Siemens 5SU1656-1KK32 RCCB for Industrial Electronic Equipment Protection 32A 300mA 1P+N C

The Siemens 5SU1656-1KK32 Residual Current Circuit Breaker (RCCB) is engineered for robust protection of industrial electronic equipment. This 32A, 300mA, 1-pole+neutral device, with a Type C tripping characteristic, offers advanced safety and operational continuity in demanding industrial environments. Its primary advantage lies in its ability to swiftly detect and interrupt fault currents, safeguarding personnel and sensitive machinery from electrical hazards, while its high breaking capacity ensures reliable performance even under fault conditions.

Product Specifications

| Feature                 | Specification                               |

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

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

| Manufacturer            | Siemens                                     |

| Model Number            | 5SU1656-1KK32                               |

| Rated Current (In)      | 32A                                         |

| Rated Residual Current  | 300mA                                       |

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

| Tripping Characteristic | Type C                                      |

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

| Frequency               | 50/60 Hz                                    |

| Breaking Capacity (Icn) | 6kA                                         |

| Mounting Type           | DIN Rail                                    |

| Protection Class        | IP20                                        |

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

| Standards Compliance    | IEC/EN 61008-1                              |

Core Features & Market Positioning

The Siemens 5SU1656-1KK32 RCCB stands out in the industrial protection market due to its inherent reliability and advanced safety features. Its Type C tripping characteristic is specifically designed to handle inrush currents typical of inductive loads found in industrial settings, such as motors and transformers, without nuisance tripping. This differentiation is critical for maintaining operational uptime in sectors relying on continuous power. The device's robust construction and adherence to stringent IEC/EN 61008-1 standards position it as a premium choice for applications demanding high levels of safety and performance in challenging industrial electronic environments. Its 300mA residual current sensitivity offers a crucial layer of protection against severe electric shock hazards.

Key Application Scenarios

This Siemens RCCB is ideally suited for safeguarding critical industrial electronic equipment across various sectors. It is extensively deployed in manufacturing plants to protect motor control centers, automation systems, and process control units. In the energy sector, it provides essential protection for switchboards and distribution panels feeding sensitive electronic instrumentation. Furthermore, its application extends to data centers and telecommunication facilities where uninterrupted power and protection against earth faults are paramount. The 32A rating and 1P+N configuration make it a versatile solution for single-phase and some phase-to-neutral circuits within these demanding environments.

Practical System Integration Guidance

Integrating the Siemens 5SU1656-1KK32 RCCB into existing industrial electrical systems is straightforward, leveraging standard DIN rail mounting for quick installation. Proper wiring is crucial: connect the line conductors to the designated input terminals and the neutral conductor to its corresponding terminal. Ensure the incoming power source is de-energized before commencing any work. The output terminals are then connected to the protected load circuit. For systems requiring coordinated protection, understanding its 6kA breaking capacity is vital to ensure it is appropriately rated for the prospective fault current of the circuit it protects. The clear terminal markings facilitate correct and safe connections, minimizing installation errors.

Operation and Risk Mitigation

The primary operation of the Siemens 5SU1656-1KK32 RCCB involves continuously monitoring the balance of current flowing through the live and neutral conductors. If an imbalance exceeding the 300mA threshold occurs, indicating a leakage current (often due to a fault to earth or insulation failure), the device rapidly trips, disconnecting the power supply. This mechanism significantly mitigates the risk of electric shock to personnel by preventing sustained contact with energized parts and reduces the potential for fire damage caused by persistent earth faults. Regular testing using a dedicated RCCB tester is recommended to ensure its operational integrity and to confirm that the tripping time and residual current thresholds remain within specification.

Scalability & Long-Term Value

The Siemens 5SU1656-1KK32 RCCB offers excellent long-term value through its compatibility with the broader Siemens industrial automation ecosystem. While not inherently a "smart" device, its integration into Siemens distribution boards and control panels ensures seamless interoperability with other Siemens components. This compatibility facilitates future system expansions and upgrades. For environments moving towards digitalization and IIoT, the 5SU1656-1KK32 can be incorporated into systems where upstream monitoring and data acquisition are managed by intelligent switchgear or remote terminal units, providing essential circuit-level protection within a networked industrial operation.

FAQs

1. What is the primary function of the Siemens 5SU1656-1KK32 RCCB?

This device provides essential protection against earth leakage currents. It safeguards personnel from electric shock hazards. It also protects electrical equipment from damage due to faults.

2. Can the Siemens 5SU1656-1KK32 be used for overload protection?

No, an RCCB primarily detects residual currents. Overload protection is typically handled by a separate circuit breaker or overload relay. This unit focuses on earth fault protection.

3. What does the "300mA" rating signify on this RCCB?

The 300mA indicates the sensitivity to earth fault currents. It trips when the difference between live and neutral current reaches this level. This is a higher sensitivity for fire protection.

4. What does "1P+N" mean for the Siemens 5SU1656-1KK32?

It signifies a 1-pole plus neutral configuration. This means it switches both the live and neutral conductors. It is suitable for single-phase circuits.

5. What type of loads is the "Type C" characteristic suitable for?

Type C is designed for inductive loads with moderate inrush currents. Examples include small motors and transformers. It avoids nuisance tripping during startup.

6. What is the breaking capacity (Icn) of the 5SU1656-1KK32?

The breaking capacity is 6kA. This is the maximum fault current it can safely interrupt. It must be coordinated with the upstream protective devices.

7. How do I correctly wire the Siemens 5SU1656-1KK32?

Connect incoming live and neutral to the top terminals. Connect outgoing live and neutral to the bottom terminals. Ensure power is off before wiring.

8. What standards does this RCCB comply with?

It complies with IEC/EN 61008-1 standards. These are international safety and performance requirements. This ensures reliable and safe operation.

9. Can this RCCB be used in outdoor industrial applications?

With an IP20 rating, it is designed for indoor use. Outdoor installation requires appropriate enclosure protection. It is sensitive to moisture and dust ingress.

10. How often should I test the functionality of this RCCB?

Regular testing is advised, typically every 6-12 months. Use a dedicated RCCB test instrument. This confirms its tripping function and sensitivity.