Mersen STPT12-12K275V-4PM Type 1+2 surge protection device with 12.5 kA lightning impulse current rating, 275 V UC and remote indication for 230/400 V AC three-phase plus neutral TNS systems.
£366.24
The Mersen 83120145 STPT12-12K275V-4PM is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect low-voltage electrical installations against lightning currents and transient overvoltages. Built for industrial, commercial and infrastructure applications, it helps safeguard sensitive electrical equipment, distribution systems and control panels from damaging surge events.
Part of the trusted Mersen Surge-Trap® STPT12 Series, this pluggable DIN rail mounted surge protection device combines lightning current discharge capability with Type 2 surge protection performance in a compact modular format. Its remote indication contact allows easy monitoring of device status, making it suitable for critical electrical systems where uptime and maintenance visibility are important.
Designed for 230/400 V AC three-phase plus neutral (3Ph+N) electrical systems in a 4+0 TNS configuration, the STPT12-12K275V-4PM provides a 12.5 kA Iimp (10/350 μs) lightning impulse current rating per pole and is suitable as the first stage of surge protection in main distribution boards.
Surge protection devices are essential for reducing the risk of damage caused by lightning strikes, utility switching and transient overvoltage events. Installing a Type 1+2 SPD at the main distribution board helps protect downstream equipment and improves the resilience of the wider electrical installation.
The Mersen STPT12 series is engineered for demanding electrical environments, offering dependable protection for switchboards, automation systems, industrial machinery and commercial building services where electrical continuity is important.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® STPT12 |
| Model | STPT12-12K275V-4PM |
| Part number | 83120145 |
| Product type | Type 1+2 Surge Protection Device |
| IEC classification | Class I+II |
| Nominal operating voltage (Un) | 230/400 V AC |
| Maximum continuous operating voltage (Uc) | 275 V AC |
| System configuration | 3Ph+N, 4+0 TNS |
| 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) |
| Number of poles | 4 |
| Number of modules | 4 |
| Mounting type | DIN rail |
| Format | Pluggable |
| Remote indication | Yes |
| Protection rating | IP20 |
| Standards | EN 61643-11 / IEC 61643-11 |
| RoHS compliant | Yes |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It is used to protect low-voltage electrical installations against lightning currents and transient overvoltages.
The 83120145 is a Type 1+2 / Class I+II surge protection device designed for both lightning current discharge and transient overvoltage protection.
It is designed for 230/400 V AC three-phase plus neutral (3Ph+N) systems using a 4+0 TNS configuration.
Yes. The STPT12-12K275V-4PM includes remote indication for monitoring the status of the surge protection device.
It is typically installed in the main incoming distribution board as the first stage of surge protection for the electrical installation.
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and industrial facilities worldwide to provide dependable protection against lightning currents, switching surges and 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...