Siemens 5SU9156-7VK25 RCCB for Industrial Earth Leakage Protection 25A 10mA 1P+N C

The Siemens 5SU9156-7VK25 is a vital component for industrial earth leakage protection, offering robust safety and reliability. This 25A, 10mA, 1P+N residual current circuit breaker (RCCB) is engineered for demanding environments, ensuring personnel safety and equipment integrity against electrical faults. Its core advantages lie in its swift disconnection capabilities, superior tripping sensitivity, and compact design, making it a preferred choice for critical power distribution systems. The device boasts a high breaking capacity and advanced surge protection features, vital for safeguarding sensitive industrial machinery.

Siemens 5SU9156-7VK25: Product Specifications

| Parameter                 | Value                                |

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

| Product Type              | Residual Current Circuit Breaker (RCCB) |

| Siemens Model Number      | 5SU9156-7VK25                        |

| Rated Current (In)        | 25A                                  |

| Rated Residual Current (IΔn) | 10mA                                 |

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

| Tripping Characteristic   | Type C                               |

| Rated Voltage (Un)        | 230/400V AC                          |

| Frequency                 | 50/60 Hz                             |

| Breaking Capacity (Icn)   | 6 kA                                 |

| Protection Class          | IP20 (enclosure), IP40 (terminal)     |

| Mounting Type             | DIN Rail                             |

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

Core Features & Market Positioning

The Siemens 5SU9156-7VK25 stands out in the industrial protection market due to its advanced tripping technology, offering enhanced sensitivity with a 10mA residual current rating. This ensures rapid detection and disconnection of earth faults, minimizing the risk of electric shock and fire hazards, a critical concern in industrial settings. Its Type C tripping characteristic provides a balance between overcurrent protection and nuisance tripping, making it suitable for circuits with moderate inrush currents, commonly found in industrial machinery. The 1P+N configuration simplifies wiring for single-phase loads that require neutral disconnection, optimizing panel space and installation efficiency. Siemens' reputation for quality and reliability further solidifies the 5SU9156-7VK25's position as a trusted solution for demanding electrical safety applications.

Key Application Scenarios

This RCCB is extensively deployed in industrial environments requiring high levels of safety and reliable power continuity. Key applications include the protection of motor circuits, control panels, and power distribution boards within manufacturing plants, processing facilities, and automated production lines. Its 10mA sensitivity is particularly crucial for applications where personnel are in close proximity to electrical equipment, such as in areas with machinery operation or maintenance. It serves as an essential safety device in environments with potential for increased leakage currents, including those with high humidity or dust, ensuring compliance with stringent industrial safety regulations. The 25A rating is ideal for protecting circuits feeding moderate-load equipment common in these sectors.

Practical System Integration Guidance

Integrating the Siemens 5SU9156-7VK25 into an industrial electrical system is straightforward, designed for standard DIN rail mounting. The device clearly marked terminals facilitate correct wiring for live and neutral conductors. Ensure the incoming power supply is de-energized before installation. The 1P+N configuration requires connection of the live conductor to terminal L and the neutral conductor to terminal N on the load side, with corresponding supply connections on the line side. For optimal system protection, it is crucial to connect the RCCB downstream of overcurrent protective devices like miniature circuit breakers (MCBs) or fuses that are rated appropriately for the circuit's continuous load.

Operation and Risk Mitigation

The primary function of the Siemens 5SU9156-7VK25 is to detect residual currents and rapidly interrupt the circuit, thereby mitigating risks of electric shock, equipment damage, and electrical fires. In the event of an earth fault, a current imbalance between the live and neutral conductors exceeding the 10mA threshold will trigger the device to trip. Regular testing of the RCCB using its integrated test button is paramount to verify its operational integrity. Periodic manual operation of the test button under load conditions, where permissible and safe, ensures the tripping mechanism remains functional. If the device trips unexpectedly, it indicates a fault in the protected circuit; troubleshooting should focus on identifying the source of the leakage current before resetting the breaker.

Scalability & Long-Term Value

The Siemens 5SU9156-7VK25 offers significant long-term value through its robust construction and compatibility with Siemens' broader industrial control and automation platforms. Its modular design allows for easy replacement or addition to existing distribution panels, supporting system expansion or upgrades. While this specific model focuses on core earth leakage protection, it can be integrated into more complex safety systems and smart grids where compatible upstream and downstream components are used. Its adherence to international standards ensures continued relevance and interoperability with evolving electrical infrastructure and IIoT integration strategies in industrial settings.

Frequently Asked Questions

What is the primary purpose of the Siemens 5SU9156-7VK25?

The Siemens 5SU9156-7VK25 is designed to detect earth leakage currents. It rapidly disconnects the circuit when a fault current exceeds the 10mA threshold, preventing electric shocks. This ensures a high level of safety for personnel and connected equipment.

How does the 10mA sensitivity benefit industrial applications?

A 10mA sensitivity offers enhanced protection against dangerous electric shock. It is particularly vital in environments where people frequently interact with machinery. This rapid disconnection minimizes exposure time to hazardous current levels.

What type of applications is the Siemens 5SU9156-7VK25 best suited for?

This RCCB is ideal for protecting circuits in manufacturing, processing plants, and automation systems. It's excellent for motor controls, distribution boards, and areas requiring high safety standards. Its 25A rating fits moderate load circuits.

Is the Siemens 5SU9156-7VK25 compatible with standard industrial panels?

Yes, it is designed for standard DIN rail mounting, ensuring easy integration. Its 1P+N configuration simplifies wiring for single-phase circuits with neutral requirements. This makes installation efficient in most industrial panels.

How often should the test button on the 5SU9156-7VK25 be used?

Regular testing is crucial for confirming functionality. It is recommended to test monthly, or as per site-specific safety protocols. This ensures the tripping mechanism is operational and ready to protect.

What does a Type C tripping characteristic mean for this RCCB?

Type C indicates it can handle moderate inrush currents without nuisance tripping. This is common in industrial settings with motors or inductive loads. It balances sensitivity to faults with immunity to temporary surges.

Can the Siemens 5SU9156-7VK25 be used for overcurrent protection?

No, this device is specifically an RCCB for earth leakage protection. While it has a current rating of 25A, separate overcurrent protection devices (like MCBs or fuses) are required. These should be installed upstream to protect against overload and short circuits.

What steps should be taken if the 5SU9156-7VK25 trips unexpectedly?

An unexpected trip signifies an earth leakage fault within the protected circuit. First, disconnect all loads from the circuit. Then, attempt to reset the RCCB. If it trips again, a professional electrician should investigate the circuit for the fault source.

How does this RCCB contribute to overall system safety?

It acts as a vital safety layer against electrical hazards. By preventing dangerous current flow to earth, it mitigates risks of electrocution, fires, and equipment damage. It is a fundamental component of any robust industrial electrical safety system.

What is the breaking capacity of the Siemens 5SU9156-7VK25?

The breaking capacity (Icn) of this RCCB is 6 kA. This indicates its ability to safely interrupt fault currents up to 6,000 amps. This rating is sufficient for most standard industrial distribution applications.