Siemens 3RT5956-1CD00 Overvoltage Surge Protector Module

The Siemens 3RT5956-1CD00 overvoltage surge protector module stands as a critical component in safeguarding sensitive industrial electrical systems. This module offers robust protection against transient overvoltages, ensuring operational continuity and equipment longevity. Key advantages include its high energy absorption capability, rapid response time, and compact design suitable for various control cabinet applications. Technically, it features a nominal discharge current (In) of 20 kA and a maximum discharge current (Imax) of 40 kA, with a maximum continuous operating voltage (Uc) of 275 V AC. The module is designed for easy plug-in and removal, simplifying maintenance and replacement.

Siemens 3RT5956-1CD00: Product Specifications

| Feature                               | Specification             |

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

| Product Type                          | Overvoltage Surge Protector |

| Model Number                          | 3RT5956-1CD00             |

| Nominal Discharge Current (In)        | 20 kA                     |

| Maximum Discharge Current (Imax)      | 40 kA                     |

| Maximum Continuous Operating Voltage (Uc) | 275 V AC                  |

| Protection Level (Up)                 | ≤ 1.5 kV                  |

| Response Time                         | < 25 ns                   |

| Operating Temperature Range           | -40 °C to +70 °C          |

| Protection Class                      | IP20                      |

| Mounting Type                         | Plug-in Module            |

Core Features & Market Positioning

The Siemens 3RT5956-1CD00 distinguishes itself through its advanced surge protection technology, specifically designed for industrial environments where reliable power is paramount. Its plug-in design significantly reduces downtime during maintenance or replacement, a crucial factor in continuous industrial operations. This module's high discharge current ratings (In and Imax) indicate its capacity to handle substantial surge events, offering superior protection compared to lower-rated devices. Siemens' reputation for quality and reliability in industrial automation further solidifies the 3RT5956-1CD00's market position as a trusted solution for surge suppression.

Key Application Scenarios

This surge protector is ideal for protecting AC motor feeders, control circuits, and power distribution systems within manufacturing plants, process industries, and building automation. Its primary application is to mitigate the damaging effects of lightning-induced surges and switching transients common in industrial power grids. Specific scenarios include safeguarding motor starters, variable frequency drives (VFDs), and programmable logic controllers (PLCs) from voltage spikes that could lead to costly failures and production halts. The 3RT5956-1CD00 is a vital component in ensuring the stable operation of critical machinery and control systems.

Practical System Integration Guidance

Integrating the Siemens 3RT5956-1CD00 is straightforward due to its plug-in module design. It typically mounts onto a base unit that is wired into the main power circuit. Ensure the module is correctly seated in its base before energizing the system. The module should be installed as close as possible to the equipment it protects to maximize effectiveness. For AC motor applications, it's commonly installed in conjunction with Siemens contactors and overload relays, such as those in the 3RT series, forming a comprehensive motor protection solution. Always refer to the specific wiring diagrams provided by Siemens for your application to ensure correct interconnection and polarity.

Operation and Risk Mitigation

The 3RT5956-1CD00 operates by diverting excess voltage to ground when a surge is detected, thereby clamping the voltage to a safe level for connected equipment. Its rapid response time ensures that surges are suppressed before they can cause damage. Risk mitigation involves proper installation and regular visual inspection of the module and its base for any signs of damage or overheating. While robust, extreme surge events can potentially degrade or damage the module. It's advisable to monitor the status indicators, if available on compatible base units, and to replace the module proactively if it has experienced significant surge activity or shows signs of wear.

Scalability & Long-Term Value

The 3RT5956-1CD00 integrates seamlessly into existing Siemens industrial control platforms, such as SIMATIC S7 systems, offering excellent compatibility and long-term value. Its modular nature allows for easy replacement and potential upgrades within the Siemens protection system architecture. As industrial facilities evolve and adopt more sophisticated digital solutions, the inherent reliability and protection offered by components like the 3RT5956-1CD00 remain foundational. Its contribution to system uptime and reduced maintenance costs underscores its value proposition for any industrial operation focused on operational efficiency and equipment longevity.

Frequently Asked Questions

What is the primary function of the Siemens 3RT5956-1CD00?

Its main role is to protect electrical equipment from damaging overvoltage transients. It absorbs excess energy from surges.

This module shields sensitive components from sudden voltage spikes. It ensures reliable operation of industrial machinery.

The 3RT5956-1CD00 acts as a vital line of defense for power systems. It prevents costly equipment failures and downtime.

How is the Siemens 3RT5956-1CD00 installed?

Installation involves plugging the module into its corresponding base unit. This base unit is wired into the power circuit.

Ensure the module is securely seated before applying power. Proper wiring is crucial for effective surge suppression.

The module should be positioned as close as possible to the load it protects. Always follow Siemens' official installation guidelines.

What are the key technical specifications of this surge protector?

It features a nominal discharge current (In) of 20 kA. Its maximum discharge current (Imax) is 40 kA.

The maximum continuous operating voltage (Uc) is 275 V AC. The protection level (Up) is rated at ≤ 1.5 kV.

Its response time is less than 25 nanoseconds. It operates within a wide temperature range of -40°C to +70°C.

Can the 3RT5956-1CD00 be used in AC motor applications?

Yes, it is highly suitable for protecting AC motor feeders and their associated control circuits. It safeguards motors from damaging voltage fluctuations.

This surge protector is often integrated with Siemens contactors and overload relays. This forms a complete motor protection package.

It ensures the reliable startup and continuous operation of industrial motors. This minimizes unexpected interruptions.

What is the maximum continuous operating voltage (Uc) for this module?

The maximum continuous operating voltage is 275 volts AC. This indicates the highest voltage it can withstand continuously.

Operating below this voltage ensures the module functions correctly. Exceeding Uc can compromise its protective capabilities.

This specification is vital for selecting the right protector for your system's nominal voltage. It prevents premature failure.

What does the nominal discharge current (In) of 20 kA signify?

In signifies the current the protector can handle repeatedly. It represents a standard surge event rating.

A 20 kA rating indicates robust protection against common surges. It assures reliability in typical industrial conditions.

This value is crucial for ensuring the module's longevity and performance. It defines its capacity for recurring surges.

What is the importance of the maximum discharge current (Imax) of 40 kA?

Imax represents the highest surge current the protector can withstand once. This is for extreme events like direct lightning strikes.

A 40 kA Imax offers enhanced safety for severe surge conditions. It provides a higher level of ultimate protection.

This specification is critical for evaluating the module's resilience. It ensures safety during exceptional electrical disturbances.

How does the plug-in design benefit users?

The plug-in design allows for quick and easy replacement. This significantly reduces system downtime during maintenance.

Replacing a faulty module is a simple procedure. It minimizes the need for complex re-wiring.

This feature enhances maintainability and operational efficiency. It is a key advantage in time-sensitive industrial settings.

What is the protection level (Up) of the 3RT5956-1CD00?

The protection level (Up) is ≤ 1.5 kV. This is the maximum residual voltage that appears across the terminals when a surge occurs.

A lower Up value means better protection for connected equipment. It indicates how effectively the module clamps voltage.

This specification ensures sensitive electronics are shielded. It is a direct measure of the protection's effectiveness.

What is the response time and why is it important?

The response time is less than 25 nanoseconds. This is how quickly the module reacts to a surge.

A fast response time is crucial for effective surge suppression. It ensures the surge is diverted before damaging equipment.

Rapid reaction minimizes the impact of transient overvoltages. It safeguards components from instantaneous stress.