Siemens 5SU9326-1CN32 Industrial Safety Protection Module 32A 30mA 2P C

The Siemens 5SU9326-1CN32 is a high-performance industrial safety protection module designed for robust electrical system safeguarding. This 2-pole, 32A, 30mA residual current device (RCD) with a Type C tripping curve offers superior protection against earth leakage faults and indirect contact in demanding industrial environments. Its compact design and advanced tripping characteristics ensure operational continuity and personnel safety, making it a critical component in modern electrical installations.

Product Specifications

| Feature                        | Specification                                    |

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

| Product Type                   | Residual Current Device (RCD)                    |

| Manufacturer                   | Siemens                                          |

| Model Number                   | 5SU9326-1CN32                                    |

| Number of Poles                | 2P                                               |

| Rated Current (In)             | 32A                                              |

| Rated Residual Current (IΔn)   | 30mA                                             |

| Tripping Curve Type            | Type C                                           |

| Rated Voltage (Un)             | 230/400V AC                                      |

| Frequency                      | 50/60 Hz                                         |

| Breaking Capacity (Icn)        | 10kA                                             |

| Terminal Type                  | Screw Terminals                                  |

| Mounting Type                  | DIN Rail                                         |

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

| Protection Class               | IP20                                             |

| Compliance Standards           | IEC/EN 61009-1, IEC/EN 61009-2-1, IEC/EN 60947-2 |

Core Features & Market Positioning

The Siemens 5SU9326-1CN32 distinguishes itself through its Type C tripping characteristic, which provides enhanced protection against transient overcurrents and surges common in industrial settings with inductive loads, such as motors and transformers. This feature minimizes nuisance tripping while maintaining crucial safety against residual currents. Its high breaking capacity of 10kA ensures reliable operation even under fault conditions, safeguarding connected equipment and personnel. The 30mA sensitivity is ideal for personal protection against electric shock. Positioned as a premium safety solution, this module integrates seamlessly into Siemens' broader industrial control and protection portfolio, offering a reliable and future-proof choice for discerning engineers and system integrators.

Key Application Scenarios

This Siemens RCD is exceptionally well-suited for protecting circuits in industrial machinery, control panels, pump stations, and manufacturing lines where inductive loads are prevalent. Its application extends to areas requiring robust protection against earth faults and indirect contact, such as in food and beverage processing plants, chemical facilities, and heavy industry. The 2P configuration is ideal for single-phase circuits, providing a reliable barrier against electrical hazards for equipment operating on 230V AC. Furthermore, it's a critical component for ensuring compliance with stringent electrical safety regulations in commercial and industrial buildings.

Practical System Integration Guidance

Installing the Siemens 5SU9326-1CN32 is straightforward, utilizing standard 35mm DIN rail mounting. Ensure the module is de-energized before wiring. Connect the live (L) and neutral (N) conductors of the protected circuit to the corresponding input terminals, typically marked with an arrow indicating current flow. The output terminals then feed the protected load. Proper grounding of the installation is paramount for the RCD's effective operation. For circuits exceeding 32A, or where higher fault currents are anticipated, consult the relevant electrical codes and consider upstream overcurrent protection devices like miniature circuit breakers (MCBs) with appropriate ratings to work in conjunction with this RCD.

Operation and Risk Mitigation

The 5SU9326-1CN32 operates by continuously monitoring the balance of current flowing through the live and neutral conductors. If an imbalance exceeding 30mA occurs, indicating a fault to earth, the module rapidly disconnects the circuit, mitigating the risk of electric shock and fire. Regular testing using the integrated test button is crucial for verifying functionality; press the button under load to simulate a fault and confirm tripping. Persistent tripping may indicate a persistent earth fault in the connected equipment or wiring, requiring immediate investigation and rectification to prevent potential hazards and downtime.

Scalability & Long-Term Value

As part of the Siemens SENTRON series, the 5SU9326-1CN32 offers excellent compatibility with other Siemens protection and switching devices, facilitating straightforward integration into existing or expanding electrical systems. This ensures future scalability and adaptability to evolving industrial needs. Its robust construction and adherence to international standards guarantee long-term reliability and performance, minimizing the need for premature replacement. For advanced applications, its inclusion within a comprehensive smart grid or IIoT-enabled infrastructure allows for remote monitoring and diagnostics when paired with appropriate communication gateways and software solutions.

