Mersen STPT12-25K275V-4P Type 1+2 surge protection device with 25 kA lightning impulse current rating for 230/400 V AC three-phase plus neutral 4+0 TNS electrical systems.
£548.50
The Mersen 83120160 STPT12-25K275V-4P is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect low-voltage electrical installations against lightning currents and transient overvoltages. Developed for industrial, commercial and infrastructure applications, it provides reliable protection for electrical distribution systems, switchboards and critical equipment exposed to surge events.
Part of the proven Mersen Surge-Trap® Pluggable STPT12 Series - 25kA, this DIN rail mounted SPD is engineered as the first level of protection within main distribution boards. Its pluggable design allows rapid module replacement while maintaining high system availability and simplified maintenance.
Designed for 230/400 V AC three-phase plus neutral (3Ph+N) electrical systems using a 4+0 TNS configuration, the STPT12-25K275V-4P delivers a powerful 25 kA Iimp (10/350 μs) lightning impulse current rating per pole together with a 100 kA maximum discharge current, making it ideal for installations requiring robust primary surge protection.
Type 1+2 surge protection devices provide the primary defence against direct lightning currents and switching overvoltages entering an electrical installation. Installing an SPD at the incoming distribution board helps protect downstream electrical equipment, reduce costly downtime and improve installation reliability.
The Mersen STPT12 Series is designed for demanding industrial and commercial environments where dependable surge protection is essential for maintaining business continuity and protecting valuable assets.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT12 Series - 25kA |
| Model | STPT12-25K275V-4P |
| Part number | 83120160 |
| EAN | 8435297859130 |
| 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 |
| Protection modes | L-PE / N-PE |
| Lightning impulse current (Iimp) | 25 kA (10/350 μs) |
| Maximum discharge current (Imax) | 100 kA (8/20 μs) |
| Nominal discharge current (In) | 25 kA (8/20 μs) |
| Short circuit withstand (ISCCR) | 25 kA |
| Number of poles | 4 |
| Number of modules | 8 |
| Mounting type | DIN rail |
| Format | Pluggable |
| Indication | Visual status indicator |
| Protection rating | IP20 |
| Standards | EN IEC 61643-11 |
| RoHS compliant | Yes |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It protects low-voltage electrical installations from lightning currents and transient overvoltages.
It is designed for 230/400 V AC three-phase plus neutral electrical systems using a 4+0 TNS configuration.
The device provides a 25 kA Iimp (10/350 μs) lightning impulse current rating per pole.
Yes. The pluggable cartridge design allows quick replacement of protection modules while leaving the base installed.
It is intended for installation in the main incoming distribution board as the first level of surge protection.
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers and panel builders worldwide to provide dependable protection against lightning currents and transient overvoltages in critical electrical installations.
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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...