Siemens 5SY6280-7CC Heavy Duty Industrial Protection Circuit Breaker 2P 80A

The Siemens 5SY6280-7CC is a robust, two-pole, 80A miniature circuit breaker designed for heavy-duty industrial applications. It offers a 6kA breaking capacity and a Type C tripping characteristic, providing reliable overcurrent and short-circuit protection. Manufactured by Siemens, a global leader in electrical engineering, this circuit breaker ensures high quality and operational safety, making it a crucial component in power distribution systems. Its compact design and durable construction are optimized for demanding industrial environments, offering a dependable solution for safeguarding electrical installations.

Product Specifications

| Feature                   | Specification                                 |

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

| Product Number            | 5SY6280-7CC                                   |

| Manufacturer              | Siemens                                       |

| Product Type              | Miniature Circuit Breaker (MCB)               |

| Number of Poles           | 2 (2P)                                        |

| Rated Current             | 80 A                                          |

| Rated Voltage             | 400 V AC                                      |

| Breaking Capacity (Icn)   | 6 kA (acc. to EN 60898)                       |

| Tripping Characteristic   | Type C                                        |

| Energy Limitation Class   | Class 3                                       |

| Overvoltage Category      | III                                           |

| Degree of Pollution       | 3                                             |

| Insulation Voltage (Ui)   | 440 V AC                                      |

| Supply Voltage Frequency  | 50/60 Hz                                      |

| Protection Class (IP)     | IP20 (with connected conductors)              |

| Mechanical Service Life   | Typically 10,000 operating cycles             |

| Operating Temperature     | -25 to 55 °C                                  |

| Net Weight                | 0.320 Kg                                      |

| Country of Origin         | China                                         |

| Product Lifecycle Status  | Active Product                                |

Core Features & Market Positioning

The Siemens 5SY6280-7CC stands out in the competitive industrial circuit breaker market due to its combination of robust construction, reliable performance, and adherence to stringent international standards. Its "heavy-duty" designation is well-earned, positioning it as a preferred choice for applications demanding high endurance and dependable protection. The Type C tripping characteristic is particularly valuable for industrial settings where equipment with moderate inrush currents, such as motors and transformers, is common. This characteristic allows for normal current operation while still providing rapid tripping for short circuits. Siemens' reputation for quality engineering and manufacturing excellence underpins the market trust in this product, ensuring it meets the rigorous demands of industrial environments. The product's active lifecycle status also signifies ongoing support and availability from the manufacturer.

Key Application Scenarios

The Siemens 5SY6280-7CC miniature circuit breaker is engineered for critical protection duties across a wide spectrum of industrial and commercial applications. Its 80A rating and 6kA breaking capacity make it ideally suited for safeguarding power circuits supplying machinery, distribution panels, control systems, and lighting circuits in manufacturing plants, workshops, and commercial buildings. This breaker is frequently specified for protecting circuits feeding inductive loads that exhibit temporary, high inrush currents during startup, such as motors, pumps, and compressors, thanks to its Type C tripping curve. It is also a staple in distribution boards for commercial facilities, ensuring the safety and continuity of power for various equipment. Its suitability for mechanical engineering and industrial applications is clearly indicated in product documentation, highlighting its resilience in demanding operational settings.

Practical System Integration Guidance

Integrating the Siemens 5SY6280-7CC into existing or new electrical systems is a straightforward process, thanks to its standardized design for modular installation devices. The breaker is designed for DIN rail mounting, which is standard in most industrial control panels and distribution boards. Wiring connections are typically made via screw terminals, which offer a secure and reliable connection for appropriate conductor sizes. While specific wiring diagrams are found in detailed product manuals, general practice involves connecting the incoming power supply to the line terminals and the outgoing load to the load terminals. It's crucial to ensure that the conductor sizes and insulation ratings are adequate for the 80A current and the system voltage. For complex systems, consulting the Siemens documentation or a qualified electrician is recommended to ensure correct phase balancing and overall system integrity. While the 5SY6280-7CC itself doesn't require programming, it is a fundamental component within larger control systems that might involve programmable logic controllers (PLCs) or other intelligent devices.

Operation and Risk Mitigation

Operating the Siemens 5SY6280-7CC involves straightforward manual actuation of the toggle switch to connect or disconnect power. Its primary function is automatic tripping in response to overcurrents or short circuits, thereby preventing equipment damage and mitigating fire hazards. The Type C tripping characteristic is designed to allow for inrush currents typical of motor startups without nuisance tripping, while still ensuring rapid disconnection during a short circuit. Risk mitigation is inherent in its design: the high breaking capacity (6kA) ensures that the breaker can safely interrupt fault currents without failing. The IP20 protection class, while standard, means that it should be installed in enclosures to protect against accidental contact with live parts and ingress of solid objects larger than 12mm. Regular visual inspections for damage and proper installation are key to maintaining operational safety. While specific fault codes are not typically associated with MCBs like the 5SY6280-7CC (as their operation is mechanical), understanding the conditions that lead to a trip (overload or short circuit) is crucial for troubleshooting.

Scalability & Long-Term Value

The Siemens 5SY6280-7CC offers excellent long-term value and fits within a scalable electrical infrastructure. As part of Siemens' extensive SENTRON product line, it benefits from a high degree of compatibility with other Siemens components, such as busbars and enclosures, facilitating system expansion or upgrades. For instance, if power requirements increase, a higher-rated breaker from the same or compatible Siemens series can be installed in the same panel space, provided the downstream wiring and system design support it. While this particular model is a traditional electromechanical device, its integration into modern industrial facilities is seamless. It serves as a foundational protection element that can be monitored indirectly through smart metering or power quality devices connected to the same distribution bus. This ensures that while the breaker provides fundamental protection, the overall system can leverage digital solutions for enhanced monitoring and data acquisition, contributing to IIoT (Industrial Internet of Things) integration strategies.

