Mersen STPT12-25K275V-4PG Type 1+2 surge protection device with 25 kA lightning impulse current rating and 275 V UC for 230/400 V AC three-phase plus neutral 3+1 TT electrical systems.
£555.97
The Mersen 83120150 STPT12-25K275V-4PG 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-4PG provides a powerful 25 kA Iimp (10/350 μs) lightning impulse current rating. With a 275 V UC maximum continuous operating voltage and an 8-module pluggable construction, it is ideal for incoming distribution boards requiring dependable 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 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-4PG |
| Part number | 83120150 |
| EAN/UPC | 8435297857365 |
| 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, 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) |
| Number of poles | 4 |
| Number of modules | 8 |
| Mounting type | DIN rail |
| Format | Pluggable |
| 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 83120150 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.
The device provides a 25 kA Iimp (10/350 μs) lightning impulse current rating.
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.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
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...
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...