Weidmüller VPU ZPA S I 3+1 300/7.5 Type 1 Surge Protective Device

With an impulse current rating of 7.5 kA per pole (10/350 µs) and a total discharge capacity of 30 kA, this Type 1 surge protective device delivers robust protection for low-voltage power distribution systems. Engineered for TN-S and TT networks, the 3+1 configuration combines three phase conductors and one neutral, ensuring comprehensive defense against direct lightning strikes and switching transients.

Overview

The Weidmüller VPU ZPA S I 3+1 300/7.5 is a high-performance surge arrester designed for installation at the service entrance or main distribution board. It employs advanced spark gap technology to safely divert high-energy surges to ground, protecting downstream equipment from damage. The device is rated for a maximum continuous operating voltage of 300 V AC, making it suitable for a wide range of industrial and commercial applications.

What stands out

• High discharge capacity: 7.5 kA per pole (10/350 µs) and 30 kA total impulse current
• Low voltage protection level ≤ 1.5 kV for effective equipment safeguarding
• Fast response time of less than 25 ns
• Visual status indication (green/red) for quick health checks
• Wide operating temperature range from -40 °C to +80 °C
• Compact DIN rail mounting on TS 35
• Robust thermoplastic housing with UL 94 V-0 flammability rating

Technical details

• SPD type: Type 1 (Class I) per IEC/EN 61643-11
• Number of poles: 3+1 (for TN-S, TT systems)
• Maximum continuous operating voltage (Uc): 300 V AC
• Impulse current (Iimp) per pole: 7.5 kA (10/350 µs)
• Total impulse current (Iimp total): 30 kA (10/350 µs)
• Voltage protection level (Up): ≤ 1.5 kV
• Response time: < 25 ns
• Protection technology: High-performance spark gap
• Mounting: DIN rail TS 35
• Connection: Screw terminals
• Conductor cross-section: 1.5 - 35 mm² (solid), 1.5 - 25 mm² (flexible)
• Maximum backup fuse: 315 A gG
• Operating temperature: -40 °C to +80 °C
• Protection degree: IP20
• Status indication: Visual (green/red)
• Housing material: Thermoplastic (UL 94 V-0)
• Standards: IEC 61643-11, EN 61643-11

Our verdict

For mission-critical installations where downtime is not an option, this Weidmüller surge protective device offers exceptional performance and reliability. Its high discharge capacity and fast response make it an ideal first line of defense against lightning-induced surges, ensuring the longevity of connected equipment.