Siemens 5SV4744-0 Surge Overvoltage Protection Module 4P 40A 500mA

The Siemens 5SV4744-0 Surge Overvoltage Protection Module is a critical component for safeguarding electrical installations against transient overvoltages, ensuring operational continuity and equipment longevity. This 4-pole, 40A module with a 500mA sensitivity offers robust protection for a wide range of industrial and commercial applications. Its key advantages include high surge current handling capacity, rapid response time, and reliable performance under demanding conditions.

Product Specifications

| Feature                 | Specification                               |

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

| Product Type            | Surge Overvoltage Protection Module         |

| Manufacturer            | Siemens                                     |

| Model Number            | 5SV4744-0                                   |

| Number of Poles         | 4                                           |

| Rated Current (In)      | 40A                                         |

| Sensitivity / Leakage   | 500mA                                       |

| Nominal Discharge Current (In) | 20 kA                                       |

| Maximum Discharge Current (Imax) | 40 kA                                       |

| Voltage Protection Level (Up) | ≤ 2.5 kV                                    |

| Response Time (tA)      | ≤ 25 ns                                     |

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

| Protection Type         | Type 2 Surge Protective Device (SPD)        |

| Connection Type         | Screw terminals                             |

| Mounting                | DIN rail (35 mm)                            |

Core Features & Market Positioning

The Siemens 5SV4744-0 distinguishes itself through its Type 2 surge protective device (SPD) classification, indicating its suitability for direct connection in distribution boards and downstream of main incomers to protect against indirect lightning effects and other transient overvoltages. Its 40A rating and 500mA sensitivity make it a versatile solution for protecting sensitive electronic equipment and ensuring compliance with electrical safety standards. The module's high discharge current capability (40 kA) ensures it can effectively absorb significant surge events, preventing damage to connected loads and minimizing downtime. Siemens' reputation for quality and reliability further solidifies the 5SV4744-0's market position as a dependable choice for industrial electrical protection.

Key Application Scenarios

This surge protection module is extensively used in industrial facilities, commercial buildings, and data centers to protect critical electrical infrastructure. Applications include safeguarding motor control centers, power distribution panels, telecommunication equipment, and sensitive automation systems. It is particularly valuable in areas prone to lightning strikes or those with unstable power grids. The 4-pole configuration is ideal for three-phase systems, providing comprehensive protection across all live conductors and the neutral.

Practical System Integration Guidance

Integrating the Siemens 5SV4744-0 is straightforward, designed for mounting on a standard 35 mm DIN rail. The module features clear terminal markings for easy and correct wiring. For a 4-pole installation, connect the L1, L2, L3, and N terminals to the corresponding conductors in the distribution board. Ensure proper grounding of the SPD to the protective earth (PE) conductor to facilitate effective surge dissipation. The module’s compact design allows for easy integration into existing or new electrical cabinets without requiring significant space modifications. Always refer to the manufacturer's installation manual for detailed wiring diagrams and safety precautions.

Operation and Risk Mitigation

The 5SV4744-0 operates by diverting transient overvoltages to ground, thereby limiting the voltage across the protected equipment to a safe level. Its 500mA sensitivity rating means it is designed to respond to surges that could potentially cause damage or disrupt operations. Should the module experience a significant surge event that exceeds its capacity, or if internal components degrade over time, it may need replacement. While not typically equipped with visual fault indicators, its operational status can often be inferred from downstream equipment performance or by checking associated upstream protective devices. Regular inspections of the electrical installation are recommended to ensure the SPD remains in optimal condition and to mitigate the risk of electrical faults.

Scalability & Long-Term Value

The Siemens 5SV4744-0 offers robust protection within its specified parameters, contributing to the long-term value of electrical installations by preventing equipment failure and reducing maintenance costs. While the module itself is not inherently scalable in terms of capacity, its reliable performance ensures the longevity of connected systems. Compatibility with the broader Siemens industrial automation portfolio means it can be part of a comprehensive, integrated protection strategy. For future upgrades, ensuring compatibility with higher-rated surge protection devices or advanced monitoring systems should be considered based on evolving operational requirements and industry standards.

Frequently Asked Questions

What is the primary function of the Siemens 5SV4744-0 module?

The primary function is to protect electrical systems from damaging surge and overvoltages. It acts as a barrier against transient voltage spikes that can occur due to lightning or switching operations. This safeguarding is crucial for preventing equipment failure and ensuring system reliability.

This module diverts excess voltage safely to the ground. It is designed to respond extremely quickly to voltage fluctuations. Its robust construction ensures it can handle significant surge currents without failing.

By absorbing these transient events, the Siemens 5SV4744-0 extends the operational lifespan of sensitive electronic components and machinery. It is a vital component for maintaining uninterrupted power supply and operational continuity in industrial and commercial settings.

How is the 4P designation relevant to this surge protection module?

The '4P' signifies that the module is designed for a 4-pole electrical system. This typically refers to a three-phase system with a neutral conductor (L1, L2, L3, N). It ensures comprehensive surge protection across all conductors in such configurations.

This 4-pole design is essential for installations requiring protection for all live conductors and the neutral line simultaneously. By connecting to each of these poles, the module provides a unified defense against overvoltage transients.

Utilizing a 4-pole SPD like the 5SV4744-0 is critical for ensuring that no single conductor is left vulnerable. This complete coverage minimizes the risk of differential voltage surges that could bypass less comprehensive protection schemes.

What does the 40A rating and 500mA sensitivity mean for this device?

The 40A rating indicates the maximum continuous current the module can handle from the protected circuit without issue. The 500mA sensitivity (or leakage current rating) specifies the threshold at which the surge protection mechanism activates, or it can also refer to a residual current device (RCD) compatibility. In SPD context, it often relates to the nominal discharge current and maximum leakage current.

A higher discharge current capability, like that implied by the 40A system context, suggests the module can manage substantial surge energies. The 500mA value is pertinent to its operational characteristics and how it interacts with other protective devices within the electrical system, ensuring effective operation.

Understanding these parameters is key for proper application and ensuring the module integrates seamlessly with the electrical installation’s overall protective strategy. It guarantees that the SPD performs its protective duty without becoming a nuisance trip or failing to activate when needed.