Siemens 5SY6503-7CC Miniature Protection Circuit Breaker Switch 1P+N 3A

The Siemens 5SY6503-7CC Miniature Protection Circuit Breaker Switch, a 1P+N 3A unit, is engineered for reliable overcurrent and short-circuit protection in various electrical systems. This compact and robust device offers essential safety features for both industrial and residential applications. Its key advantages lie in its high breaking capacity, ensuring safety during fault conditions, and its compact design for efficient panel space utilization. The Siemens 5SY6503-7CC provides dependable protection with a tripping characteristic class C, suitable for inductive loads that may experience moderate inrush currents. With a rated voltage of 230V AC and a breaking capacity of 6 kA according to EN 60898, it meets stringent industry standards. The integrated neutral conductor switching enhances safety by ensuring complete disconnection.

Product Specifications

| Specification                       | Value                                           |

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

| Product Brand Name                  | SENTRON                                         |

| Product Designation                 | Miniature Circuit Breaker                       |

| Number of Poles                     | 1P+N                                            |

| Tripping Characteristic Class       | C                                               |

| Rated Current                       | 3 A                                             |

| Rated Voltage (AC)                  | 230 V                                           |

| Breaking Capacity (A 60898)   | 6 ka                   n            n      And with

| Breaking Capacity (IEC 60947-2)     | 30 kA                                           |

| Insulation Voltage (Ui)             | 250 V                                           |

| Overvoltage Category                | III                                             |

| Degree of Pollution                 | 3                                               |

| Energy Limitation Class             | 3                                               |

| Power Loss per Pole                 | 1.3 W                                           |

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

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

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

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

| Tightening Torque (screw terminals) | 2.5 - 3.5 N·m                                   |

| Installation Depth                  | 70 mm                                           |

| Dimensions (Width x Height)         | 36 mm x 90 mm                                   |

Core Features & Market Positioning

The Siemens 5SY6503-7CC stands out in the market for its robust construction and adherence to high safety standards, positioning it as a reliable choice for critical electrical protection. Its SENTRON designation signifies its integration into Siemens' comprehensive range of intelligent electrical components. The device's capability for switching the neutral conductor is a significant feature, ensuring complete isolation during maintenance or fault conditions, thereby enhancing operational safety. Furthermore, its halogen-free and silicon-free properties align with environmental and industrial safety directives, making it a preferred component in sensitive applications. The ability to install supplementary devices, such as auxiliary switches or fault signal devices, offers further customization and system integration flexibility, a key differentiator in competitive industrial settings.

Key Application Scenarios

The Siemens 5SY6503-7CC Miniature Protection Circuit Breaker Switch is ideally suited for protecting circuits in residential, commercial, and light industrial environments where reliable overcurrent protection is paramount. Its C-curve tripping characteristic makes it particularly effective for circuits supplying equipment with moderate inrush currents, such as lighting systems, socket outlets, and small motors. Common applications include distribution boards in apartment buildings, protecting individual circuits in commercial offices, and safeguarding equipment in workshops or small manufacturing facilities. The 1P+N configuration is essential for single-phase systems requiring neutral conductor protection, providing comprehensive safety for both live and neutral conductors against overloads and short circuits.

Practical System Integration Guidance

Integrating the Siemens 5SY6503-7CC into an electrical system is straightforward due to its standard modular design and clear terminal markings. Ensure the main power supply is de-energized before commencing any work. The circuit breaker accommodates conductor cross-sections from 0.75 mm² to 35 mm² for both solid and stranded wires, facilitating connection to various circuit sizes. Terminals require a tightening torque of 2.5 to 3.5 N·m for secure connections. Installation involves snapping the unit onto a standard DIN rail within a distribution board. The device features combined terminals at both the top and bottom, simplifying wiring configurations. For systems requiring remote signaling or additional control, supplementary devices can be easily attached to the side of the breaker.

Operation and Risk Mitigation

The Siemens 5SY6503-7CC operates by automatically interrupting the circuit when the current exceeds a predefined limit, thereby preventing damage to equipment and mitigating fire hazards. The C-curve characteristic means it will trip between 5 to 10 times the rated current, offering a balance between sensitivity to faults and tolerance for normal inrush currents. In case of a fault, the visible lever position indicates the tripped state. To reset the breaker, ensure the fault condition is cleared, then move the lever to the 'ON' position. The IP20 protection rating ensures touch protection against direct contact with live parts when conductors are connected. It is crucial to adhere to all local electrical codes and regulations during installation and operation.

Scalability & Long-Term Value

While the Siemens 5SY6503-7CC is a fixed-rating device, its value lies in its compatibility with Siemens' broader SENTRON product portfolio and its role in establishing a secure foundation for electrical distribution systems. The ability to integrate auxiliary devices like shunt trips or alarm switches allows for enhanced system monitoring and control, contributing to predictive maintenance strategies and potential integration with IoT platforms in the future. Its robust design ensures a long operational lifespan, minimizing the need for frequent replacements and contributing to the overall reliability and cost-effectiveness of the electrical installation. For systems requiring higher current ratings or different protection characteristics, Siemens offers a wide array of complementary circuit breakers that can be seamlessly integrated.

Frequently Asked Questions

Q1: What is the primary function of the Siemens 5SY6503-7CC?

The Siemens 5SY6503-7CC is a miniature circuit breaker designed for automatic overcurrent and short-circuit protection. It safeguards electrical circuits from damage caused by excessive current, preventing potential fires and equipment failure. This 1P+N unit specifically protects both the live and neutral conductors in single-phase systems.

