Mersen STPT12-25K275V-4PM Type 1+2 surge protection device with 25 kA lightning impulse current, remote indication and pluggable modules for 230/400 V AC three-phase plus neutral 4+0 TNS electrical systems.
£597.87
The Mersen 83120161 STPT12-25K275V-4PM is a premium Type 1+2 Surge Protection Device (SPD) designed to safeguard low-voltage electrical installations against lightning currents and transient overvoltages. Developed for demanding industrial, commercial and infrastructure applications, it provides dependable protection for switchboards, electrical distribution systems and sensitive electronic equipment.
As part of the trusted Mersen Surge-Trap® Pluggable STPT12 Series - 25kA, this DIN rail mounted SPD offers robust first-stage surge protection in a compact pluggable format. The integrated remote indication allows continuous monitoring of device status, while the pluggable cartridges simplify maintenance and minimise downtime.
Designed for 230/400 V AC three-phase plus neutral (3Ph+N) electrical systems using a 4+0 TNS configuration, the STPT12-25K275V-4PM delivers a 25 kA Iimp (10/350 μs) lightning impulse current rating and a 100 kA Imax (8/20 μs) discharge capability, making it ideal for protecting incoming power distribution boards in critical installations.
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 downtime and improve installation reliability.
The Mersen STPT12 Series has been developed for demanding industrial and commercial environments where dependable surge protection is essential for maintaining operational continuity and protecting valuable electrical assets.
| Voltage | 400 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT12 Series - 25kA |
| Model | STPT12-25K275V-4PM |
| Part number | 83120161 |
| EAN | 8435297859147 |
| 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 |
| Remote indication | Yes |
| Protection rating | IP20 |
| Operating temperature | -40°C to +85°C |
| Standards | EN IEC 61643-11 |
| RoHS compliant | Yes |
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.
Yes. The STPT12-25K275V-4PM includes remote indication for external monitoring of the device status.
Yes. The pluggable cartridge design enables quick replacement while leaving the base installed.
It is intended for installation in the main incoming distribution board as the first stage of surge protection.
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and industrial facilities worldwide to provide dependable protection against lightning currents 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...