Mersen K1-4P275 Type 1+2 surge protection device with 275 V AC operating voltage, 4+0 configuration and pluggable DIN rail mounting for TNS 230/400 V AC electrical systems.
£326.99
The Mersen 44120404 K1-4P275 is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect three-phase low-voltage electrical installations against lightning currents and transient overvoltages. As part of the trusted Mersen Surge-Trap® K - K1 Series, this pluggable surge protector delivers reliable first-level protection for industrial, commercial and infrastructure applications requiring dependable power quality and system availability.
Designed for installation within the main distribution board, the K1-4P275 combines a compact DIN rail mounted design with a high surge current capacity. Its pluggable construction enables rapid replacement of protection modules during maintenance, reducing downtime whilst maintaining continuous protection of valuable electrical equipment.
With a 275 V AC maximum continuous operating voltage (Uc), a 4+0 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-4P275 is specifically designed for TNS 230/400 V AC three-phase electrical systems, providing dependable protection against lightning strikes and switching transients.
The Mersen K1-4P275 safely diverts damaging lightning currents and transient overvoltages away from connected electrical equipment before they can affect switchgear, automation systems, motor drives, PLCs and other sensitive electronics. This helps minimise downtime, reduce maintenance costs and improve installation reliability.
Its high surge current capability, compact footprint and pluggable modular design make it an excellent choice for industrial facilities, commercial buildings, manufacturing plants and critical infrastructure where dependable surge protection is essential.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-4P275 |
| Part Number | 44120404 |
| EAN | 8435297888000 |
| 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 |
| Nominal operating voltage (Un) | 230/400 V AC |
| Lightning impulse current (Iimp) | 12.5 kA |
| Nominal discharge current (In) | 20 kA |
| Maximum discharge current (Imax) | 50 kA |
| Configuration | 4+0 |
| Number of poles | 4 |
| System compatibility | TNS |
| Protection level (Up) | ≤1.5 kV |
| Following current (Ifi) | 100 A |
| Rated short-circuit withstand (ISCCR) | 25 kA |
| Maximum back-up fuse | 315 A gG |
| Mounting type | DIN rail |
| Format | Pluggable |
| Protection rating | IP20 |
| Operating temperature | -40°C to +80°C |
| Dimensions (H × W × D) | Approx. 90 × 72 × 90 mm |
| Weight | Approx. 0.641 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 K1-4P275 is designed for TNS 230/400 V AC three-phase electrical distribution systems.
The device features a 4+0 internal protection configuration, making it suitable for TNS electrical installations.
The SPD provides a 12.5 kA lightning impulse current, a 20 kA nominal discharge current and a 50 kA maximum discharge current.
The surge protection device mounts onto a standard DIN rail inside the main electrical distribution board and features pluggable cartridges for quick servicing and replacement.
Mersen Surge-Trap® K Series surge protection devices are trusted by electrical engineers and panel builders worldwide 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...
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...