Mersen K1-3P275-M Type 1+2 surge protection device with 275 V AC operating voltage, integrated remote signalling, 12.5 kA lightning impulse current and pluggable DIN rail design for TNC three-phase electrical systems.
£277.53
The Mersen 44120301 K1-3P275-M is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect three-phase low-voltage electrical installations from lightning strikes and transient overvoltages. As part of the proven Mersen Surge-Trap® K - K1 Series, this pluggable SPD combines excellent surge protection with integrated remote signalling, making it ideal for industrial, commercial and critical infrastructure applications.
Designed for installation within the main distribution board, the K1-3P275-M provides reliable first-stage protection against high-energy surge events while helping minimise downtime and equipment damage. Its compact DIN rail mounted design and pluggable construction simplify installation and maintenance, whilst the integrated microswitch enables convenient remote monitoring of device status.
With a 275 V AC maximum continuous operating voltage (Uc), 3+0 protection configuration, 12.5 kA lightning impulse current (Iimp) and an integrated remote indication contact, the K1-3P275-M is ideally suited for TNC 230/400 V AC electrical systems requiring dependable surge protection.
The Mersen K1-3P275-M safely diverts high-energy surge currents away from connected equipment before they can damage drives, switchgear, motors and sensitive electronic systems. This helps reduce maintenance costs, minimise downtime and improve the reliability of electrical installations.
Its high surge handling capability, integrated remote monitoring and compact pluggable construction make it an excellent solution for industrial control panels, manufacturing plants, commercial buildings and infrastructure projects where continuous protection is essential.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-3P275-M |
| Part Number | 44120301 |
| 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 |
| Indication | Green (OK) / Not Green (Replace) with microswitch |
| Protection rating | IP20 |
| Dimensions (H × W × D) | Approx. 90 × 54 × 90 mm |
| Weight | Approx. 0.50 kg |
It provides Type 1+2 surge protection for three-phase low-voltage electrical installations against lightning strikes and transient overvoltages.
Yes. The K1-3P275-M includes an integrated microswitch that provides remote signalling of the surge protection device status.
The device is designed for TNC 230/400 V AC three-phase electrical distribution systems.
The SPD features a 12.5 kA lightning impulse current, 20 kA nominal discharge current and 50 kA maximum discharge current.
The K1-3P275-M 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...