Frequently Asked Questions

What is the primary function of the Siemens 5SU9326-1CN32?

This module serves as a residual current device (RCD) for robust electrical safety. It protects against earth leakage faults and indirect contact.

It ensures personnel safety by rapidly disconnecting power during fault conditions. This RCD is vital for preventing electric shocks and fires.

The Siemens 5SU9326-1CN32 is designed for industrial applications with inductive loads. It offers reliable protection in demanding environments.

How does the Type C tripping curve benefit industrial applications?

Type C curves are designed for circuits with inductive loads. These loads can cause temporary overcurrents upon switching on.

The Type C characteristic allows for higher inrush currents without nuisance tripping. This maintains operational continuity for machinery.

It still provides sensitive protection against residual currents, balancing performance with safety. This makes it ideal for motors and transformers.

What type of protection does 30mA residual current offer?

A 30mA residual current rating is considered safety protection. It is sensitive enough to prevent serious harm from electric shock.

This level of sensitivity protects individuals from dangerous current paths through the body. It is crucial for preventing electrocution.

It significantly reduces the risk of secondary injuries caused by involuntary muscle contractions. This ensures immediate disconnection when it matters most.

Can the Siemens 5SU9326-1CN32 be used for single-phase and three-phase circuits?

This specific model, the 5SU9326-1CN32, is a 2-pole device. It is designed for single-phase (L+N) circuits.

For three-phase applications, a 4-pole RCD would be required. Ensure correct pole configuration for your circuit's power supply.

Always verify the voltage and current requirements of your circuit to select the appropriate RCD. Using the correct device is essential for safety and compliance.

What is the breaking capacity of this RCD?

The Siemens 5SU9326-1CN32 has a breaking capacity of 10kA. This indicates its ability to safely interrupt fault currents.

A high breaking capacity is crucial in industrial settings. It prevents damage to the RCD and connected equipment during severe faults.

This 10kA rating ensures reliable performance under short-circuit conditions. It meets stringent safety standards for industrial electrical systems.

How should I test the functionality of the 5SU9326-1CN32?

Regularly use the integrated test button on the front of the module. Pressing this button simulates an earth fault.

When the test button is pressed, the RCD should trip and disconnect the power. This confirms that the internal mechanism is functioning correctly.

It is recommended to test the RCD monthly as part of routine maintenance. If it fails to trip, it must be replaced immediately.

What are the environmental considerations for installing this module?

The module is rated for an operating temperature range of -25°C to +45°C. Avoid extreme temperatures outside this range.

It has an IP20 protection class, meaning it is protected against solid objects larger than 12.5mm. It is not protected against water ingress.

Ensure the installation location is dry and protected from direct exposure to dust, moisture, or corrosive substances to maintain performance and longevity.

Is this RCD compatible with Siemens' broader product lines?

Yes, the 5SU9326-1CN32 is part of the Siemens SENTRON protection devices. It is designed for seamless integration.

This compatibility allows for easy expansion and cohesive system design with other Siemens components. It simplifies project planning and execution.

It integrates well with other modular devices on a standard DIN rail, ensuring flexibility in panel design. This makes it a versatile choice for Siemens ecosystems.

What does 'residual current' refer to in this context?

Residual current is the difference between the current flowing into a circuit and the current returning. It indicates current leaking to earth.

This leakage can occur through faulty insulation or accidental contact with live parts. It is a primary indicator of an electrical hazard.

The RCD detects this imbalance and interrupts the circuit to prevent dangerous current flow. It is the core principle of RCD safety operation.

Where is the best place to install this module within an electrical panel?

Install the RCD on a standard 35mm DIN rail within the electrical panel. Ensure it is securely fastened.

Typically, it is placed after the main incoming power supply and any main circuit breakers. It should precede the distribution of power to the protected circuits.

Ensure adequate space and ventilation around the module for proper heat dissipation and accessibility for testing and maintenance.