Mersen K1-4PG275-M Type 1+2 surge protection device with integrated remote signalling, 275 V AC operating voltage, 3+1 configuration and pluggable DIN rail mounting for TT and TNS three-phase systems.
£383.07
The Mersen 44120401 K1-4PG275-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. As part of the trusted Mersen Surge-Trap® K - K1 Series, this pluggable SPD combines high surge protection performance with an integrated remote signalling contact, making it ideal for industrial, commercial and critical infrastructure applications.
Designed for installation within the main distribution board, the K1-4PG275-M features a modular pluggable design that allows rapid cartridge replacement during maintenance, helping to minimise downtime. The integrated microswitch provides remote status monitoring, enabling maintenance teams to receive fault notifications without opening the enclosure.
With a 275 V AC maximum continuous operating voltage (Uc), a 3+1 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-4PG275-M is designed for TT and TNS 230/400 V AC three-phase electrical systems, providing dependable protection against direct lightning strikes and switching surges.
The Mersen K1-4PG275-M safely diverts damaging surge currents away from connected equipment before they can affect switchgear, PLCs, variable speed drives, building management systems and other sensitive electrical devices. This helps reduce downtime, minimise maintenance costs and improve installation reliability.
Its combination of high lightning current capability, remote monitoring functionality and pluggable construction makes it an excellent choice for industrial plants, commercial buildings, utilities and other critical power distribution installations.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-4PG275-M |
| Part Number | 44120401 |
| EAN | 8435297884064 |
| 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 (L-N), 255 V AC (N-PE) |
| Nominal operating voltage (Un) | 230/400 V AC |
| Lightning impulse current (Iimp) | 12.5 kA (L-N), 50 kA (N-PE) |
| Nominal discharge current (In) | 20 kA (L-N), 50 kA (N-PE) |
| Maximum discharge current (Imax) | 50 kA (L-N), 100 kA (N-PE) |
| Configuration | 3+1 |
| Number of poles | 4 |
| System compatibility | TT, TNS |
| Protection level (Up) | ≤1.5 kV |
| Remote indication | Integrated microswitch |
| Mounting type | DIN rail |
| Format | Pluggable |
| Protection rating | IP20 |
| Operating temperature | -40°C to +80°C |
| Maximum back-up fuse | 315 A gG |
| Dimensions (H × W × D) | Approx. 90 × 72 × 90 mm |
| Weight | Approx. 0.614 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 K1-4PG275-M features an integrated microswitch that allows the surge protection device status to be monitored remotely.
The device is designed for TT and TNS 230/400 V AC three-phase electrical distribution systems.
It provides a 12.5 kA lightning impulse current, 20 kA nominal discharge current and 50 kA maximum discharge current on the line modules.
The surge protection device installs onto a standard DIN rail and features pluggable protection cartridges for quick replacement during servicing.
Mersen Surge-Trap® K Series surge protection devices are trusted by electrical engineers and panel builders worldwide to protect critical power distribution 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...