Siemens 5SV3346-6KK12 RCBO Circuit Breaker 4P 63A 30mA

The Siemens 5SV3346-6KK12 is a robust 4-pole, 63A Residual Current circuit Breaker with Overcurrent protection (RCBO), featuring a 30mA sensitivity, designed for comprehensive electrical safety in demanding industrial environments. This device offers a superior combination of overcurrent and earth leakage protection in a single unit, streamlining panel design and installation. Its key advantages include enhanced safety through rapid fault detection, reduced wiring complexity, and high breaking capacity, making it an ideal choice for protecting circuits against overload, short circuits, and dangerous earth faults.

Product Specifications

| Specification               | Value                         |

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

| Product Type                | RCBO (Residual Current circuit Breaker with Overcurrent protection) |

| Manufacturer                | Siemens                       |

| Model Number                | 5SV3346-6KK12                 |

| Number of Poles             | 4                             |

| Rated Current (In)          | 63 A                          |

| Rated Sensitivity (IΔn)     | 30 mA                         |

| Tripping Characteristic     | Type B                        |

| Rated Breaking Capacity (Icn) | 6 kA                          |

| Rated Voltage (Un)          | 400 V AC                      |

| Frequency                   | 50/60 Hz                      |

| Terminal Type               | Screw Terminal                |

| Mounting Type               | DIN Rail                      |

| Degree of Protection        | IP20                          |

Core Features & Market Positioning

The Siemens 5SV3346-6KK12 distinguishes itself through its high reliability and integrated protection functions. As a 4-pole device, it ensures complete isolation for three-phase systems, crucial for preventing electrical hazards in industrial machinery and complex power distribution networks. Its Type B tripping characteristic provides enhanced protection against both sinusoidal alternating currents and pulsating direct currents, a feature often required for specific types of equipment and installations where DC components might be present. This positions the 5SV3346-6KK12 as a premium solution for applications demanding advanced safety and compliance with stringent electrical codes, offering a significant advantage over simpler circuit breakers or separate RCDs and MCBs.

Key Application Scenarios

This Siemens RCBO is ideally suited for protecting circuits in industrial facilities, commercial buildings, and heavy-duty residential applications where robust protection against earth faults, overcurrents, and short circuits is paramount. Common applications include the protection of motor circuits, distribution boards, lighting circuits, and power outlets connected to sensitive electronic equipment. Its 30mA sensitivity makes it particularly effective for personal protection, safeguarding individuals from electric shock, and also for protecting equipment that may be sensitive to earth leakage currents.

Practical System Integration Guidance

Integrating the Siemens 5SV3346-6KK12 into existing or new electrical systems is straightforward due to its standard DIN rail mounting and robust screw terminal connections. For a 4-pole installation, ensure the incoming power supply (L1, L2, L3, and Neutral) is correctly connected to the respective terminals, and the outgoing protected circuit conductors are routed from the load side. Proper torque must be applied to the terminals to ensure a secure connection and prevent overheating. Earthing connections should be made in accordance with local electrical regulations to ensure effective fault current paths.

Operation and Risk Mitigation

The 5SV3346-6KK12 operates by continuously monitoring the current flowing through the live conductors and the neutral conductor. In the event of an earth fault, where current deviates from its intended path, an imbalance is detected, triggering a rapid trip to disconnect the circuit. This significantly mitigates the risk of electric shock and electrical fires. Regular testing of the RCBO's functionality using the integrated test button is crucial to ensure its operational readiness. Avoid servicing internal components; replacement is the recommended procedure for any suspected malfunction.

Scalability & Long-Term Value

While the 5SV3346-6KK12 is a discrete protection device, its value lies in its compatibility with the broader Siemens SENTRON portfolio. This allows for seamless integration into larger Siemens electrical distribution systems, facilitating future expansions or upgrades. The robust construction and high-quality components ensure a long operational lifespan, minimizing the need for premature replacement and contributing to overall system reliability. Its compliance with international standards further enhances its long-term value by ensuring continued relevance and compatibility with evolving electrical infrastructure.

