WEIDMÜLLER VPU AC I 3+1 300/12.5 LH Type 1 Surge Arrester for TT, TN-S, TN-C-S Systems

Electrical systems face constant threats from transient overvoltages caused by lightning strikes and switching operations. Without proper protection, sensitive equipment can be damaged or destroyed, leading to costly downtime. The WEI VPU AC I 3+1 300/12.5 LH is a Type 1 surge protective device (SPD) designed to handle direct lightning strike currents with exceptional reliability, ensuring your installation remains safe and operational.

Who is it for

This surge arrester is ideal for industrial, commercial, and residential applications where protection against direct lightning strikes is critical. It is specifically suited for TT, TN-S, and TN-C-S earthing systems, making it a versatile choice for modern electrical networks. Whether you are upgrading an existing protection system or installing new equipment, the VPU AC I provides a robust first line of defense.

Main features

• Type 1 (Class I) protection: Capable of discharging partial lightning currents with 10/350 µs waveform.
• 3+1 configuration: Ensures optimal protection for three-phase systems with separate N-PE protection.
• High impulse current: Handles 12.5 kA per pole and up to 50 kA total, providing superior surge absorption.
• Advanced technology: Combines MOV (varistor) for L-N/L-PE paths and spark gap for N-PE path, balancing performance and durability.
• Visual status indication: Green/Red indicator for at-a-glance status monitoring.
• DIN rail mounting: Compact 4-pole design fits standard 35 mm rails for easy installation.

Specifications

• Surge Protection Type: Type 1 (Class I)
• Configuration: 3+1 (3-phase + N-PE)
• Max. Continuous Operating Voltage (Uc): 300 V AC (L-N/L-PE), 300 V AC (N-PE)
• Nominal Voltage (Un): 230/400 V AC
• Impulse Current (Iimp) per pole: 12.5 kA (10/350 µs)
• Total Impulse Current (Iimp): 50 kA (10/350 µs)
• Nominal Discharge Current (In): 20 kA (8/20 µs)
• Voltage Protection Level (Up): < 1.5 kV (L-N/L-PE), < 1.5 kV (N-PE)
• Response Time: < 25 ns
• Protection Technology: Varistor (MOV) for L-N/L-PE, Spark Gap (GDT) for N-PE
• Earthing Systems Supported: TT, TN-S, TN-C-S
• Mounting Type: DIN rail 35 mm
• Number of Poles: 4
• Operating Temperature Range: -40 °C to 80 °C
• Degree of Protection: IP20
• Housing Material: Thermoplastic (UL 94 V-0)
• Standards: IEC 61643-11 / EN 61643-11
• Status Indication: Visual (Green/Red)

Tips

For optimal protection, install the surge arrester as close as possible to the incoming power supply. Ensure proper earthing and follow local regulations. Periodically check the status indicator; if it turns red, replace the device to maintain protection.