Mersen K1-4P320-M Type 1+2 surge protection device with integrated remote signalling, 320 V AC operating voltage, 4+0 configuration and pluggable DIN rail mounting for TNS 277/480 V AC electrical systems.
£395.53
The Mersen 44120413 K1-4P320-M is a premium Type 1+2 Surge Protection Device (SPD) engineered 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 current capability with integrated remote signalling, making it an excellent choice for industrial, commercial and critical infrastructure installations.
Designed for installation within the main distribution board, the K1-4P320-M features replaceable pluggable protection modules that simplify maintenance and minimise downtime. The integrated microswitch provides remote status monitoring, enabling maintenance personnel to receive immediate notification when replacement cartridges are required without opening the electrical enclosure.
Featuring a 320 V AC maximum continuous operating voltage (Uc), a 4+0 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-4P320-M is specifically designed for TNS 277/480 V AC three-phase electrical systems, delivering dependable protection against direct lightning strikes and switching surges.
The Mersen K1-4P320-M safely diverts lightning currents and transient overvoltages away from connected electrical equipment before they can damage switchgear, PLCs, motor drives, building management systems and other sensitive electronic devices. This helps minimise costly downtime, reduce maintenance requirements and improve the long-term reliability of power distribution systems.
Its combination of high surge current capability, integrated remote monitoring and pluggable cartridge design makes it an ideal solution for manufacturing facilities, commercial buildings, utilities, renewable energy installations and other mission-critical electrical infrastructure.
| Voltage | 480 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-4P320-M |
| Part Number | 44120413 |
| EAN | 8435297888246 |
| 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 |
| Nominal operating voltage (Un) | 277/480 V AC |
| Lightning impulse current (Iimp) | 12.5 kA |
| Nominal discharge current (In) | 20 kA |
| Maximum discharge current (Imax) | 50 kA |
| Protection modes | L-PE / N-PE |
| Configuration | 4+0 |
| Number of poles | 4 |
| System compatibility | TNS |
| Protection level (Up) | ≤1.5 kV |
| Following current (Ifi) | 100 A |
| 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 +80°C |
| Housing material | PA6 CT1 & PA66 CT1 |
| Tightening torque | 3 Nm |
| Dimensions (H × W × D) | Approx. 90 × 72 × 90 mm |
| Weight | Approx. 0.66 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 K1-4P320-M includes an integrated microswitch that allows the operating status of the surge protection device to be monitored remotely.
The device is designed for TNS 277/480 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.
The device mounts onto a standard DIN rail and features pluggable replacement cartridges for fast servicing and reduced maintenance downtime.
Mersen Surge-Trap® K Series surge protection devices are trusted by electrical engineers, panel builders and contractors worldwide to protect critical power distribution systems from lightning strikes and damaging 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...