Siemens 5SN6416-7CN Miniature Circuit Breaker (MCB) 4P 16A

The Siemens 5SN6416-7CN Miniature Circuit Breaker (MCB) 4P 16A stands as a robust and reliable solution for electrical protection in diverse industrial and commercial applications. This four-pole, 16-ampere MCB offers superior overcurrent and short-circuit protection, ensuring the safety and operational integrity of electrical circuits. Its advanced thermal-magnetic tripping mechanism guarantees precise and rapid response to fault conditions, minimizing downtime and preventing equipment damage. Designed for seamless integration into standard distribution boards, the 5SN6416-7CN MCB features a compact footprint and user-friendly installation process, making it a preferred choice for electricians and system integrators. With a breaking capacity of 6kA, it is well-suited for handling fault currents prevalent in many electrical installations.

Product Specifications

| Feature                | Specification                           |

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

| Product Type           | Miniature Circuit Breaker (MCB)         |

| Manufacturer           | Siemens                                 |

| Series                 | 5SN                                     |

| Number of Poles        | 4                                       |

| Rated Current (In)     | 16 A                                    |

| Rated Voltage (Un)     | 400 V AC                                |

| Breaking Capacity (Icn) | 6 kA                                    |

| Tripping Characteristic| C                                       |

| Frequency              | 50/60 Hz                                |

| Terminal Type          | Screw Terminals                         |

| Mounting Type          | DIN Rail                                |

| Protection Class       | IP20                                    |

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

Core Features & Market Positioning

The Siemens 5SN6416-7CN MCB distinguishes itself through its exceptional reliability and adherence to stringent international safety standards, positioning it as a premium component in the electrical protection market. Its robust construction and high-quality materials ensure longevity and consistent performance even in demanding environments. The C-curve tripping characteristic offers a balance between protection against overload and sensitivity to short circuits, making it versatile for a wide range of inductive and capacitive loads commonly found in industrial settings. This MCB's integration into Siemens' comprehensive portfolio of electrical distribution products also provides customers with a cohesive system approach, enhancing interoperability and ease of maintenance.

Key Application Scenarios

This Siemens 4-pole MCB finds extensive use in protecting main power supplies for commercial buildings, small industrial plants, and sophisticated residential complexes. It is ideal for safeguarding distribution boards that feed multiple circuits, such as those powering machinery, lighting systems, and HVAC equipment. Its 16A rating and 6kA breaking capacity make it suitable for protecting circuits with moderate to high inrush currents, common in motor control applications and power distribution panels within manufacturing facilities.

Practical System Integration Guidance

Installing the Siemens 5SN6416-7CN MCB is straightforward, requiring it to be clipped onto a standard 35mm DIN rail within an appropriate enclosure. Ensure that the incoming power supply is safely disconnected before commencing any wiring. Connect the phase conductors to terminals L1, L2, L3, and L4, and the neutral conductor to the designated neutral terminal, observing correct polarity. For optimal performance and safety, it is crucial to use appropriately sized conductors and ensure all screw terminals are tightened securely to the manufacturer's recommended torque specifications.

Operation and Risk Mitigation

The primary function of the Siemens 5SN6416-7CN MCB is to automatically interrupt electrical current when it exceeds safe limits due to overloads or short circuits, thereby preventing fires and equipment damage. The thermal element responds to sustained overloads by deforming a bimetallic strip, while the magnetic element reacts instantaneously to high fault currents. To mitigate risks, always ensure the MCB is rated for the circuit's load and that the upstream protective devices are correctly coordinated. Avoid tampering with the internal mechanisms, and in case of repeated tripping, investigate the underlying cause of the fault rather than replacing the MCB without addressing the issue.

Scalability & Long-Term Value

The 5SN6416 series, including the 5SN6416-7CN, offers excellent compatibility with Siemens' broader range of low-voltage electrical components, facilitating seamless integration into existing or future Siemens-based electrical infrastructure. This compatibility ensures that as power demands or system complexities evolve, upgrades or expansions can be managed efficiently without requiring a complete overhaul of the protection system. The durability and adherence to rigorous quality standards inherent in Siemens products contribute to a long service life, reducing the total cost of ownership and providing sustained operational value.

Frequently Asked Questions (FAQs)

What is the breaking capacity of the Siemens 5SN6416-7CN MCB?

The Siemens 5SN6416-7CN MCB features a breaking capacity of 6 kA. This rating indicates the maximum fault current it can safely interrupt without sustaining damage. It is crucial for ensuring protection against severe short-circuit events in industrial and commercial electrical systems.

This 6 kA rating is sufficient for many standard distribution circuits. It is essential to verify this capacity against the prospective short-circuit current at the point of installation to ensure adequate protection.

Understanding the breaking capacity is vital for system safety and preventing cascading failures. Always consult system design specifications and local electrical codes for precise requirements.

Can the Siemens 5SN6416-7CN MCB be used for DC circuits?

No, the Siemens 5SN6416-7CN MCB is specifically designed and rated for AC circuits only. Using it on DC circuits can lead to arc instability and failure to trip properly, posing significant safety risks.

For DC applications, it is imperative to select MCBs specifically designed for direct current. These devices have different arc-quenching mechanisms and voltage ratings suitable for DC systems.

Always refer to the product datasheet or consult with a qualified electrician to ensure the correct type of circuit breaker is used for the intended application, whether AC or DC.

What does the "C" in the tripping characteristic C mean for this MCB?

The "C" in the tripping characteristic C signifies that the MCB is designed to trip between 5 to 10 times its rated current. This characteristic is suitable for circuits with moderate inrush currents, such as those powering fluorescent lighting or small to medium-sized motors.

This feature provides a good balance between overload protection and short-circuit protection for inductive and capacitive loads. It prevents nuisance tripping from temporary surges but still reacts quickly to dangerous fault conditions.

Understanding the tripping characteristic ensures appropriate application. A "B" curve is more sensitive for resistive loads, while a "D" curve is for loads with very high inrush currents.