Mersen K1-3P320 Type 1+2 surge protection device with 320 V AC operating voltage, 12.5 kA lightning impulse current and pluggable DIN rail design for TNC 277/480 V three-phase electrical systems.
£267.62
The Mersen 44120304 K1-3P320 is a premium Type 1+2 Surge Protection Device (SPD) engineered to protect three-phase low-voltage electrical installations against lightning strikes and transient overvoltages. As part of the trusted Mersen Surge-Trap® K - K1 Series, this pluggable surge protector delivers dependable first-line protection for industrial, commercial and infrastructure applications requiring continuous electrical system reliability.
Designed for installation within the main distribution board, the K1-3P320 combines a compact DIN rail mounted design with high surge handling capability. Its pluggable construction enables quick replacement during maintenance, helping minimise downtime whilst ensuring valuable equipment remains protected from damaging surge events.
With a 320 V AC maximum continuous operating voltage (Uc), 3+0 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-3P320 is specifically designed for TNC 277/480 V AC three-phase electrical systems, providing reliable protection against both direct lightning strikes and switching transients.
The Mersen K1-3P320 safely diverts high-energy surge currents away from connected electrical equipment before they can damage motors, drives, switchgear and sensitive electronic control systems. This helps minimise downtime, reduce maintenance costs and improve the long-term reliability of electrical installations.
Its high surge current capacity, compact footprint and pluggable construction make it an excellent choice for industrial automation, manufacturing facilities, commercial buildings and critical infrastructure where dependable surge protection is essential.
| Voltage | 480 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-3P320 |
| Part Number | 44120304 |
| 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 |
| Configuration | 3+0 |
| Number of poles | 3 |
| System compatibility | TNC |
| Protection level (Up) | ≤1.5 kV |
| Mounting type | DIN rail |
| Format | Pluggable |
| Protection rating | IP20 |
| Dimensions (H × W × D) | Approx. 90 × 54 × 90 mm |
| Weight | Approx. 0.48 kg |
It provides Type 1+2 surge protection for three-phase low-voltage electrical installations against lightning strikes and transient overvoltages.
The K1-3P320 is designed for TNC 277/480 V AC three-phase electrical distribution systems.
The device has a maximum continuous operating voltage (Uc) of 320 V AC.
The SPD features a 12.5 kA lightning impulse current, 20 kA nominal discharge current and 50 kA maximum discharge current.
The K1-3P320 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 by electrical engineers worldwide for protecting three-phase 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...
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...