Mersen 44020301 K2-3P275-M Type 2 three-pole surge protection device with integrated remote signalling, 275 V AC maximum continuous operating voltage, 20 kA nominal discharge current and 50 kA maximum discharge current.
£121.51
The Mersen 44020301, also known as the K2-3P275-M, is a high-performance Type 2 surge protection device (SPD) designed to protect three-phase low-voltage electrical installations from transient overvoltages. Part of the trusted Mersen Surge-Trap K2 series, it provides reliable protection for 230/400 V TN-C electrical systems while incorporating an integrated remote signalling contact for continuous monitoring of the device status.
Its pluggable design enables the protection modules to be replaced quickly without removing the complete DIN-rail base, minimising maintenance time and reducing downtime. A visual status indicator provides instant local inspection, while the integrated microswitch allows remote monitoring through PLCs, SCADA systems or building management systems.
Featuring a 275 V AC maximum continuous operating voltage, 20 kA nominal discharge current and 50 kA maximum discharge current, the Mersen 44020301 offers dependable protection against lightning-induced surges and switching transients in commercial, industrial and infrastructure applications.
Transient overvoltages caused by lightning activity, utility switching and inductive loads can damage PLCs, motor drives, switchgear, communication equipment and sensitive electronics. Installing a dedicated Type 2 SPD significantly reduces the risk of equipment failure and costly downtime.
The Mersen K2-3P275-M combines high surge current capability with integrated remote signalling, allowing maintenance personnel to monitor protection status remotely while benefiting from rapid replacement of the pluggable protection modules whenever servicing is required.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap K2 |
| Model | K2-3P275-M |
| SKU / Part number | 44020301 |
| Product type | Surge protection device |
| IEC SPD classification | Type 2 / Class II |
| UL SPD classification | Type 1 Component Assembly |
| Internal configuration | 3+0 |
| Number of poles | 3 |
| Network configuration | TN-C |
| Protection mode | L-PE(N) |
| Nominal operating voltage | 230/400 V AC |
| Maximum continuous operating voltage | 275 V AC |
| Nominal discharge current | 20 kA |
| Maximum discharge current | 50 kA |
| Voltage protection level | ≤1.5 kV |
| Response time | ≤25 ns |
| Residual current | <1 mA |
| Short-circuit withstand | 25 kA |
| Maximum back-up fuse | 315 A gG |
| Dynamic thermal disconnection | Yes |
| Status indication | Green (OK) / Not green (replace) |
| Remote signalling | Integrated microswitch |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| DIN rail modules | 3 |
| Replacement cartridge | Mersen 44020001 |
| Dimensions (H × W × D) | 90 × 54 × 74.4 mm |
| Weight | approx. 0.39 kg |
| EAN | 8435297889694 |
| RoHS compliant | Yes |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
The Mersen 44020301 protects three-phase TN-C electrical installations against transient overvoltages while providing remote monitoring of the surge protection status.
It is a Type 2 / Class II surge protection device designed for secondary surge protection in low-voltage three-phase electrical systems.
Yes. An integrated microswitch provides remote status indication to PLCs, SCADA systems and building management systems.
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 construction allows the protection cartridges to be replaced without removing the complete DIN-rail base.
Mersen Surge-Trap K2 surge protection devices are trusted by electrical engineers, panel builders and maintenance professionals to protect critical three-phase electrical systems against damaging transient overvoltages while simplifying maintenance through remote monitoring.
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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...