Siemens 5SN6225-7CN Miniature Circuit Breaker 2P 25A

Siemens 5SN6225-7CN Miniature Circuit Breaker: Robust Protection for Industrial Applications

The Siemens 5SN6225-7CN Miniature Circuit Breaker (MCB) is engineered for dependable circuit protection, offering a robust solution for both residential and commercial environments. This 2-pole device boasts a 25A current rating and a 6kA breaking capacity, ensuring effective safeguarding against overcurrents and short circuits. Its Type C tripping characteristic is optimized for applications with moderate inrush currents, making it a versatile choice for a range of electrical installations. Designed for straightforward DIN rail mounting, the 5SN6225-7CN integrates seamlessly into standard electrical panels.

Product Specifications

| Parameter                           | Specification                                 |

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

| Manufacturer                        | Siemens                                       |

| Product Designation                 | Miniature Circuit Breaker (MCB)               |

| Model Number                        | 5SN6225-7CN (or similar variants like 5SL6225-7, 5SY6225-7) |

| Number of Poles                     | 2P (Double Pole)                              |

| Rated Current (In)                  | 25A                                           |

| Rated Voltage (Ue)                  | 400V AC                                       |

| Breaking Capacity (Icn)             | 6kA (according to IEC/EN 60898-1)             |

| Tripping Characteristic             | Type C                                        |

| Mounting Type                       | DIN Rail                                      |

| Built-in Depth                      | 70 mm                                         |

| Degree of Protection (IP)           | IP20 (with connected conductors)              |

| Ambient Temperature (Operating)     | -25°C to 55°C                                 |

| Connectable Conductor Cross-Section | 0.75 mm² to 35 mm² (solid/stranded)           |

| Tightening Torque (Terminals)       | 2.5 N·m to 3.5 N·m                            |

| Standards Compliance                | IEC/EN 60898-1, IEC/EN 60947-2                |

Core Features & Market Positioning

The Siemens 5SN6225-7CN MCB stands out due to its German engineering and adherence to stringent international standards, such as IEC/EN 60898-1 and IEC/EN 60947-2. Its 6kA breaking capacity offers reliable protection for standard applications, while the Type C tripping characteristic provides a good balance for inductive loads common in industrial settings. The 2-pole configuration is essential for providing complete protection in single-phase systems, including safeguarding the neutral conductor. This combination of features positions the 5SN6225-7CN as a dependable and cost-effective solution for electrical distribution and protection, emphasizingSiemens' reputation for quality and performance in the low-voltage switchgear market.

Key Application Scenarios

This Siemens miniature circuit breaker is ideally suited for protecting circuits in residential buildings, commercial establishments, and light industrial facilities. Its 25A rating and Type C curve make it particularly effective for circuits supplying motors, transformers, and lighting systems where moderate inrush currents are expected. Common applications include load distribution panels, sub-distribution boards, and as a dedicated protective device for individual appliances or machinery requiring precise overcurrent protection. The 2-pole design ensures complete isolation of both live and neutral conductors, enhancing safety during maintenance.

Practical System Integration Guidance

Installation of the Siemens 5SN6225-7CN MCB is designed for efficiency. The unit mounts directly onto a standard 35mm DIN rail, facilitated by tool-free assembly and disassembly mechanisms. For secure electrical connections, use conductors within the specified cross-sectional range (0.75 mm² to 35 mm² for solid or stranded wire) and ensure proper tightening of the terminal screws to the recommended torque range of 2.5 to 3.5 N·m. The rear busbar connection simplifies wiring for infeed, contributing to a tidy and organized electrical panel layout. Always ensure the power supply is de-energized before commencing any installation or wiring work.

Operation and Risk Mitigation

Proper operation of the Siemens 5SN6225-7CN MCB relies on understanding its tripping mechanism. The Type C characteristic is designed to tolerate inrush currents up to 5 to 10 times the rated current, preventing nuisance tripping, while still providing rapid protection against short circuits. In the event of a fault, the breaker will trip, interrupting the circuit. To reset, first identify and rectify the cause of the overload or short circuit, then manually reset the breaker. The device is designed with IP20 protection, meaning it safeguards against solid objects larger than 12mm but requires enclosure for protection against water or dust ingress. Adherence to proper load limits and system voltage is crucial for safe and reliable operation.

