Mersen K1-4PG275 Type 1+2 surge protection device with 275 V AC operating voltage, 3+1 protection configuration, 12.5 kA lightning impulse current and pluggable DIN rail construction for TT and TNS three-phase systems.
£348.24
The Mersen 44120400 K1-4PG275 is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect three-phase low-voltage electrical installations against lightning strikes and transient overvoltages. Part of the trusted Mersen Surge-Trap® K - K1 Series, this pluggable SPD provides reliable protection for commercial, industrial and infrastructure applications where electrical system continuity is essential.
Designed for installation at the main distribution board, the K1-4PG275 combines high surge current capability with a compact DIN rail mounted design. Its modular pluggable construction enables fast cartridge replacement, reducing maintenance time while ensuring continuous protection of valuable electrical equipment.
With a 275 V AC maximum continuous operating voltage (Uc), a 3+1 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-4PG275 is ideally suited for TT and TNS 230/400 V AC three-phase electrical systems, providing dependable protection against direct lightning currents and switching transients.
The Mersen K1-4PG275 safely diverts high-energy surge currents away from connected equipment before they can damage motors, switchgear, PLCs, automation systems and other sensitive electrical devices. This helps minimise downtime, reduce maintenance costs and improve the long-term reliability of electrical installations.
Its high surge capacity, compact footprint and replaceable cartridges make it an excellent solution for industrial facilities, commercial buildings, renewable energy installations and critical infrastructure where dependable surge protection is required.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-4PG275 |
| Part Number | 44120400 |
| EAN | 8435297888208 |
| 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) | 275 V AC (L-N), 255 V AC (N-PE) |
| Nominal operating voltage (Un) | 230/400 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 |
| Dimensions (H × W × D) | Approx. 90 × 72 × 98 mm |
| Weight | Approx. 0.61 kg |
It provides Type 1+2 surge protection for three-phase low-voltage electrical installations against lightning strikes and transient overvoltages.
The K1-4PG275 is designed for TT and TNS 230/400 V AC three-phase electrical distribution systems.
The device uses a 3+1 internal protection configuration, making it suitable for installations with a dedicated neutral conductor.
The SPD provides a 12.5 kA lightning impulse current per phase, a 20 kA nominal discharge current and a 50 kA maximum discharge current for the line modules.
The K1-4PG275 mounts onto a standard DIN rail inside the main electrical distribution board and features replaceable pluggable protection cartridges.
Mersen Surge-Trap® K Series surge protection devices are trusted worldwide by electrical engineers and panel builders for delivering dependable protection against lightning strikes and transient overvoltages in critical electrical installations.
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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...