Siemens 5SU9326-1CN25 Medium Current Earth Leakage Protection Module 25A 30mA 2P C

The Siemens 5SU9326-1CN25 is a 2-pole, 25A, 30mA earth leakage protection module designed for robust safety in industrial and commercial electrical systems. This Residual Current Device (RCD) offers essential protection against indirect contact and fire hazards caused by insulation failures. Its key advantages include high breaking capacity, Type A tripping characteristics for detecting pulsating AC and pulsating DC fault currents, and a compact design for efficient panel space utilization. Critical technical parameters include a rated voltage of 230/400V AC, a tripping current of 30mA, and a rated current of 25A, with a tripping curve designation of Type C.

Product Specifications

| Parameter                   | Value                               |

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

| Product Type                | Earth Leakage Protection Module     |

| Manufacturer                | Siemens                             |

| Model Number                | 5SU9326-1CN25                       |

| Poles                       | 2                                   |

| Rated Current               | 25A                                 |

| Rated Sensitivity Current   | 30mA                                |

| Rated Voltage               | 230/400V AC                         |

| Tripping Characteristic     | Type A                              |

| Tripping Curve              | Type C                              |

| Breaking Capacity (Icn)     | 10kA                                |

| Frequency                   | 50/60 Hz                            |

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

| Protection Class (IP)       | IP20                                |

| Mounting Type               | DIN Rail                             |

Core Features & Market Positioning

The Siemens 5SU9326-1CN25 distinguishes itself through its Type A tripping characteristic, which provides enhanced protection compared to Type AC devices, as it can detect both AC and pulsating DC residual currents. This makes it highly suitable for modern installations with electronic equipment that can generate such fault currents. Its robust construction and 10kA breaking capacity ensure reliable operation even under fault conditions, positioning it as a dependable safety component in demanding environments. The module's integration into the Siemens SENTRON portfolio signifies its compatibility with a wider range of Siemens protection and switching devices, offering system integrators a cohesive and high-quality solution.

Key Application Scenarios

This earth leakage protection module is crucial for safeguarding circuits in commercial buildings, residential complexes, and various industrial settings. It is particularly vital in areas where the risk of electrical shock is elevated, such as control cabinets, distribution boards, and machine control panels. The 30mA sensitivity is ideal for personal protection, preventing serious injury from contact with live parts due to insulation faults. Applications include protecting lighting circuits, socket outlets, and equipment powered by sensitive electronics that might generate DC fault components.

Practical System Integration Guidance

Integrating the Siemens 5SU9326-1CN25 into existing electrical systems is straightforward due to its standard DIN rail mounting. The module connects in series with the protected circuit, typically placed after the main circuit breaker and before the downstream loads. Correct wiring is paramount: the line and neutral conductors of the protected circuit must pass through the module's designated terminals. For 2-pole operation, ensuring the neutral conductor is correctly terminated is critical for proper earth leakage detection. Referencing the wiring diagram on the product label or in the accompanying manual is recommended to confirm polarity and terminal assignments, ensuring optimal safety and functionality.

Operation and Risk Mitigation

The 5SU9326-1CN25 operates by continuously monitoring the current flowing through the live and neutral conductors of a circuit. If an imbalance is detected, indicating that current is leaking to earth, the module rapidly disconnects the power supply, mitigating the risk of electric shock and fire. In case of a fault, the module's toggle will trip to the "OFF" position. To reset, ensure the fault condition has been cleared, then manually switch the toggle back to the "ON" position. Common troubleshooting involves checking for persistent earth faults in the connected equipment or wiring.

Scalability & Long-Term Value

As part of the Siemens SENTRON series, the 5SU9326-1CN25 offers excellent compatibility with other SENTRON components, such as miniature circuit breakers and power distribution blocks. This allows for the creation of integrated and scalable protection systems. Its robust design ensures a long service life, contributing to lower long-term maintenance costs. For facilities looking towards digitalization, this module can be part of a larger smart electrical infrastructure when combined with appropriate monitoring and communication devices, enabling remote status checks and early fault detection.

FAQs

1. What is the primary function of the Siemens 5SU9326-1CN25?

This module provides essential earth leakage protection. It detects imbalances in current flow. This prevents electric shock and fire hazards.

