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Mersen Surge Protector Type 1+2 SPD 3 Pole 400 Volt 25KA TNC Remote Indication

Mersen Surge Protector Type 1+2 SPD 3 Pole 400 Volt 25KA TNC Remote Indication

Mersen STPT12-25K275V-3PM 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 3+0 TNC electrical systems.

SKU: 83120159MPN: 83120159
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List Price £453.07 ex VAT
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Why Choose the Mersen 83120159 STPT12-25K275V-3PM Surge Protection Device?

The Mersen 83120159 STPT12-25K275V-3PM 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. The integrated remote indication feature allows device status to be monitored externally, helping improve maintenance visibility and reduce downtime in critical electrical installations.

Designed for 230/400 V AC three-phase (3Ph) TNC electrical systems, the STPT12-25K275V-3PM provides a powerful 25 kA Iimp (10/350 μs) lightning impulse current rating per phase. With a 275 V UC maximum continuous operating voltage and 3+0 TNC configuration, it is ideal for incoming distribution boards requiring dependable surge protection with remote 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 TNC systems.
  • 3+0 TNC configuration for incoming power supply protection.
  • Remote indication contact for external monitoring of device status.
  • 3-pole, 6-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 maximum continuous operating voltage.
  • 3-pole, 6-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 TNC 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-3PM
Part number 83120159
EAN/UPC 8435297859123
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 TN-C
Protection mode L-PEN
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 3
Number of modules 6
Mounting type DIN rail
Format Pluggable
Remote indication Yes
Protection rating IP20
Standards EN 61643-11 / IEC 61643-11
RoHS compliant Yes
Poles 3-pole
Device Type Surge protection device
SPD Type Type 1+2
Earthing System TN-C
Nominal Discharge Current (In) 25 kA
Remote Signal Yes

Frequently Asked Questions

What is the Mersen 83120159 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 83120159 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 electrical systems using a 3+0 TNC configuration.

Does this version include remote indication?

Yes. The STPT12-25K275V-3PM 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.

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