Siemens 5SU9326-1CN40 High Current Earth Leakage Protection Module 40A 30mA 2P C

The Siemens 5SU9326-1CN40 is a vital component for advanced electrical safety, offering robust earth leakage protection for demanding industrial environments. This 40A, 2-pole module with a 30mA sensitivity, designated by the C-curve tripping characteristic, ensures swift and reliable disconnection in the event of fault currents, safeguarding personnel and equipment. Its design prioritizes high performance and operational continuity, making it a cornerstone for modern power distribution systems requiring precise and dependable residual current detection.

Product Specifications

| Feature                 | Specification                  |

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

| Product Type            | Earth Leakage Protection Module|

| Manufacturer            | Siemens                        |

| Model Number            | 5SU9326-1CN40                  |

| Rated Current           | 40A                            |

| Sensitivity             | 30mA                           |

| Number of Poles         | 2P                             |

| Tripping Characteristic | Type C                         |

| Voltage Rating          | 230/400V AC (typical)          |

| Frequency               | 50/60 Hz                       |

| Protection Type         | AC, Pulsating DC               |

| Mounting Type           | DIN Rail                       |

Core Features & Market Positioning

The Siemens 5SU9326-1CN40 distinguishes itself through its high current carrying capacity and precise 30mA sensitivity, crucial for protecting circuits with significant load currents without nuisance tripping. Its Type C tripping curve is engineered for applications where inrush currents are common, such as those involving motors and transformers, providing a balance between sensitive fault detection and operational stability. This module is positioned as a premium solution for industrial facilities, commercial buildings, and sensitive machinery where safety and reliability are paramount. The integration of Siemens' renowned quality ensures long-term performance and compliance with stringent international safety standards, solidifying its market leadership in advanced protection devices.

Key Application Scenarios

This high-performance earth leakage protection module is ideally suited for a wide array of industrial and commercial applications. It is essential for protecting main distribution boards in factories, workshops, and manufacturing plants where heavy machinery operates. In commercial settings, it serves critical functions in server rooms, data centers, and areas housing sensitive electronic equipment that require precise fault current monitoring. Furthermore, its robustness makes it suitable for use in infrastructure projects and utility applications. The 40A rating ensures it can handle substantial loads, making it a go-to choice for circuits powering industrial motors, pumps, HVAC systems, and other significant electrical loads, thereby preventing electrical fires and protecting against electric shock.

Practical System Integration Guidance

Integrating the Siemens 5SU9326-1CN40 into existing electrical systems is straightforward due to its standard DIN rail mounting. For a 2-pole configuration, the line conductor and the neutral conductor are connected to the designated input terminals, typically marked L_in and N_in, respectively. The corresponding output terminals, L_out and N_out, feed the protected circuit. Proper grounding of the downstream equipment to the main earthing system is critical for the module's effective operation. Ensure that the incoming power supply is isolated before commencing any wiring. Following installation, a functional test should be performed by pressing the 'T' test button on the module to verify its tripping mechanism. This confirms correct installation and operational readiness.

Operation and Risk Mitigation

The primary function of the Siemens 5SU9326-1CN40 is to detect residual currents flowing to earth, which can indicate insulation failure or accidental contact with live conductors. When the measured leakage current exceeds the 30mA threshold, the module rapidly trips, disconnecting the power supply to prevent electric shock and potential fire hazards. In the event of a fault, the module will trip, and the lever will move to the 'off' position. To reset, ensure the fault condition has been rectified, then simply flip the lever back to the 'on' position. While the module itself is highly reliable, common troubleshooting involves verifying the integrity of the protected circuit's insulation and ensuring the module is correctly wired. Accidental tripping can sometimes be caused by non-fault leakage currents in systems with long cable runs or certain types of electronic equipment; understanding the system's load characteristics is key to risk mitigation.

Scalability & Long-Term Value

The Siemens 5SU9326-1CN40 is designed for integration within Siemens' broader industrial automation and power distribution ecosystems. Its compatibility with other Siemens circuit protection devices and switchgear facilitates seamless upgrades and expansions of electrical installations. While the module itself is a fixed-spec protection device, its value is amplified by its robust construction and adherence to high manufacturing standards, ensuring a long service life. For enhanced system monitoring and predictive maintenance, it can be integrated into larger smart grid or Industrial Internet of Things (IIoT) platforms through compatible upstream or downstream metering and communication devices, allowing for remote status checks and fault logging.

Frequently Asked Questions

What is the primary function of the Siemens 5SU9326-1CN40?

This module provides essential earth leakage protection, detecting fault currents to earth. It swiftly disconnects power to prevent electrical shock hazards.

It safeguards both personnel and sensitive electrical equipment from damage due to insulation failures. Its precise 30mA sensitivity ensures prompt intervention in critical situations.

The module's core purpose is to enhance overall electrical system safety and reliability in industrial and commercial settings. It is a vital safety device.

How does the 40A rating impact its applications?

The 40A rating allows this module to protect circuits with significant power demands. It is suitable for heavy industrial loads.

This makes it ideal for applications involving motors, transformers, and large machinery where higher currents are expected. It ensures uninterrupted operation during normal loads.

It offers robust protection without nuisance tripping for circuits that operate near its current limit under normal conditions. This is crucial for system uptime.

What does the 'C' in 5SU9326-1CN40 signify for tripping characteristics?

The 'C' designation indicates a Type C tripping curve, designed for circuits with moderate inrush currents. This includes applications with motors or transformers.

Type C breakers trip between 5 to 10 times the nominal current, balancing sensitive fault detection with immunity to transient surges. It prevents unnecessary shutdowns.

This characteristic ensures the module reliably protects against dangerous earth faults while accommodating the temporary current spikes inherent in certain inductive loads. It is a key differentiator.