It safeguards personnel and property from electrical faults. The device trips quickly when leakage is detected. It interrupts the power supply to the affected circuit.

The Siemens 5SU9326-1CN25 is crucial for compliance. It meets safety standards for electrical installations. It ensures a secure electrical environment.

2. What does "25A 30mA 2P C" mean in the product name?

"25A" indicates the maximum continuous current it can handle. "30mA" is the residual current sensitivity. This is the leakage current that triggers the device.

"2P" signifies that it is a 2-pole device. It protects both the live and neutral conductors. This ensures complete circuit isolation upon tripping.

"C" refers to the tripping curve characteristic. It defines the overcurrent at which the device will trip. Type C is suitable for inductive loads.

3. What types of fault currents can the 5SU9326-1CN25 detect?

The 5SU9326-1CN25 is a Type A RCD. It detects sinusoidal AC residual currents. It also detects pulsating DC residual currents.

This capability is vital for modern electronics. Many devices generate pulsating DC fault currents. Type A offers broader protection than Type AC RCDs.

It ensures enhanced safety where sensitive equipment is used. This includes IT equipment, power supplies, and variable speed drives.

4. How is the 5SU9326-1CN25 installed in an electrical panel?

Installation requires mounting it on a standard DIN rail. The module is designed for vertical or horizontal mounting. Ensure secure attachment to the rail.

Wiring involves connecting the incoming live and neutral wires. These go to the designated input terminals. The outgoing protected circuit wires connect to the output terminals.

Always disconnect power before installation. Follow the wiring diagram precisely. Incorrect wiring can compromise safety and functionality.

5. What is the difference between Type A and Type AC RCDs?

Type AC RCDs only detect sinusoidal AC residual currents. They are suitable for basic applications with simple loads. They offer fundamental protection against earth faults.

Type A RCDs offer enhanced protection. They detect sinusoidal AC and pulsating DC residual currents. This is crucial for circuits with electronic components.

The 5SU9326-1CN25, being Type A, provides superior safety. It addresses a wider range of fault scenarios. It is recommended for modern installations.

6. Can this module be used for personal protection?

Yes, the 30mA tripping current is specifically for personal protection. It is sensitive enough to prevent severe electric shock. It significantly reduces the risk of electrocution.

This sensitivity level is a standard requirement. It is mandated for socket outlets and accessible circuits. It ensures a safe environment for people.

By rapidly disconnecting power, it minimizes harm. It is a critical safety component in homes and workplaces.

7. What does a 10kA breaking capacity mean?

A 10kA breaking capacity indicates the maximum fault current. The module can safely interrupt this current without damage. It ensures the device remains functional after a significant fault.

This high breaking capacity is essential. It protects downstream components. It prevents cascading failures in the electrical system.

It signifies robustness. This makes the 5SU9326-1CN25 suitable for demanding industrial environments.

8. How do I reset the Siemens 5SU9326-1CN25 after it trips?

First, identify and rectify the cause of the earth fault. The module will not reset if the fault persists. Ensure all connected equipment is functioning correctly.

Once the fault is cleared, manually push the toggle switch upwards. This will re-energize the protected circuit. A clear "ON" indication should be visible.

If the module trips repeatedly, investigate further. Consult a qualified electrician if the issue is not apparent. Continuous tripping indicates an ongoing problem.

9. Is the 5SU9326-1CN25 compatible with other brands of circuit breakers?

While it can be wired into circuits protected by other brands, full compatibility is best within the Siemens SENTRON system. This ensures optimal performance and integration. Mixed brand installations may require careful verification.

Using components from the same manufacturer often simplifies installation. It also guarantees consistent performance characteristics. This is especially true for protection coordination.

For critical applications, using a complete Siemens solution is recommended. This ensures all components work together seamlessly for maximum safety.

10. What are the typical applications for a 2P C-Type RCD like this?

It's ideal for protecting circuits with mixed loads. This includes lighting, sockets, and some motor loads. The Type C characteristic handles moderate inrush currents.

Common use cases are in residential and commercial buildings. It provides essential shock protection for general circuits. It ensures safety in distribution boards.

The 2-pole design ensures complete isolation. This is important for maintaining safety during maintenance. It's a versatile protective device.