Mersen 83120105 STPT12-12K320V-1PM Type 1+2 surge protection device with 12.5 kA lightning impulse current, 277 V nominal operating voltage, 320 V maximum continuous operating voltage and remote indication.
Original price was: £96.01.£76.81Current price is: £76.81.
The Mersen 83120105 STPT12-12K320V-1PM is a robust Type 1+2 surge protection device (SPD) engineered to protect low-voltage electrical installations against lightning currents and transient overvoltages. As part of the proven Mersen Surge-Trap® Pluggable STPT12 Series, it is designed for installation at the main distribution board where dependable surge protection is essential.
Combining lightning current protection and transient voltage suppression within a compact pluggable module, the STPT12-12K320V-1PM provides excellent protection for industrial, commercial and infrastructure electrical systems. The pluggable cartridge allows rapid replacement, while integrated visual and remote status indication simplifies maintenance and monitoring.
With a 12.5 kA lightning impulse current (10/350 μs), 320 V maximum continuous operating voltage (Uc) and 277 V nominal operating voltage (Un), this single-pole SPD is ideal for protecting equipment connected to 277 V AC systems.
Surge protection devices help prevent damage caused by lightning strikes, switching operations and electrical transients. Installing a Type 1+2 SPD at the incoming supply provides an effective first stage of protection for downstream equipment, helping minimise downtime and reduce maintenance costs.
The Mersen STPT12 Series is designed for demanding electrical installations requiring high surge current capability, dependable long-term performance and rapid replacement of protection modules when necessary.
| Voltage | 277 V |
|---|---|
| Phase | Single Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT12 |
| Model | STPT12-12K320V-1PM |
| Part number | 83120105 |
| Product type | Type 1+2 Surge Protection Device |
| IEC classification | Class I+II |
| Lightning impulse current (Iimp 10/350 μs) | 12.5 kA |
| Maximum discharge current (Imax 8/20 μs) | 50 kA |
| Nominal discharge current (In 8/20 μs) | 20 kA |
| Nominal operating voltage (Un) | 277 V AC |
| Maximum continuous operating voltage (Uc) | 320 V AC |
| Protection mode | L-N |
| Number of poles | 1 |
| Mounting type | 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 currents and transient overvoltages.
The 83120105 is a Type 1+2 (Class I+II) surge protection device designed for combined lightning current and surge protection.
Yes. The STPT12-12K320V-1PM includes both visual and remote indication for convenient monitoring of the protection module.
It is designed for 277 V AC nominal systems with a maximum continuous operating voltage of 320 V AC.
It is typically installed on a DIN rail within the main distribution board to provide the first level of protection against lightning and transient surges.
Mersen Surge-Trap® surge protection devices are trusted worldwide to provide reliable protection against lightning currents and transient overvoltages in industrial, commercial and critical infrastructure applications.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
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...