to the "N" terminal on the input side of the RCBO. The outgoing load conductors should then be connected to the corresponding "L" and "N" output terminals. Always verify that the incoming voltage and frequency are within the product's specified operational limits (230V AC, 50/60 Hz). For circuits requiring multiple RCBOs or other protective devices, ensure adequate spacing and proper busbar or wiring connections to maintain system integrity and prevent overheating.

Operation and Risk Mitigation

The 5SU9356-7KK10 RCBO operates by continuously monitoring the balance of current flowing through the live and neutral conductors. If an imbalance of 30mA or more is detected, indicating current leakage to earth (a potential shock hazard), the device rapidly trips, disconnecting the circuit. Simultaneously, it provides protection against overcurrents (overloads and short circuits) with its C-curve characteristic, tripping within specific time-current thresholds to prevent damage to wiring and connected equipment. Regular testing of the residual current function is crucial; most RCBOs feature a test button (typically marked 'T') that, when pressed, simulates a fault and should cause the device to trip. This simple test, performed periodically, is a key risk mitigation strategy.

Scalability & Long-Term Value

The Siemens 5SU9356-7KK10 offers excellent long-term value through its robust design and compatibility with the broader Siemens SENTRON system portfolio. While this specific RCBO is a single-unit solution for combined overcurrent and residual current protection, its installation within a Siemens distribution board allows for easy expansion and modification of circuits. It integrates seamlessly with other Siemens circuit breakers, busbars, and enclosures, facilitating upgrades or reconfigurations as building or system requirements evolve. The inherent quality and durability of Siemens components ensure a long operational lifespan, minimizing the need for premature replacements and contributing to the overall reliability and cost-effectiveness of the electrical infrastructure.

FAQs

1. What is the primary function of the Siemens 5SU9356-7KK10 RCBO?

This device offers combined protection against electrical shocks and overcurrents. It detects dangerous earth leakages and trips quickly. It also safeguards against overloads and short circuits in electrical circuits.

2. What does "10A 30mA C" signify on the Siemens 5SU9356-7KK10?

"10A" denotes its rated current-carrying capacity for normal operation. "30mA" is the sensitivity for detecting earth leakage currents, crucial for personal safety. "C" indicates its tripping curve for overcurrent protection, suitable for loads with moderate inrush.

3. Can the Siemens 5SU9356-7KK10 be used for lighting circuits?

Yes, this RCBO is suitable for protecting lighting circuits, especially those with fluorescent or LED drivers that might cause small inrush currents. Its C-curve characteristic provides adequate tolerance for such conditions. The 30mA sensitivity ensures safety for personnel in case of faults.

4. What is the breaking capacity of the Siemens 5SU9356-7KK10?

The Siemens 5SU9356-7KK10 has a rated breaking capacity of 6 kA. This means it can safely interrupt fault currents up to 6,000 amperes without sustaining damage. This capacity is sufficient for most residential and commercial distribution systems.

5. How do I test the residual current function of the 5SU9356-7KK10?

Locate the test button, typically marked with a "T," on the front of the RCBO. With the circuit energized, press the test button. The RCBO should immediately trip, disconnecting the power. This verifies the residual current detection is operational.

6. Is the Siemens 5SU9356-7KK10 suitable for industrial motor protection?

For smaller motors with moderate starting currents, this RCBO can be suitable. However, larger motors with significant inrush may require RCBOs with higher current ratings or specific motor protection features. Always consult motor specifications and electrical codes.

7. What are the installation requirements for the Siemens 5SU9356-7KK10?

It mounts on a standard 35mm DIN rail within an electrical distribution board. Ensure the circuit is de-energized before installation. Connect live and neutral conductors to the input terminals and load conductors to the output terminals as per wiring diagrams.

8. What type of fault will cause the 5SU9356-7KK10 to trip?

It trips due to earth leakage currents (residual currents) exceeding 30mA. It also trips due to overcurrents, which include overloads and short circuits, as defined by its C-curve characteristic.

9. What is the difference between an RCBO and an RCD or MCB?

An RCD (Residual Current Device) only protects against earth leakage. An MCB (Miniature Circuit Breaker) only protects against overcurrents (overloads and short circuits). An RCBO combines both functions into a single device.

10. Where is the best place to install this type of RCBO?

Install it in main distribution boards or sub-distribution boards to protect specific circuits. It is ideal for circuits supplying outlets in damp areas, outdoor equipment, or any application where personal protection against electric shock is paramount.