Scalability & Long-Term Value

The Siemens 5SN6225-7CN MCB is part of the broader Siemens SENTRON protection device portfolio, which offers extensive compatibility and scalability. This breaker can be complemented with various accessories, such as auxiliary switches or signal modules, allowing for expanded functionality and integration into more complex control systems. Its robust construction and adherence to industry standards ensure a long operational lifespan. While direct digital integration capabilities for this specific model are not explicitly detailed, Siemens' commitment to industrial digitalization through platforms like Insights Hub and Industrial Operations X means that future system upgrades or transitions to smart grid technologies can often incorporate existing SENTRON components. This approach supports a phased digitalization strategy, maximizing the long-term value of electrical infrastructure investments.

Frequently Asked Questions (FAQs)

Q1: What is the primary function of the Siemens 5SN6225-7CN MCB?

The Siemens 5SN6225-7CN acts as an essential safety device. It automatically interrupts electrical circuits when overcurrents occur, preventing damage.

This breaker protects equipment from thermal and magnetic fault conditions. It ensures operational safety in various installations.

Its primary role is to safeguard against overloads and short circuits. This minimizes fire hazards and equipment failure risks.

Q2: Can the Siemens 5SN6225-7CN MCB be used for motor protection?

Yes, the Type C tripping characteristic is suitable for motors. It handles moderate inrush currents during startup.

This breaker provides a balance between protection and nuisance tripping. It is a common choice for many motor applications.

For critical motor protection, consider specialized motor protection relays or devices with adjustable settings. However, for general use, it is adequate.

Q3: What is the breaking capacity of the Siemens 5SN6225-7CN?

The Siemens 5SN6225-7CN has a breaking capacity of 6kA. This rating applies according to IEC/EN 60898-1 standards.

A 6kA rating means it can safely interrupt fault currents up to this level. It is suitable for most standard residential and commercial applications.

For areas with higher prospective fault currents, a higher breaking capacity breaker may be necessary. Always check system fault current levels.

Q4: How do I install the Siemens 5SN6225-7CN MCB on a DIN rail?

This MCB mounts easily onto a standard 35mm DIN rail. It features tool-free assembly for quick installation.

Ensure the circuit is de-energized before mounting. The breaker simply clips onto the rail, typically from the bottom upwards.

Secure the wiring to the terminals with the specified torque. This ensures a reliable and safe electrical connection.

Q5: What does the "2P" in the product name signify for the 5SN6225-7CN?

"2P" indicates that the circuit breaker has two poles. This means it protects two conductors simultaneously.

It is designed for single-phase circuits where both live and neutral need protection. This offers enhanced safety over single-pole breakers.

These double-pole breakers are crucial for isolating circuits completely during maintenance. They ensure no voltage remains on the circuit.

Q6: Can the Siemens 5SN6225-7CN be used in high-temperature environments?

The breaker is rated for operation between -25°C and 55°C. Exceeding this range can affect performance and lifespan.

High ambient temperatures can lead to derating of the circuit breaker. This means its effective current carrying capacity may be reduced.

Always ensure adequate ventilation around the breaker. Avoid installing in locations with extreme heat exposure.

Q7: What are the wire connection requirements for the 5SN6225-7CN?

It accepts solid or stranded conductors from 0.75 mm² up to 35 mm². Always strip wires to the correct length.

Use a screwdriver to tighten the terminal screws securely. The recommended torque is between 2.5 and 3.5 N·m for optimal contact.

Ensure the conductor is fully inserted into the terminal. Loose connections can cause overheating and pose a safety risk.

Q8: Is the Siemens 5SN6225-7CN compatible with other Siemens SENTRON devices?

Yes, it is part of the Siemens SENTRON protection device family. This ensures broad compatibility.

It can be used alongside other SENTRON breakers, fuses, and distribution components. This facilitates a unified electrical system design.

Accessories like auxiliary switches can often be added. This extends the breaker's functionality within the SENTRON ecosystem.

Q9: What is the IP rating of the Siemens 5SN6225-7CN?

The IP rating is IP20 when conductors are connected. This means it is protected against solid objects larger than 12mm.

IP20 protection does not guard against water ingress. The device should be installed in an enclosure for adequate protection.

Ensure the enclosure provides sufficient protection against dust and moisture for the installation environment.

Q10: Can this MCB be integrated into an IIoT system?

Direct IIoT integration is not a standard feature of this MCB model. It's a traditional protective device.

Siemens offers IIoT platforms like Insights Hub for broader system monitoring. Integration often requires external smart devices or gateways.

These platforms can collect data from compatible switchgear for analysis and optimization. Check Siemens' IIoT solutions for integration possibilities.