Siemens 5SY6214-7CC Three Pole Miniature Air Circuit Breaker 2P 0.3A

The Siemens 5SY6214-7CC is a robust three-pole miniature air circuit breaker (MCB) designed for reliable protection of electrical circuits. It offers a breaking capacity of 6 kA and a rated current of 0.3A, making it suitable for applications requiring sensitive overcurrent and short-circuit protection. The "C" characteristic indicates its tripping behavior, designed to handle moderate inrush currents without nuisance tripping, while still providing rapid disconnection for short circuits. This MCB is built to meet stringent industrial standards and ensures operational safety and system availability.

Product Specifications

| Specification                    | Value                                              |

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

| Manufacturer                     | Siemens                                            |

| Series                           | 5SY                                                |

| Model Number                     | 5SY6214-7CC                                        |

| Number of Poles                  | 3 (Three Pole)                                     |

| Rated Current (Inom)             | 0.3A                                               |

| Tripping Characteristic          | C Curve                                            |

| Breaking Capacity                | 6 kA                                               |

| Rated Voltage                    | 230/400V AC                                        |

| Insulation Voltage (Ui)          | 440V AC (single/multi-phase)                       |

| Frequency                        | 50/60 Hz                                           |

| Protection Class                 | IP20 (with connected conductors)                   |

| Mounting Type                    | DIN Rail Mount                                     |

| Dimensions (H x W x D)           | 90 mm x 36 mm x 76 mm (approx.)                    |

| Installation Depth               | 70 mm                                              |

| Mechanical Service Life          | 10,000 operating cycles (typical)                  |

| Operating Temperature            | -25°C to +55°C                                     |

| Standards                        | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077             |

| Conductor Cross-section (Solid)  | 0.75 mm² - 35 mm²                                  |

| Conductor Cross-section (Stranded)| 0.75 mm² - 35 mm²                                  |

| Tightening Torque                | 2.5 - 3.5 N·m                                      |

| Touch Protection                 | Yes                                                |

Core Features & Market Positioning

The Siemens 5SY6214-7CC stands out in the competitive landscape of miniature circuit breakers due to its robust construction and adherence to high-quality Siemens standards. Its market positioning is firmly rooted in providing reliable, safe, and efficient circuit protection for a wide array of industrial and commercial applications. Key differentiators include its superior touch protection, ensuring user safety during installation and maintenance, and its snap-on fixing system for rapid and tool-free mounting on DIN rails. The use of uniform additional components across the SENTRON portfolio simplifies inventory management and enhances application flexibility. This focus on user-centric design and comprehensive protection capabilities makes the 5SY6214-7CC a preferred choice for professionals seeking dependable electrical safety solutions.

Key Application Scenarios

The Siemens 5SY6214-7CC is exceptionally well-suited for protecting circuits in various demanding environments. Its 0.3A rating and C-curve characteristic make it ideal for safeguarding control circuits, sensitive electronic equipment, and small motor loads where moderate inrush currents are present. Common applications include protection for control cabinets, air-conditioning and ventilation systems, and controllers within industrial settings. It also finds utility in commercial buildings for socket outlet and lighting circuits where a switchable neutral conductor is required, offering space savings in distribution boards. The UL 1077 supplementary protection certification further extends its application range to secondary protection for more sensitive devices within panels.

Practical System Integration Guidance

Integrating the Siemens 5SY6214-7CC into existing electrical systems is straightforward due to its user-friendly design. The breaker features identical terminals for top or bottom infeed, simplifying wiring configurations. It supports a wide range of conductor cross-sections, from 0.75 mm² to 35 mm² for solid and stranded conductors, with specific requirements for finely stranded conductors with core end processing. The dual-terminal design facilitates the connection of two wires of different cross-sections simultaneously, enhancing wiring flexibility and reducing complexity. Installation is further streamlined by the manual operation of the latching slide, allowing for quick removal and replacement of the MCB without requiring specialized tools. Proper tightening torque, typically between 2.5 and 3.5 N·m, is crucial for ensuring secure connections and preventing thermal issues.

Operation and Risk Mitigation

The Siemens 5SY6214-7CC operates by detecting overcurrent conditions, such as overloads and short circuits, and automatically interrupting the electrical flow to prevent damage to equipment and mitigate fire hazards. The "C" tripping characteristic is designed to allow for inrush currents typically encountered with inductive loads (like motors) up to 5-10 times the rated current for a short duration, while still ensuring rapid tripping for short circuits. Risk mitigation is enhanced through integrated touch protection, which prevents accidental contact with live terminals. In industrial environments, the 5SY MCBs can be combined with additional components like auxiliary switches, fault signal contacts, shunt trips, and undervoltage releases to enhance system availability and enable remote monitoring and control. Furthermore, pairing with an arc-fault detection unit (AFDD) can provide advanced protection against fire hazards caused by arcing faults.

