Mersen K1-2PG275 Type 1+2 surge protection device for TT single-phase electrical systems with coordinated L-N and N-PE protection.
£158.22
The Mersen K1-2PG275, product code 44120200, is a premium Type 1+2 Surge Protection Device (SPD) designed to protect single-phase TT electrical systems (1Ph+N) against lightning-induced surges and transient overvoltages. As part of the Mersen Surge-Trap® K1 Series, it combines line-to-neutral and neutral-to-earth protection within a compact two-pole, pluggable assembly, making it ideal for installation at the main distribution board.
The K1-2PG275 features a 1+1 protection configuration, a maximum continuous operating voltage (Uc) of 275 V AC, and replaceable protection cartridges for simplified servicing. Engineered for TT earthing systems, it provides dependable protection for sensitive electrical equipment in commercial, industrial and residential installations.
Each protection path offers a 12.5 kA lightning impulse current (Iimp), 50 kA maximum discharge current (Imax), 20 kA nominal discharge current (In), and a voltage protection level (Up ≤1.5 kV), ensuring compliance with IEC 61643-11 and reliable protection against both lightning and switching surges.
The Mersen K1-2PG275 combines both line-to-neutral and neutral-to-earth protection into a coordinated Type 1+2 SPD specifically designed for TT earthing systems. This arrangement safely diverts lightning currents and switching surges before they can damage sensitive electrical equipment or interrupt critical operations.
Its pluggable cartridges enable quick replacement following end-of-life indication, reducing maintenance time while maintaining continuous protection for commercial, industrial and infrastructure electrical installations.
| Voltage | 230 V |
|---|---|
| Manufacturer | Mersen |
| Series | Surge-Trap® K1 |
| Model | K1-2PG275 |
| Product code | 44120200 |
| Product type | Type 1+2 Surge Protection Device |
| IEC classification | Class I + II |
| Configuration | 1+1 |
| System type | TT (1Ph+N) |
| Nominal voltage (Un) | 230 V AC |
| Maximum continuous operating voltage (Uc) | 275 V AC |
| Lightning impulse current (Iimp 10/350 μs) | 12.5 kA per pole |
| Nominal discharge current (In 8/20 μs) | 20 kA |
| Maximum discharge current (Imax 8/20 μs) | 50 kA |
| Voltage protection level (Up) | ≤1.5 kV |
| Protection modes | L-N and N-PE |
| Mounting | 35 mm DIN rail |
| Module type | Pluggable |
| Status indication | Visual indicator |
| Flammability rating | UL94 V-0 |
| Width | 36 mm (2 modules) |
| Height | 90 mm |
| Depth | 90.4 mm |
| Applicable standard | IEC 61643-11 |
| RoHS compliant | Yes |
It protects single-phase TT electrical installations against lightning currents and transient overvoltages using coordinated Type 1+2 surge protection.
The K1-2PG275 is specifically designed for TT (1Ph+N) electrical systems.
It provides coordinated protection across both the line-to-neutral (L-N) and neutral-to-earth (N-PE) circuits.
Yes. Both protection cartridges are pluggable and can be replaced quickly without removing the DIN rail base.
It is installed within the main electrical distribution board to provide primary surge protection for the entire installation.
Mersen Surge-Trap® K1 Series surge protection devices are trusted worldwide by electrical engineers, contractors and panel builders for dependable protection against lightning and transient overvoltages in commercial, industrial and critical infrastructure 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...