Siemens 5SD7464-1 Type 2 Surge Arrester 4P 20kA 350V 3+1 TN-S with Signaling Contacts

The Siemens 5SD7464-1 is a high-performance Type 2 surge arrester engineered to provide robust protection for electrical installations against transient overvoltages. Designed specifically for 3+1 TN-S network configurations, this 4-pole device effectively diverts excess energy to ground, safeguarding sensitive electronic equipment and infrastructure. With a discharge capacity of 20kA and an operating voltage of 350V, it offers a reliable solution for maintaining electrical system integrity in both residential and industrial environments.

Advantages

This surge arrester stands out due to its integrated signaling contacts, which allow for real-time status monitoring and remote notification of the device's operational state. Its compact 4-pole design facilitates easy integration into standard distribution boards, while the high-quality construction ensures long-term durability and consistent performance under varying electrical conditions. By mitigating the risks associated with voltage spikes, it significantly reduces the likelihood of equipment damage and downtime.

Suitable for

• Residential electrical distribution boards
• Industrial automation and control systems
• Commercial building power protection
• TN-S earthing system installations

When it may not be suitable

This device is specifically designed for TN-S systems and may not be compatible with other earthing configurations without appropriate modifications. It is not intended for use as a primary lightning protection system in areas with high direct strike exposure, where Type 1 arresters are required.

Key specifications

• Type: 2 surge arrester
• Configuration: 4-pole (3+1)
• System compatibility: TN-S
• Discharge capacity: 20kA
• Operating voltage: 350V
• Features: Integrated signaling contacts
• Weight: 429 g

How to use

The device should be installed by a qualified electrician within the main distribution board or sub-distribution panel. It is mounted onto a standard DIN rail. The connections must be made according to the wiring diagram for 3+1 TN-S systems, ensuring that the phase, neutral, and protective earth conductors are correctly terminated. The signaling contacts can be wired to a monitoring system or an alarm indicator to provide immediate feedback on the status of the protection modules.

What to consider before purchase

• Verify that your electrical system is a 3+1 TN-S configuration
• Ensure there is sufficient space on the DIN rail in your distribution board
• Check if your monitoring system is compatible with the integrated signaling contacts
• Confirm that the operating voltage matches your local grid requirements

Usage recommendations: Regularly inspect the status indicator on the device to ensure the protection modules are functional. If the signaling contact triggers an alarm, replace the affected protection module immediately to maintain continuous system safety.