Mersen 44020107 K2-1P320-M Surge-Trap K2 Type 2 single-pole surge protection device with 320 V AC maximum continuous operating voltage, 20 kA nominal discharge current and 50 kA maximum discharge current.
£45.49
The Mersen 44020107, also identified as the K2-1P320-M, is a compact and dependable Type 2 surge protection device (SPD) designed to protect low-voltage electrical installations against transient overvoltages. As part of the advanced Mersen Surge-Trap K2 series, it provides reliable secondary surge protection for commercial, industrial and infrastructure electrical systems.
This single-pole surge arrester uses a pluggable protection cartridge, helping simplify inspection, servicing and replacement. A built-in visual status indicator provides clear confirmation of operating condition, while the integrated microswitch enables remote monitoring through control panels, building-management systems or industrial automation equipment.
With a maximum continuous operating voltage of 320 V AC, a nominal discharge current of 20 kA and a maximum discharge current of 50 kA, the Mersen 44020107 provides robust protection against induced voltage surges. Its one-module DIN-rail format makes it suitable for installation in compact distribution boards and electrical control enclosures.
Transient overvoltages can be caused by lightning activity, utility switching operations and the operation of inductive electrical equipment. These short-duration voltage spikes can damage control systems, machinery, power supplies and sensitive electronic components.
The Mersen Surge-Trap K2 series is designed to divert damaging surge currents safely away from connected equipment. Its high discharge capacity, rapid response time and thermal disconnection system help maintain dependable protection while reducing the risk of equipment failure and costly operational downtime.
| Voltage | 277 V |
|---|---|
| Phase | Single Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap K2 |
| Model | K2-1P320-M |
| SKU / part number | 44020107 |
| Product type | Surge protection device |
| SPD classification | Type 2 / Class II |
| Number of poles | 1 |
| Internal configuration | 1+0 |
| Maximum continuous operating voltage | 320 V AC |
| Nominal voltage | 277 V AC, 50 / 60 Hz |
| Nominal discharge current | 20 kA |
| Maximum discharge current | 50 kA |
| Voltage protection level | ≤1.5 kV |
| Response time | ≤25 ns |
| Maximum back-up fuse | 315 A gG |
| IEC short-circuit withstand | 25 kA |
| Network compatibility | TN-S, TN-C and TT systems for L-N protection |
| Status indication | Visual indicator and microswitch |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| DIN rail modules | 1 |
| Operating temperature | -40 to +85 °C |
| Dimensions (H × W × D) | approx. 104.6 × 18 × 68.2 mm |
| Net weight | approx. 0.125 kg |
| EAN | 8435297889731 |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
The Mersen 44020107 is used to protect low-voltage electrical installations and connected equipment against transient overvoltages caused by lightning activity and electrical switching events.
It is a Type 2 / Class II surge protection device intended primarily as a secondary level of protection within electrical distribution systems.
The Mersen 44020107 has a maximum discharge current of 50 kA using an 8/20 microsecond surge waveform.
Yes. The K2-1P320-M includes an integrated microswitch that can provide remote status indication to a control panel or monitoring system.
Yes. The device has a pluggable design, allowing the surge protection cartridge to be replaced without removing the complete base assembly from the DIN rail.
Mersen Surge-Trap protection devices are widely used by electrical engineers, panel builders and industrial operators to protect critical equipment 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...