Its tripping characteristic C is optimized for inductive loads, allowing for moderate inrush currents without nuisance tripping. The device offers a high breaking capacity of 6 kA, ensuring safety during fault conditions.

This circuit breaker is a crucial component in residential, commercial, and light industrial electrical installations, providing reliable and essential safety for electrical infrastructure.

Q2: What does '1P+N' mean for this Siemens circuit breaker?

'1P+N' denotes that the circuit breaker has one pole for the live conductor and an integrated pole for the neutral conductor. This configuration is designed for single-phase electrical circuits.

By switching both the live and neutral conductors simultaneously, it ensures complete isolation of the circuit. This is a critical safety feature for maintenance, preventing accidental energization through the neutral path.

The combined switching of 1P+N offers enhanced protection compared to single-pole breakers that only switch the live wire. It provides a more comprehensive safety measure in modern electrical installations.

Q3: What is the significance of the 'C' tripping characteristic?

The 'C' tripping characteristic indicates the breaker's response to current surges. It is designed to trip when the current is between 5 to 10 times the rated current (3A).

This characteristic is suitable for circuits supplying equipment with moderate inrush currents, such as lighting, socket outlets, and small electric motors. It balances protection against faults with tolerance for temporary overcurrents.

Unlike Type B breakers (3-5 times rated current) or Type D breakers (10-20 times rated current), Type C offers a versatile protection level for a wide range of common applications.

Q4: What is the breaking capacity of the Siemens 5SY6503-7CC?

The breaking capacity refers to the maximum fault current the breaker can safely interrupt. The Siemens 5SY6503-7CC has a rated short-circuit breaking capacity of 6 kA according to EN 60898.

For more demanding applications or fault scenarios, its breaking capacity according to IEC 60947-2 is rated at 30 kA. This higher rating provides robust protection in industrial environments where fault currents can be more significant.

This dual rating ensures the breaker can handle a wide range of fault levels, providing reliable protection and preventing catastrophic failures in the electrical system.

Q5: Can this circuit breaker be used in industrial control panels?

Yes, the Siemens 5SY6503-7CC is suitable for industrial control panels, particularly for protecting individual circuits. Its robust design, C-curve characteristic, and high breaking capacity make it a reliable choice.

The breaker's compatibility with supplementary devices, such as auxiliary switches or fault signal units, allows for enhanced monitoring and integration into larger industrial automation systems. Its halogen-free and silicon-free properties also meet stringent industrial safety requirements.

Proper selection based on the specific circuit's load and potential fault current is essential. Always consult the technical specifications and relevant standards for industrial applications.

Q6: What is the required conductor size for the Siemens 5SY6503-7CC?

The Siemens 5SY6503-7CC can accommodate conductor cross-sectional areas ranging from 0.75 mm² to 35 mm² for both solid and stranded wires. This broad range allows for flexibility in connecting various wire gauges commonly used in electrical installations.

It is important to use conductors that are appropriately sized for the expected load current and to ensure secure connections by adhering to the specified tightening torque of 2.5 to 3.5 N·m for the screw terminals.

Using the correct conductor size ensures efficient current flow and prevents overheating, which is crucial for the safe and reliable operation of the circuit breaker and the entire electrical system.

Q7: Is the Siemens 5SY6503-7CC suitable for DC circuits?

While primarily designed for AC circuits, the Siemens 5SY6503-7CC has a rated operating voltage of up to 60V DC and a maximum DC breaking capacity of 15 kA according to IEC 60947-2. It can be used in low-voltage DC applications with careful consideration.

However, it is essential to note that the tripping characteristics and performance of AC breakers can differ in DC circuits due to the absence of current zero crossings. It is always recommended to consult the manufacturer's documentation for specific DC application guidelines.

For dedicated DC circuit protection, using breakers specifically designed and rated for DC applications is generally advisable to ensure optimal performance and safety.

Q8: What are the dimensions of this circuit breaker?

The Siemens 5SY6503-7CC has a width of 36 mm, which corresponds to two standard modular units on a DIN rail. Its height is 90 mm, and it has an installation depth of 70 mm.

These compact dimensions are a significant advantage, especially in distribution boards and control panels where space is often limited. The modular design allows for flexible and efficient arrangement of protective devices.

The standard sizing ensures easy integration into most standard electrical enclosures and panels, making it a practical choice for electricians and panel builders.

Q9: Can this circuit breaker be sealed?

Yes, the Siemens 5SY6503-7CC is designed to be sealable. This feature is particularly useful in applications where tamper-proofing or ensuring that the breaker settings are not altered is important.

Sealing the breaker typically involves using a small wire or plastic seal through designated holes in the operating lever and housing. This provides a visual indication if the breaker has been operated or tampered with.

This capability is often utilized in utility metering, public installations, or critical industrial processes where maintaining the integrity of the protection settings is paramount.

Q10: What is the IP rating of the Siemens 5SY6503-7CC?

The Siemens 5SY6503-7CC has an IP20 protection rating when connected conductors are in place. This means it provides protection against solid objects larger than 12.5 mm (like a finger) but is not protected against water ingress.

The IP20 rating ensures touch protection for users against direct contact with live parts within the device itself, provided that the conductors are properly connected and terminated.

It is important to ensure that the overall enclosure or panel housing the circuit breaker provides the necessary environmental protection (e.g., against dust and moisture) required by the specific installation site.