Mersen K1-4PG320-M Type 1+2 surge protection device with integrated remote signalling, 320 V AC operating voltage, 3+1 configuration and pluggable DIN rail mounting for TT and TNS 277/480 V AC electrical systems.
£403.75
The Mersen 44120409 K1-4PG320-M is a premium Type 1+2 Surge Protection Device (SPD) engineered to protect three-phase low-voltage electrical installations from lightning currents and transient overvoltages. Part of the trusted Mersen Surge-Trap® K - K1 Series, this pluggable surge protector combines exceptional 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 K1-4PG320-M features a modular pluggable construction that enables rapid replacement of protection cartridges during servicing. Its integrated microswitch allows remote monitoring of the device status, enabling maintenance personnel to receive fault notifications without opening the enclosure, reducing downtime and simplifying preventative maintenance.
With a 320 V AC maximum continuous operating voltage (Uc), a 3+1 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-4PG320-M is designed for TT and TNS 277/480 V AC three-phase electrical systems, providing dependable protection against direct lightning currents and switching surges.
The Mersen K1-4PG320-M safely diverts damaging lightning currents and transient overvoltages away from connected electrical equipment before they can affect switchgear, PLCs, variable speed drives, automation systems and other sensitive electronics. This helps reduce maintenance costs, minimise downtime and improve overall installation reliability.
Its combination of high surge capacity, integrated remote monitoring and pluggable cartridge design makes it an ideal solution for industrial facilities, commercial buildings, utilities, renewable energy installations and other critical power distribution systems.
| Voltage | 480 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-4PG320-M |
| Part Number | 44120409 |
| EAN | 8435297887690 |
| 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) | 320 V AC (L-N), 255 V AC (N-PE) |
| Nominal operating voltage (Un) | 277/480 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) |
| Protection modes | L-N / N-PE |
| Configuration | 3+1 |
| Number of poles | 4 |
| System compatibility | TT, TNS |
| Protection level (Up) | ≤1.5 kV |
| Following current (Ifi) | 100 A |
| Rated short-circuit withstand (ISCCR) | 25 kA |
| Remote indication | Integrated microswitch |
| Maximum back-up fuse | 315 A gG |
| Mounting type | DIN rail |
| Format | Pluggable |
| Housing material | PA6 CT1 & PA66 CT1 |
| Protection rating | IP20 |
| Operating temperature | -40°C to +80°C |
| Tightening torque | 3 Nm |
| Dimensions (H × W × D) | Approx. 90 × 72 × 90 mm |
| Weight | Approx. 0.616 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 K1-4PG320-M includes an integrated microswitch that enables remote indication of the surge protection device status for easier maintenance planning.
The device is designed for TT and TNS 277/480 V AC three-phase electrical distribution systems.
The SPD 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 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 installations.
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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...