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Mersen Surge Protector Type 1+2 SPD 4 Pole 230/400 Volt 20KA TNS Remote Indication

Mersen Surge Protector Type 1+2 SPD 4 Pole 230/400 Volt 20KA TNS Remote Indication

Mersen STPT12-12K275V-4PM Type 1+2 surge protection device with 12.5 kA lightning impulse current rating, 275 V UC and remote indication for 230/400 V AC three-phase plus neutral TNS systems.

SKU: 83120145Alt SKU: STPT12-12K275V-4PMMPN: 83120145
This product has been discontinued A direct replacement is available below.
K1-4P275-M Mersen Surge Protector Type 1+2 SPD 4 Pole 230/400 Volt 20KA TNS Remote Indication Replacement product K1-4P275-M Mersen Surge Protector Type 1+2 SPD 4 Pole 230/400 Volt 20KA TNS Remote Indication SKU: 44120405 £274.68 ex VAT View

Manufacturer Lead Time

£274.68

Why Choose the Mersen 83120145 STPT12-12K275V-4PM Surge Protection Device?

The Mersen 83120145 STPT12-12K275V-4PM is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect low-voltage electrical installations against lightning currents and transient overvoltages. Built for industrial, commercial and infrastructure applications, it helps safeguard sensitive electrical equipment, distribution systems and control panels from damaging surge events.

Part of the trusted Mersen Surge-Trap® STPT12 Series, this pluggable DIN rail mounted surge protection device combines lightning current discharge capability with Type 2 surge protection performance in a compact modular format. Its remote indication contact allows easy monitoring of device status, making it suitable for critical electrical systems where uptime and maintenance visibility are important.

Designed for 230/400 V AC three-phase plus neutral (3Ph+N) electrical systems in a 4+0 TNS configuration, the STPT12-12K275V-4PM provides a 12.5 kA Iimp (10/350 μs) lightning impulse current rating per pole and is suitable as the first stage of surge protection in main distribution boards.

Key Advantages

  • Combined Type 1+2 surge protection for lightning currents and transient overvoltages.
  • 12.5 kA Iimp (10/350 μs) lightning impulse current capability.
  • Designed for 230/400 V AC three-phase plus neutral TNS systems.
  • 4-pole pluggable modular design for easier maintenance.
  • Remote indication contact for monitoring device status.
  • DIN rail mounting for straightforward installation in distribution panels.
  • Suitable as primary surge protection in incoming power supply panels.

Key Features

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

Reliable Protection Against Lightning and Voltage Surges

Surge protection devices are essential for reducing the risk of damage caused by lightning strikes, utility switching and transient overvoltage events. Installing a Type 1+2 SPD at the main distribution board helps protect downstream equipment and improves the resilience of the wider electrical installation.

The Mersen STPT12 series is engineered for demanding electrical environments, offering dependable protection for switchboards, automation systems, industrial machinery and commercial building services where electrical continuity is important.

Typical Applications

  • Main electrical distribution boards.
  • Industrial control panels.
  • Commercial building electrical systems.
  • Manufacturing facilities.
  • Infrastructure and utility installations.
  • Automation equipment and switchboards.

Technical Specifications

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Impulse Current Iimp (kA) 12.5 kA
Voltage 400 V
Phase Three Phase
Poles 4-pole
Device Type Surge protection device
SPD Type Type 1+2
Earthing System TN-S
Nominal Discharge Current (In) 20 kA
Remote Signal Yes
Manufacturer Mersen
Series Surge-Trap® STPT12
Model STPT12-12K275V-4PM
Part number 83120145
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-S
Lightning impulse current (Iimp) 12.5 kA (10/350 μs)
Maximum discharge current (Imax) 50 kA (8/20 μs)
Nominal Discharge Current (In) 20 kA (8/20 μs)
Number of poles 4
Number of modules 4
Mounting type DIN rail
Format Pluggable
Remote indication Yes
Protection rating IP20
Standards EN 61643-11 / IEC 61643-11
RoHS compliant Yes
HS Code 85363090
Country of Manufacture Spain

Frequently Asked Questions

What is the Mersen 83120145 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 83120145 is a Type 1+2 / Class I+II surge protection device designed for both 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 (3Ph+N) systems using a 4+0 TNS configuration.

Does this version include remote indication?

Yes. The STPT12-12K275V-4PM includes remote indication for monitoring the status of the surge protection device.

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.