Mersen STPT12-12K320V-2PM Type 1+2 pluggable surge protection device with 12.5 kA lightning impulse current, 277 V AC nominal voltage, remote indication and DIN rail mounting.
£198.04
The Mersen 83120123 STPT12-12K320V-2PM is a high-performance Type 1+2 Surge Protection Device (SPD) engineered to protect low voltage electrical installations against transient overvoltages caused by lightning strikes and switching events. As part of the trusted Mersen Surge-Trap® Pluggable STPT12 Series, it provides reliable protection for industrial, commercial and critical infrastructure applications.
Designed for installation within main distribution boards, this pluggable surge protection device combines Class I and Class II protection into a compact DIN rail mounted solution. Its replaceable protection module, visual status indication and remote signalling contact simplify maintenance while helping maximise system uptime.
Supporting a 277 V AC nominal system voltage with a 12.5 kA lightning impulse current (10/350 μs), the Mersen 83120123 provides dependable protection for sensitive electrical equipment, automation systems and distribution networks exposed to atmospheric or switching surges.
Surge protection devices protect electrical systems from damaging transient overvoltages caused by lightning activity and switching operations. By limiting surge energy before it reaches connected equipment, they help reduce downtime, extend equipment life and improve overall installation reliability.
The Mersen Surge-Trap® STPT12 Series is designed for demanding industrial and commercial environments where dependable surge protection is essential for automation equipment, switchboards, power distribution systems and critical infrastructure.
| Voltage | 277 V |
|---|---|
| Phase | Single Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT12 |
| Model | STPT12-12K320V-2PM |
| SKU | 83120123 |
| Product type | Type 1+2 Surge Protection Device |
| IEC classification | Class I+II |
| Lightning impulse current (Iimp) | 12.5 kA (10/350 μs) |
| Maximum discharge current (Imax) | 50 kA (8/20 μs) |
| Nominal discharge current (In) | 20 kA (8/20 μs) |
| Nominal operating voltage (Un) | 277 V AC |
| Maximum continuous operating voltage (Uc) | 320 V |
| System configuration | 2+0 TNS |
| Number of poles | 2 |
| Mounting type | 35 mm DIN rail |
| Protection rating | IP20 |
| Remote indication | Yes |
| Format | Pluggable |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It protects low voltage electrical installations against lightning induced surges and transient overvoltages.
The device provides combined Type 1+2 (Class I+II) surge protection in accordance with IEC standards.
Yes. The pluggable cartridge design allows the protection module to be replaced quickly without removing the complete base.
Yes. It includes an integrated remote signalling contact in addition to visual status indication.
It is normally installed on a DIN rail inside the main electrical distribution board to provide primary surge protection for the installation.
Mersen Surge-Trap® surge protection devices are trusted worldwide by electrical engineers, panel builders and industrial facilities for reliable protection of power distribution systems and sensitive electrical equipment.
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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...