Mersen STPT12-25K275V-4PGM Type 1+2 surge protection device with 25 kA lightning impulse current rating, 275 V UC and remote indication for 230/400 V AC three-phase plus neutral 3+1 TT electrical systems.
Original price was: £606.01.£447.85Current price is: £447.85.
The Mersen 83120151 STPT12-25K275V-4PGM is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect low-voltage electrical installations from lightning currents and transient overvoltages. Built for industrial, commercial and infrastructure applications, it provides dependable protection for electrical distribution systems, switchboards and sensitive connected equipment.
Part of the trusted Mersen Surge-Trap® Pluggable STPT12 Series - 25kA, this DIN rail mounted surge protection device provides robust first-stage protection in a compact pluggable format. Its 3+1 TT configuration makes it suitable for three-phase plus neutral installations where both phase-to-neutral and neutral-to-earth surge protection are required.
Designed for 230/400 V AC three-phase plus neutral (3Ph+N) TT electrical systems, the STPT12-25K275V-4PGM provides a powerful 25 kA Iimp (10/350 μs) lightning impulse current rating. With a 275 V UC line-neutral maximum continuous operating voltage and remote indication, it is ideal for incoming distribution boards requiring dependable surge protection with external monitoring.
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 incoming distribution board provides a robust first line of defence for downstream electrical equipment and control systems.
The Mersen STPT12 Series - 25kA range 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 | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT12 Series - 25kA |
| Model | STPT12-25K275V-4PGM |
| Part number | 83120151 |
| EAN/UPC | 8435297857891 |
| 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 L-N) | 275 V AC |
| Maximum continuous operating voltage (Uc N-PE) | 255 V AC |
| System configuration | 3Ph+N, 3+1 TT |
| Protection modes | L-N / 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 |
| Remote indication | Yes |
| Protection rating | IP20 |
| Standards | EN 61643-11 / IEC 61643-11 |
| RoHS compliant | Yes |
It is used to protect low-voltage electrical installations against lightning currents and transient overvoltages.
The 83120151 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 three-phase plus neutral electrical systems using a 3+1 TT configuration.
Yes. The STPT12-25K275V-4PGM 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...