Mersen K1-3P275 Type 1+2 surge protection device with 275 V AC operating voltage, 12.5 kA lightning impulse current and pluggable DIN rail design for TNC three-phase electrical systems.
£247.80
The Mersen 44120300 K1-3P275 is a robust Type 1+2 Surge Protection Device (SPD) engineered to protect three-phase low-voltage electrical installations from lightning strikes and transient overvoltages. Part of the trusted Mersen Surge-Trap® K - K1 Series, this pluggable surge protector provides dependable first-level protection for industrial, commercial and infrastructure applications.
Designed for installation within the main distribution board, the K1-3P275 combines high surge current capability with a compact DIN rail mounted design. Its pluggable construction enables quick replacement during servicing, helping minimise maintenance time while ensuring continuous protection of critical electrical equipment.
With a 275 V AC maximum continuous operating voltage (Uc), 3+0 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-3P275 is ideally suited to TNC three-phase 400 V electrical systems requiring reliable surge protection.
The Mersen K1-3P275 safely diverts high-energy surge currents away from connected equipment before they can damage switchgear, drives, motors and sensitive electronic systems. This helps improve installation reliability, reduce maintenance costs and minimise operational downtime.
Its high surge capacity and compact pluggable design make it an excellent choice for industrial control panels, commercial buildings, manufacturing facilities and critical infrastructure where dependable surge protection is essential.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-3P275 |
| Part Number | 44120300 |
| 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 | 3+0 |
| Number of poles | 3 |
| System compatibility | TNC |
| Protection level (Up) | ≤1.5 kV |
| Mounting type | DIN rail |
| Format | Pluggable |
| Protection rating | IP20 |
| Dimensions (H × W × D) | Approx. 90 × 54 × 90 mm |
| Weight | Approx. 0.49 kg |
It provides Type 1+2 surge protection for three-phase low-voltage electrical installations against lightning strikes and transient overvoltages.
The K1-3P275 is designed for TNC three-phase 230/400 V AC electrical distribution systems.
The device has a maximum continuous operating voltage (Uc) of 275 V AC.
The SPD features a 12.5 kA lightning impulse current, 20 kA nominal discharge current and 50 kA maximum discharge current.
The K1-3P275 is supplied in a pluggable housing for installation onto a standard DIN rail inside a main electrical distribution board.
Mersen Surge-Trap® K Series surge protection devices are trusted worldwide by electrical engineers and contractors for protecting three-phase electrical systems against lightning strikes and transient overvoltages.
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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...