Mersen 44020111 K2-1P440-M Type 2 surge protection device with 440 V AC maximum continuous operating voltage, integrated remote signalling microswitch, 20 kA nominal discharge current and 50 kA maximum discharge current.
£45.49
The Mersen 44020111, also identified as the K2-1P440-M, is a high-performance Type 2 surge protection device (SPD) engineered to protect low-voltage electrical installations from transient overvoltages. As part of the trusted Mersen Surge-Trap K2 series, it delivers dependable protection for commercial, industrial and infrastructure applications where electrical reliability is essential.
Designed with a pluggable protection module, the K2-1P440-M allows quick servicing and cartridge replacement without removing the complete base from the DIN rail. An integrated visual status indicator and built-in remote signalling microswitch enable both local inspection and remote monitoring, helping maintenance personnel quickly identify the operational status of the surge protector.
With a 440 V AC maximum continuous operating voltage, 20 kA nominal discharge current and 50 kA maximum discharge current, the Mersen 44020111 provides effective protection against switching transients and lightning-induced surges. Its compact single-module DIN-rail design makes it ideal for electrical panels, switchboards and industrial control cabinets.
Transient overvoltages generated by switching operations and indirect lightning strikes can damage drives, PLCs, power supplies, communication equipment and other sensitive electronics. Effective surge protection helps minimise downtime, extend equipment life and improve overall system reliability.
The Mersen Surge-Trap K2 range combines high discharge capability with rapid response and advanced thermal disconnection technology. Its pluggable construction and remote indication make routine maintenance straightforward while helping ensure continuous protection of valuable electrical assets.
| Voltage | 400 V |
|---|---|
| Phase | Single Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap K2 |
| Model | K2-1P440-M |
| SKU / Part number | 44020111 |
| Product type | Surge protection device |
| SPD classification | Type 2 / Class II |
| Internal configuration | 1+0 |
| Number of poles | 1 |
| Nominal voltage | 400 V AC |
| Maximum continuous operating voltage | 440 V AC |
| Nominal discharge current | 20 kA |
| Maximum discharge current | 50 kA |
| Voltage protection level | ≤2 kV |
| Response time | ≤25 ns |
| Maximum back-up fuse | 315 A gG |
| Short-circuit withstand | 25 kA |
| Network compatibility | TN-S, TN-C and TT systems (L-N) |
| Remote signalling | Integrated microswitch |
| Status indication | Green visual indicator |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| DIN modules | 1 |
| Operating temperature | -40 to +85 °C |
| Weight | approx. 0.129 kg |
| EAN | 8435297889755 |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
The Mersen 44020111 protects low-voltage electrical installations against transient overvoltages caused by lightning activity and electrical switching events.
It is a Type 2 / Class II surge protection device designed for secondary surge protection within low-voltage electrical systems.
Yes. The K2-1P440-M includes an integrated remote signalling microswitch that allows the operating status to be monitored remotely.
The device is rated for a 20 kA nominal discharge current and a 50 kA maximum discharge current using the standard 8/20 µs waveform.
Yes. The pluggable cartridge design allows the protection module to be replaced without removing the base from the DIN rail.
Mersen Surge-Trap K2 surge protection devices are trusted by electrical engineers, panel builders and industrial maintenance teams to safeguard critical electrical systems 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...
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...