Scalability & Long-Term Value

The Siemens 5SY series, including the 5SY6214-7CC, offers significant long-term value through its compatibility with a broad range of Siemens SENTRON accessories. This allows for easy expansion of functionality, enabling users to adapt their protection schemes as system requirements evolve. Auxiliary switches, fault signal contacts, shunt trips, and undervoltage releases can be readily integrated, providing enhanced monitoring and control capabilities. For users looking to leverage digital transformation and the Industrial Internet of Things (IIoT), Siemens provides solutions like the SIMATIC CloudConnect gateways and Insights Hub platform. These platforms facilitate the connection of existing plants and equipment, like the 5SY MCBs, to cloud-based analytics and management systems, enabling real-time data capture, process optimization, and improved operational efficiency. This integration capability ensures that the 5SY6214-7CC remains a relevant and valuable component within modern, digitized industrial infrastructures.

Frequently Asked Questions (FAQs)

1. What is the primary function of the Siemens 5SY6214-7CC?

This miniature circuit breaker is designed to protect electrical circuits from overcurrents and short circuits. It automatically disconnects the power supply when fault conditions are detected, preventing damage.

It ensures safety for both equipment and personnel by interrupting hazardous electrical situations promptly. The device is a crucial component in electrical distribution systems.

Its specific C-curve characteristic allows for handling moderate inrush currents, making it suitable for various industrial and building applications.

2. What does the "C" tripping characteristic signify for the 5SY6214-7CC?

The C-curve indicates that the breaker will trip when the current reaches 5 to 10 times its rated current. This is ideal for inductive loads with moderate inrush currents.

It prevents nuisance tripping during brief, normal current surges, such as those from motors or lighting. However, it still provides fast protection against dangerous short circuits.

This characteristic offers a good balance between sensitivity for fault detection and tolerance for temporary overloads.

3. Can the Siemens 5SY6214-7CC be used in residential settings?

While primarily designed for industrial applications, its specifications allow for use in certain residential or commercial building installations. It's particularly useful for protecting circuits in distribution boards.

Specific applications include protecting socket outlets and lighting circuits where enhanced safety and reliability are paramount. Always ensure compliance with local electrical codes and standards.

Its robust design and safety features, like touch protection, contribute to overall system safety in any building environment.

4. What are the advantages of the Siemens SENTRON portfolio?

SENTRON products, including the 5SY6214-7CC, offer convenient installation and connection features. They are designed with uniform additional components, simplifying system design and maintenance.

The portfolio boasts a consistent design and ergonomically formed devices, enhancing user experience and operational efficiency. It provides a comprehensive range of protection devices.

Siemens' commitment to quality and innovation ensures that SENTRON devices offer reliable performance and long-term value in diverse applications.

5. How does the 5SY6214-7CC protect against electric shock?

The MCB protects against electric shock indirectly by preventing overloads and short circuits that could damage insulation. It also features integrated touch protection on its terminals.

For enhanced personal safety, it can be used in conjunction with Residual Current Devices (RCDs) or Residual Current Circuit Breakers with Overload Protection (RCBOs).

These combined devices provide direct protection against earth leakage faults, significantly reducing the risk of electric shock.

6. What is the breaking capacity of the 5SY6214-7CC and why is it important?

The breaking capacity (6 kA) is the maximum fault current the MCB can safely interrupt. A higher breaking capacity ensures the breaker can handle severe short-circuit events without being destroyed.

This rating is critical for ensuring that the breaker can safely isolate a fault before the fault current can cause damage to the circuit or system. It is a key safety parameter.

Choosing an MCB with an adequate breaking capacity for the expected fault levels at the installation point is vital for overall system protection and safety.

7. Can I connect multiple wires to a single terminal on the 5SY6214-7CC?

Yes, the 5SY6214-7CC features dual-terminal chambers at the top and bottom. This allows for the simultaneous connection of two wires, potentially of different cross-sections.

This dual-terminal design offers increased flexibility during installation and wiring, making it easier to manage connections. It also optimizes the wiring space within the terminal.

Ensure that the connected wires comply with the specified conductor cross-section limits and that the tightening torque is correctly applied.

8. What are the typical dimensions and mounting requirements for this MCB?

The 5SY6214-7CC has compact dimensions, typically around 90 mm in height, 36 mm in width, and 76 mm in depth. Its installation depth is approximately 70 mm.

It is designed for standard DIN rail mounting, which is a common and convenient method in electrical distribution boards and control panels. The snap-on fixing system allows for quick installation.

These dimensions and mounting capabilities make it easy to integrate into existing or new panel layouts, saving valuable space.

9. What is the role of the UL 1077 certification for this product?

UL 1077 certification designates the 5SY6214-7CC as a supplementary protector. This means it provides additional protection alongside a primary branch circuit protector.

Supplementary protectors are designed to trip faster than standard UL 489 breakers, offering enhanced protection for sensitive devices within a panel. They aid in selectivity.

This certification broadens the application scope, allowing the MCB to be used for specific protection needs in various industrial applications where supplementary protection is required.

10. How can this MCB integrate with Industrial IoT (IIoT) solutions?

While the MCB itself is a protective device, its integration into an IIoT ecosystem is typically facilitated by associated components and gateways. These can include auxiliary switches that signal status or gateways that collect data from the circuit.

Siemens offers Industrial IoT Gateways like SIMATIC CloudConnect that can interface with control systems where these MCBs are installed. This allows for remote monitoring of circuit status.

This enables data-driven insights, predictive maintenance, and optimization of electrical system performance through cloud-based platforms like Siemens Insights Hub.