Hager SPA811Z Combined Type 1+2+3 Surge Arrester 4P 12.5kA TT/TN-S 315A

With a total impulse current of 50 kA (10/350 µs) and a voltage protection level below 1.5 kV, the Hager SPA811Z delivers industrial-grade surge protection for low-voltage power distribution systems. This combined Type 1+2+3 arrester handles direct lightning currents, induced surges, and terminal equipment transients in one compact 4-module DIN-rail unit.

Overview

Engineered for TT and TN-S earthing systems, the SPA811Z protects 230/400 V AC installations from the destructive energy of lightning strikes and switching overvoltages. Its 4-pole configuration ensures all live conductors and neutral are safeguarded, while the integrated thermal disconnector and visual status indicator provide reliable operation and easy maintenance.

What stands out

• Combined Type 1+2+3 protection per EN/IEC 61643-11
• High impulse current: 12.5 kA per pole, 50 kA total (10/350 µs)
• Low voltage protection level < 1.5 kV for sensitive equipment
• Compatible with TT and TN-S earthing systems
• Compact 4-module (72 mm) DIN-rail housing
• Integrated visual status indicator (green/red) and remote signaling contact
• Wide operating temperature range: -40 °C to +80 °C

Technical details

• Nominal voltage (Un): 230/400 V AC
• Max. continuous operating voltage (Uc): 275 V AC (L-N/L-PE)
• Impulse current (Iimp) per pole: 12.5 kA (10/350 µs)
• Total impulse current (Iimp total): 50 kA (10/350 µs)
• Nominal discharge current (In): 20 kA (8/20 µs)
• Max. discharge current (Imax): 50 kA (8/20 µs)
• Voltage protection level (Up): < 1.5 kV
• Response time: < 25 ns
• Earthing system compatibility: TT, TN-S
• Mounting type: DIN rail (EN 60715)
• Module width: 4 TE (72 mm)
• Recommended upstream fuse: 315 A gG
• Remote signaling contact: Yes
• Visual status indicator: Yes (green/red)
• Protection degree: IP20
• Operating temperature range: -40 °C to +80 °C
• Standards: EN 61643-11, IEC 61643-11
• Disconnector type: Integrated thermal disconnector

Our verdict

The Hager SPA811Z is a robust, all-in-one surge protection solution for demanding electrical installations, combining high surge capacity with reliable performance and easy monitoring.