Mersen 44020218 K2-2P440 Type 2 two-pole surge protection device for 400 V AC TN-S systems, featuring a 440 V AC maximum continuous operating voltage, 20 kA nominal discharge current and 50 kA maximum discharge current.
£74.78
The Mersen 44020218, also identified as the K2-2P440, is a robust Type 2 surge protection device (SPD) designed to protect low-voltage electrical installations against transient overvoltages. Part of the proven Mersen Surge-Trap K2 series, it is suitable as a second level of protection in distribution boards and other installations where damaging surges may be generated by lightning activity, utility switching or inductive electrical loads.
The K2-2P440 features a compact, pluggable two-pole construction that enables the protection cartridges to be inspected and replaced without removing the complete DIN-rail base. Its visual status indication displays green when the protection modules are operational and changes when replacement is required, helping maintenance teams identify the device condition quickly.
With a 400 V AC nominal operating voltage, a 440 V AC maximum continuous operating voltage to earth, a 20 kA nominal discharge current and a 50 kA maximum discharge current, the Mersen 44020218 delivers dependable surge protection for commercial and industrial TN-S electrical systems. Its compact two-module format makes it suitable for installation in distribution boards, switchgear assemblies and automation panels.
Transient overvoltages can enter an electrical installation through the power supply network or be generated internally when motors, contactors, transformers and other inductive loads are switched. These short-duration voltage spikes can damage PLCs, drives, power supplies, communication equipment and other sensitive electronic devices.
The Mersen K2-2P440 diverts excessive surge energy towards earth before it reaches connected equipment. Its high discharge capacity, replaceable protection cartridges and clear visual indication help improve system reliability while simplifying routine maintenance in commercial and industrial installations.
| Voltage | 400 V |
|---|---|
| Phase | Single Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap K2 |
| Model | K2-2P440 |
| SKU / Part number | 44020218 |
| Product type | Surge protection device |
| IEC SPD classification | Type 2 / Class II |
| UL SPD classification | Type 1 Component Assembly |
| Format | Pluggable |
| Number of poles | 2 |
| System configuration | TN-S |
| Protection modes | L-PE / N-PE |
| Nominal operating voltage | 400 V AC |
| Maximum continuous operating voltage (L-G) | 440 V AC |
| Maximum continuous operating voltage (N-G) | 440 V AC |
| Maximum continuous operating voltage (L-N) | 880 V AC |
| Nominal discharge current | 20 kA |
| Maximum discharge current | 50 kA |
| Surge current waveform | 8/20 µs |
| Voltage protection rating (L-G) | 1,500 V |
| Voltage protection rating (N-G) | 1,500 V |
| Voltage protection rating (L-N) | 2,500 V |
| MOV response time | ≤25 ns |
| Short-circuit withstand rating | 25 kA |
| Maximum back-up fuse | 315 A gG |
| Status indication | Green (OK) / Not green (replace) |
| Terminal tightening torque | 3 Nm |
| Housing material | PA6 CT1 and PA66 CT1 |
| Mounting type | DIN rail |
| Replacement plug | Mersen 44020005 |
| Dimensions (H × W × D) | 90 × 36 × 74.4 mm |
| Product weight | approx. 0.223 kg |
| RoHS compliant | Yes |
| EAN / UPC | 8435297889847 |
The Mersen 44020218 protects 400 V AC low-voltage electrical installations and connected equipment against transient overvoltages caused by lightning activity, utility switching and inductive loads.
It is a Type 2 / Class II surge protection device intended primarily as a second level of surge protection in commercial and industrial electrical installations.
The K2-2P440 has a 20 kA nominal discharge current and a 50 kA maximum discharge current based on the standard 8/20 µs surge waveform.
No. This version provides local visual status indication. Applications requiring an integrated remote signalling contact should use the corresponding monitored K2 model where specified.
Yes. The pluggable design allows the protection cartridges to be replaced without removing the complete DIN-rail base. The specified replacement plug is Mersen part number 44020005.
Mersen Surge-Trap K2 surge protection devices are trusted by electrical engineers, panel builders and maintenance professionals to protect critical low-voltage electrical installations against 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...