Mersen STPT12-12K440V-4PM Type 1+2 surge protection device with 12.5 kA lightning impulse current rating, 440 V UC and remote indication for 230/400 V AC and 400/690 V AC three-phase plus neutral systems.
£373.55
The Mersen 83120149 STPT12-12K440V-4PM is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect low-voltage electrical installations from lightning currents and transient overvoltages. Developed for industrial, commercial and infrastructure environments, it helps protect distribution systems, control panels and sensitive electrical equipment 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 transient overvoltage protection in a compact modular format. The remote indication feature enables device status to be monitored externally, supporting easier maintenance and faster fault identification.
Designed for 230/400 V AC and 400/690 V AC three-phase plus neutral (3Ph+N) systems, the STPT12-12K440V-4PM provides a 12.5 kA Iimp (10/350 μs) lightning impulse current rating. Its 440 V UC maximum continuous operating voltage makes it suitable for higher voltage installations requiring dependable first-stage surge protection.
Surge protection devices help reduce the risk of equipment damage caused by lightning strikes, switching operations and transient overvoltage events. Installing a Type 1+2 SPD at the main distribution board provides a robust first line of defence for downstream electrical equipment and control systems.
The Mersen STPT12 series is engineered for demanding electrical environments, offering dependable surge protection for switchboards, automation systems, industrial machinery, commercial facilities and infrastructure installations where operational continuity is essential.
| Voltage | 690 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® STPT12 |
| Model | STPT12-12K440V-4PM |
| Part number | 83120149 |
| Product type | Type 1+2 Surge Protection Device |
| IEC classification | Class I+II |
| Nominal operating voltage (Un) | 400/690 V AC |
| Maximum continuous operating voltage (Uc) | 440 V AC |
| System configuration | 3Ph+N, 4+0 IT / TNS |
| Protection modes | L-PE / N-PE |
| 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 |
| 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 83120149 is a Type 1+2 / Class I+II surge protection device designed for lightning current discharge and transient overvoltage protection.
It is designed for 230/400 V AC and 400/690 V AC three-phase plus neutral installations using 4+0 IT or TNS configurations.
Yes. The STPT12-12K440V-4PM includes remote indication for external monitoring of the surge protection device status.
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...