Mersen K1-4PG320 Type 1+2 surge protection device with 320 V AC operating voltage, 3+1 configuration and pluggable DIN rail mounting for TT and TNS 277/480 V AC electrical systems.
£367.05
The Mersen 44120408 K1-4PG320 is a premium Type 1+2 Surge Protection Device (SPD) developed to safeguard three-phase low-voltage electrical installations from lightning currents and transient overvoltages. As part of the proven Mersen Surge-Trap® K - K1 Series, this pluggable SPD provides reliable first-stage protection for commercial, industrial and infrastructure applications requiring dependable power system protection.
Designed for installation within the main distribution board, the K1-4PG320 combines high surge current capability with a compact DIN rail mounted design. Its modular pluggable construction enables rapid replacement of protection cartridges during maintenance, helping minimise downtime whilst maintaining continuous protection of valuable electrical equipment.
Featuring a 320 V AC maximum continuous operating voltage (Uc), a 3+1 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-4PG320 is specifically designed for TT and TNS 277/480 V AC three-phase electrical systems, providing effective protection against direct lightning currents and switching surges.
The Mersen K1-4PG320 safely diverts damaging surge currents away from connected electrical equipment before they can reach motors, switchgear, PLCs, drives and sensitive control electronics. This helps reduce equipment failures, minimise downtime and improve the long-term reliability of electrical installations.
Its high lightning current capability, pluggable modular construction and compact footprint make it an ideal solution for industrial facilities, commercial buildings, renewable energy installations and critical infrastructure where dependable surge protection is essential.
| Voltage | 480 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-4PG320 |
| Part Number | 44120408 |
| EAN | 8435297888222 |
| Product type | Type 1+2 Surge Protection Device (SPD) |
| IEC SPD Type | Class I+II |
| UL SPD Type | Type 1 Component Assembly |
| Maximum continuous operating voltage (Uc) | 320 V AC (L-N) |
| Nominal operating voltage (Un) | 277/480 V AC |
| Lightning impulse current (Iimp) | 12.5 kA (L-N), 50 kA (N-PE) |
| Nominal discharge current (In) | 20 kA (L-N), 50 kA (N-PE) |
| Maximum discharge current (Imax) | 50 kA (L-N), 100 kA (N-PE) |
| Configuration | 3+1 |
| Number of poles | 4 |
| System compatibility | TT, TNS |
| Protection level (Up) | ≤1.5 kV |
| Mounting type | DIN rail |
| Format | Pluggable |
| Protection rating | IP20 |
| Operating temperature | -40°C to +80°C |
| Maximum back-up fuse | 315 A gG |
| Dimensions (H × W × D) | Approx. 90 × 72 × 90 mm |
| Weight | Approx. 0.61 kg |
| RoHS compliant | Yes |
It provides Type 1+2 surge protection for three-phase electrical installations against lightning currents, switching surges and transient overvoltages.
The K1-4PG320 is designed for TT and TNS 277/480 V AC three-phase electrical distribution systems.
The device features a 3+1 internal protection configuration, providing enhanced protection for systems with a dedicated neutral conductor.
The SPD delivers a 12.5 kA lightning impulse current, 20 kA nominal discharge current and 50 kA maximum discharge current on the line modules.
The device mounts onto a standard DIN rail inside the main electrical distribution board and uses replaceable pluggable cartridges for straightforward maintenance.
Mersen Surge-Trap® K Series surge protection devices are trusted worldwide by electrical engineers and panel builders to provide dependable protection against lightning strikes and transient overvoltages in critical power distribution systems.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...