Call Us Today
01706 242050
Trade Portal
Mersen Surge Protector Type 1+2 SPD 4 Pole 230/400 Volt 25KA TT Remote Indication

Mersen Surge Protector Type 1+2 SPD 4 Pole 230/400 Volt 25KA TT Remote Indication

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.

SKU: 83120151MPN: 83120151
Price
List Price £606.01 ex VAT
Your Price (ex VAT) Save 26%
£447.85 26% OFF
You save £158.16 per unit
Manufacturer Lead Time Please contact us for a delivery time before you order
Get the best trade prices Trade exclusive

Create a trade account to unlock exclusive pricing, special offers and more.

Sign up for a trade account Quick & easy setup
SUBTOTAL (EX VAT) £447.85
Trade pricing is personalised to your account

Manufacturer Lead Time

£447.85

Why Choose the Mersen 83120151 STPT12-25K275V-4PGM Surge Protection Device?

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.

Key Advantages

  • Combined Type 1+2 surge protection for lightning currents and transient overvoltages.
  • 25 kA Iimp (10/350 μs) lightning impulse current capability.
  • Designed for 230/400 V AC three-phase plus neutral TT systems.
  • 3+1 TT configuration for L-N and N-PE protection.
  • Remote indication contact for external monitoring of device status.
  • 4-pole, 8-module pluggable design for straightforward maintenance.
  • DIN rail mounting for quick installation in electrical distribution panels.

Key Features

  • Mersen Surge-Trap® Pluggable STPT12 Series - 25kA.
  • Type 1+2 / Class I+II surge protection device.
  • 25 kA Iimp (10/350 μs) lightning impulse current.
  • 100 kA Imax (8/20 μs) maximum discharge current.
  • 25 kA In (8/20 μs) nominal discharge current.
  • 230/400 V AC nominal operating voltage.
  • 275 V UC L-N and 255 V UC N-PE.
  • 4-pole, 8-module pluggable format with remote indication.

Reliable Protection Against Lightning and Voltage Surges

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.

Typical Applications

  • Main electrical distribution boards.
  • Three-phase plus neutral TT electrical systems.
  • Industrial control panels.
  • Commercial building electrical installations.
  • Automation and machinery control systems.
  • Telecom, IT and data centre power systems.
  • Infrastructure and utility installations.

Technical Specifications

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 TN-S, 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
Poles 4-pole
Device Type Surge protection device
SPD Type Type 1+2
Earthing System TN-S, TT
Nominal Discharge Current (In) 25 kA
Remote Signal Yes

Frequently Asked Questions

What is the Mersen 83120151 used for?

It is used to protect low-voltage electrical installations against lightning currents and transient overvoltages.

What type of surge protection device is this?

The 83120151 is a Type 1+2 / Class I+II surge protection device designed for lightning current discharge and transient overvoltage protection.

What electrical system is this device designed for?

It is designed for 230/400 V AC three-phase plus neutral electrical systems using a 3+1 TT configuration.

Does this version include remote indication?

Yes. The STPT12-25K275V-4PGM includes remote indication for external monitoring of the surge protection device status.

Where should this SPD be installed?

It is typically installed in the main incoming distribution board as the first stage of surge protection for the electrical installation.

Trusted for Industrial Electrical 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, 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.

 Priority sourcing and supply support

 Flexible payment terms for qualifying organisations

 Support for engineering, maintenance, and operations

500 +

Stock lines ready to ship

1,000 +

Same day dispatches

3500 +

Customers supported

28 

Trusted Manfacturers

● frequently asked questions

Common questions about our products and support

 

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.

What product ranges do you supply

We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products. 

Can you help specify the correct part?

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.

Do you have stock for urgent orders?

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.

What are your delivery times and costs?

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.

What about warranties, returns and faulty items?

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

Discover  our latest insights and
expert advice

From a Simple Idea to Small Business of the Year: The LED Controls Story So Far…

From a Simple Idea to Small Business of the Year: The LED Controls Story So Far…

by | Aug 11, 2026 |

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.

LED Controls: Danfoss Drives Authorised Partner

LED Controls: Danfoss Drives Authorised Partner

by | Jan 17, 2026 |

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...

LED Controls: Your Complete Control Panel Solution

LED Controls: Your Complete Control Panel Solution

by | Jan 17, 2026 |

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...