Frequently Asked Questions (FAQs)

1. What is the primary function of the Siemens 5SV3346-6KK12 RCBO?

This device combines residual current and overcurrent protection. It guards against electric shock and fires caused by earth faults. It also protects against overloads and short circuits.

It acts as both an RCD and an MCB in one unit. This saves space in electrical panels. Its 30mA sensitivity is for personal protection.

The 4-pole design is for three-phase systems. It offers comprehensive circuit protection.

2. How do I install the Siemens 5SV3346-6KK12 in a panel?

Mount the RCBO on a standard 35mm DIN rail. Connect the incoming supply lines (L1, L2, L3, N) to the top terminals. Connect the outgoing circuit conductors to the bottom terminals.

Ensure all connections are secure and torqued correctly. Follow wiring diagrams and local electrical codes. Earth connections are critical for safety.

Use the test button after installation. This verifies the residual current trip function.

3. What types of faults does this RCBO protect against?

It protects against earth leakage faults, where current flows to the ground. This is the residual current protection function. It also protects against overcurrents.

Overcurrent protection includes overloads, which are sustained currents above the rated value. It also protects against short circuits, which are very high, sudden currents.

The 30mA sensitivity is key for detecting dangerous leakage currents. This prevents shocks.

4. Can I use the Siemens 5SV3346-6KK12 for single-phase applications?

While it is a 4-pole device, it can be used in specific three-phase applications needing all four poles. It is not typically the most economical choice for standard single-phase circuits.

For single-phase protection, a 2-pole RCBO is generally recommended. This would cover the live and neutral conductors.

Always consult project requirements and electrical standards. Ensure correct pole configuration for the application.

5. What does the "30mA" rating signify on this RCBO?

The 30mA rating refers to the residual current sensitivity. This is the maximum earth leakage current that will cause the RCBO to trip.

A 30mA tripping current is considered safe for personal protection against electric shock. It acts quickly to disconnect power.

This level of sensitivity also helps protect equipment from damage due to persistent earth leakage.

6. What is the breaking capacity (kA) of the 5SV3346-6KK12?

The breaking capacity is 6 kA. This indicates the maximum fault current the RCBO can safely interrupt.

A 6kA rating is suitable for many industrial and commercial distribution systems. It ensures protection during severe short circuits.

Always ensure the breaking capacity of the device matches the prospective fault current at the installation point.

7. What does "Type B" tripping characteristic mean for this RCBO?

Type B tripping characteristic means it responds to sinusoidal AC currents and pulsating DC currents. This is a broader protection range than Type A.

It's specified for circuits where equipment might introduce DC components into the fault current. This prevents nuisance tripping.

This feature is vital for certain motor drives, power supplies, and electronic loads.

8. How often should I test the Siemens 5SV3346-6KK12?

Regular testing is essential for RCBOs. It is recommended to test monthly using the built-in test button.

The test button simulates an earth fault current. This verifies the tripping mechanism and internal circuitry are functional.

Record test dates and results for maintenance logs. If the RCBO fails testing, it must be replaced immediately.

9. What is the operating voltage (Un) for this RCBO?

The rated operating voltage (Un) is 400 V AC. This specifies the voltage for which the RCBO is designed and tested.

It is suitable for standard three-phase power systems operating at this voltage. Check local supply voltage compatibility.

Ensure the system voltage does not exceed this rating for safe operation.

10. Where is the Siemens 5SV3346-6KK12 typically used in industrial settings?

It's used in main distribution boards and sub-distribution boards for industrial plants. It protects circuits supplying machinery and control panels.

Applications include manufacturing floors, workshops, and processing facilities. It safeguards against electrical hazards in these environments.

Its robustness and comprehensive protection make it a reliable choice for critical industrial power distribution.