Frequently Asked Questions (FAQs)

Q1: What is the breaking capacity of the Siemens 5SY6280-7CC?

The Siemens 5SY6280-7CC has a breaking capacity of 6kA (kiloamperes) according to the EN 60898 standard. This rating indicates the maximum fault current the circuit breaker can safely interrupt without sustaining damage.

This specification is crucial for ensuring that the breaker can effectively protect electrical circuits from severe short circuits in industrial and commercial environments. A higher breaking capacity provides a greater margin of safety.

Proper system design requires that the expected short-circuit current at the breaker's location does not exceed its 6kA rating. Consulting with electrical engineers is advised for accurate system calculations.

Q2: What does the 'C' in the 5SY6280-7CC tripping characteristic mean?

The 'C' in the tripping characteristic signifies that the Siemens 5SY6280-7CC is designed for loads with moderate inrush currents. It will trip between 5 to 10 times its rated current (80A).

This characteristic makes it suitable for protecting equipment like motors, transformers, and fluorescent lighting ballasts. These devices experience a brief, high surge of current when first powered on.

A Type C breaker balances protection against overloads and short circuits with the tolerance needed for these temporary inrush currents, preventing nuisance tripping.

Q3: Can the Siemens 5SY6280-7CC be used for DC applications?

The Siemens 5SY6280-7CC is primarily designed for AC (Alternating Current) applications with a rated voltage of 400V AC. While some MCBs can be used for DC circuits, it's crucial to refer to the specific product manual.

DC circuits present different arc-quenching challenges than AC circuits. Using an AC-rated breaker on a DC circuit without proper rating or configuration can be unsafe and ineffective.

For DC applications, it is always recommended to use circuit breakers specifically designed and rated for DC use to ensure proper protection and safety.

Q4: What is the difference between 5SY6280-7CC and other Siemens circuit breakers?

The 5SY6280-7CC is a 2-pole, 80A, 6kA Type C miniature circuit breaker. Other Siemens breakers vary in pole count (1P, 3P, 4P), current rating (e.g., 10A, 32A, 63A), breaking capacity (e.g., 10kA, 15kA), and tripping characteristics (Type B, Type D).

The 'CC' in the part number typically indicates specific series or regional designations within Siemens' broad SENTRON product family. Different series offer varying levels of performance, features, and applications.

Selecting the correct breaker involves matching its specifications (poles, current, voltage, breaking capacity, tripping curve) to the specific requirements and standards of the electrical installation.

Q5: Is the Siemens 5SY6280-7CC suitable for residential use?

While the 5SY6280-7CC provides excellent protection, it is specifically marketed and designed for heavy-duty industrial applications. Its 80A rating is typically higher than what is required for most residential circuits.

Residential electrical installations generally use circuit breakers with lower current ratings (e.g., 15A, 20A) and often feature Type B or Type C characteristics suitable for household appliances and lighting.

For residential applications, it is best to select breakers that comply with local residential electrical codes and are designed for household electrical systems.

Q6: How do I install the Siemens 5SY6280-7CC circuit breaker?

Installation involves mounting the breaker onto a standard DIN rail within an electrical enclosure. Ensure the power supply to the circuit is completely de-energized before installation.

Connect the incoming power wires to the line terminals (usually at the top) and the outgoing load wires to the load terminals (usually at the bottom). Use appropriately sized conductors and ensure secure connections.

Always follow local electrical codes and manufacturer guidelines. If unsure, consult a qualified electrician to ensure safe and correct installation.

Q7: What maintenance is required for the Siemens 5SY6280-7CC?

Miniature circuit breakers like the 5SY6280-7CC require minimal routine maintenance. Periodic visual inspections for physical damage are recommended.

In industrial settings, exercising the breaker occasionally (manually switching it on and off) can help maintain contact integrity, especially if it operates infrequently.

The primary "maintenance" is ensuring it is correctly sized for the application and that the electrical system it protects is sound, preventing frequent overloads or short circuits.

Q8: Where can I find a datasheet for the Siemens 5SY6280-7CC?

Datasheets and technical documentation for the Siemens 5SY6280-7CC can typically be found on the official Siemens Industry Support portal or through authorized Siemens distributors.

Websites like RS Online, Okmarts.com, and Siemens' own SiePortal often provide access to product specifications and downloadable PDF datasheets.

Searching online using the exact product number "Siemens 5SY6280-7CC datasheet" will yield relevant links to these resources.

Q9: What is the operating temperature range for this circuit breaker?

The Siemens 5SY6280-7CC is designed to operate within a temperature range of -25 to 55 degrees Celsius. This wide range accommodates many industrial environments.

Operating outside this specified temperature range can affect the performance and lifespan of the circuit breaker. Extreme cold might impact mechanical function, while excessive heat can lead to derating.

Ensuring proper ventilation in electrical enclosures where the breaker is installed is essential to maintain the ambient temperature within these limits.

Q10: Can this circuit breaker be used with other brands of electrical components?

The Siemens 5SY6280-7CC is designed to be compatible with standard DIN rail mounting systems and electrical wiring practices. It can often be integrated into panels with components from other manufacturers.

However, for optimal performance, reliability, and to ensure compliance with safety standards, it is generally recommended to use components from the same manufacturer or those explicitly certified for compatibility.

Specific considerations for compatibility, especially with protection coordination (selectivity), should be reviewed by a qualified electrical engineer.