4P 40KA AC Surge Protector | Three Phase Class II SPD

Our AC Surge Protective Device (SPD) is engineered to safeguard critical power systems from transient overvoltages caused by lightning strikes and grid switching operations. Built with advanced chip manufacturing technology, it delivers reliable surge current discharge and precise voltage clamping, effectively limiting residual voltage to a safe level for downstream equipment.

Available in 2P (single-phase) and 4P (three-phase) configurations, with nominal discharge currents (In) ranging from 20kA to 40kA and maximum surge currents (Imax) up to 100kA, this SPD is compatible with 385V AC systems. Its DIN-rail mounting design allows for easy installation in distribution cabinets, while the fire-retardant shell ensures enhanced safety under extreme conditions. The built-in status indicator provides real-time monitoring of the SPD’s operational status, enabling quick maintenance and replacement.

As a core component of a multi-level lightning protection system, this Class II SPD acts as the secondary defense layer, efficiently mitigating residual surge energy after primary protection and protecting sensitive electrical equipment from damage.

Key Features

· Multi-specification Compatibility: Available in 2P/4P pole configurations, with surge current ratings from 20KA to 100KA, suitable for single-phase and three-phase AC systems.

· High Surge Bearing Capacity: Adopts advanced chip manufacturing technology, capable of discharging large instantaneous surge currents and withstanding repeated lightning impacts.

· Precise Voltage Clamping: Limits residual voltage (Up) to ≤1.8kV, effectively protecting downstream electrical and electronic equipment from overvoltage damage.

· Fire-retardant Housing: Made of high-strength flame-retardant material, meeting safety standards and preventing fire spread in case of component failure.

· Easy Installation & Monitoring: DIN-rail mount design for quick installation in distribution cabinets; built-in visual status indicator for real-time operational monitoring.

· Wide Application Range: Suitable for industrial power distribution, commercial buildings, residential incoming lines, and other AC power scenarios requiring reliable surge protection.

· Power Distribution Systems: Installed in main distribution cabinets, floor distribution boxes, and workshop power cabinets as secondary surge protection.

· Industrial Facilities: Protects industrial machinery, control systems, and power supply equipment from lightning and switching overvoltages.

· Commercial & Residential Buildings: Safeguards building incoming power lines, lighting systems, and household appliances from surge damage.

· Data Centers & Server Rooms: Complements higher-level SPDs to protect critical IT equipment and power distribution units (PDUs).

· Infrastructure Projects: Applied in substations, transformer stations, and outdoor power supply facilities to ensure stable operation of power grids.