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4P AC Surge Protector 385V 40kA - Full Mode Three-Phase+N SPD for Factory, Data Center & Large Buildings
The SPD-AC-4P-Grey is a 4-pole AC surge protection device providing complete full-mode protection across all four conductors – L1-PE, L2-PE, L3-PE and N-PE – in three-phase 4-wire TT and TN-S low-voltage systems. By covering all three phases and the neutral line simultaneously, it shields three-phase electrical devices, precision instruments, and the neutral conductor from surge transients caused by lightning or switching events. The maximum discharge current is 40kA with a nominal of 20kA, and the voltage protection level is – .5kV per mode. A metal oxide varistor (MOV) core responds in under 25 nanoseconds for instantaneous clamping of transient overvoltages. The grey flame-retardant PC housing (UL94 V-0) mounts on a standard 35mm DIN rail and features a modular, hot-swappable design for easy on-site maintenance. Designed for the highest level of entry-point protection in factory main distribution cabinets, data centers, and large commercial building entry panels.
Key Features
- 4-pole full-mode protection: L1-PE, L2-PE, L3-PE and N-PE in one unit
- 40kA max discharge current (Imax), 20kA nominal discharge current (In)
- Voltage protection level – .5kV – covers all phases and neutral
- <25ns ultra-fast response time – instantaneous transient suppression
- Metal oxide varistor (MOV) core – excellent conductivity and corrosion resistance
- Compatible with TT and TN-S three-phase 4-wire low-voltage systems
- Modular hot-swappable design – individual module replacement without rewiring
- Flame-retardant PC housing (UL94 V-0), grey, 35mm DIN rail mounting
Samples available · OEM pricing on request · Ships worldwide
Technical Specifications
| Poles | 4P |
| Max. Continuous Operating Voltage (Uc) | 385V AC |
| Nominal Discharge Current (In) | 20kA |
| Max. Discharge Current (Imax) | 40kA |
| Voltage Protection Level (Up) | – .5kV |
| System Type | Three-phase 4-wire Low-voltage System (TT / TN-S) |
| Protection Mode | L1-PE, L2-PE, L3-PE, N-PE (Full Mode) |
| Wiring | 3 Phase Lines (L1, L2, L3) + Neutral (N) |
| Core Component | Metal Oxide Varistor (MOV) |
| Response Time | <25ns |
| Housing Material | Flame-retardant PC (UL94 V-0), Grey |
| Mounting | 35mm DIN Rail |
| Design | Modular, Hot-swappable |
| Applications | Factory Main Cabinet, Data Center, Large Building Entry Panel |
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