Mersen K1-4P275-M Type 1+2 surge protection device with integrated remote signalling, 275 V AC operating voltage, 4+0 configuration and pluggable DIN rail mounting for TNS 230/400 V AC electrical systems.
£366.24
The Mersen 44120405 K1-4P275-M is a premium Type 1+2 Surge Protection Device (SPD) designed to protect three-phase low-voltage electrical installations against lightning currents and transient overvoltages. Part of the trusted Mersen Surge-Trap® K - K1 Series, this pluggable SPD combines high surge protection performance with integrated remote signalling, making it an ideal solution for industrial, commercial and critical infrastructure applications.
Designed for installation within the main distribution board, the K1-4P275-M features replaceable pluggable protection modules that simplify maintenance and minimise downtime. The integrated microswitch provides remote status monitoring, allowing maintenance teams to receive indication when the SPD requires replacement without opening the enclosure.
Featuring 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-M is specifically designed for TNS 230/400 V AC three-phase electrical systems, providing dependable protection against direct lightning strikes and switching surges.
The Mersen K1-4P275-M safely diverts damaging lightning currents and transient overvoltages away from connected equipment before they can affect switchgear, PLCs, motor drives, automation systems and other sensitive electrical devices. This helps minimise downtime, reduce maintenance costs and improve the reliability of electrical installations.
Its combination of high surge current capability, integrated remote monitoring and replaceable pluggable cartridges makes it particularly suitable for industrial facilities, commercial buildings, utilities and other critical power distribution systems where continuous protection is essential.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-4P275-M |
| Part Number | 44120405 |
| EAN | 8435297888215 |
| 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 modes | L-PE / N-PE |
| Protection level (Up) | ≤1.5 kV |
| Rated short-circuit withstand (ISCCR) | 25 kA |
| Maximum back-up fuse | 315 A gG |
| Remote indication | Integrated microswitch |
| Mounting type | DIN rail |
| Format | Pluggable |
| Protection rating | IP20 |
| Operating temperature | -40°C to +85°C |
| Housing material | PA6 CT1 & PA66 CT1 |
| Tightening torque | 3 Nm |
| Dimensions (H × W × D) | Approx. 90 × 72 × 90 mm |
| Weight | Approx. 0.65 kg |
| RoHS compliant | Yes |
It provides Type 1+2 surge protection for three-phase electrical installations against lightning currents, switching surges and transient overvoltages.
Yes. The K1-4P275-M features an integrated microswitch that allows the status of the surge protection device to be monitored remotely.
The device is designed for TNS 230/400 V AC three-phase electrical distribution systems.
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 replaceable pluggable cartridges for fast servicing.
Mersen Surge-Trap® K Series surge protection devices are trusted by electrical engineers and panel builders worldwide to deliver 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...