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Mersen Surge Protector Type 2+3 SPD 3 Pole 400 Volt 10KA TNC Remote Indication

Mersen Surge Protector Type 2+3 SPD 3 Pole 400 Volt 10KA TNC Remote Indication

Mersen 83230121 Surge-Trap STPT23-20K275V-3P-LFM Type 2+3 surge protection device with 20 kA discharge capacity for three-phase 230/400 V AC electrical installations.

SKU: 83230121Alt SKU: STPT23-20K275V-3P-LFMMPN: 83230121
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List Price £114.57 ex VAT
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Why Choose the Mersen 83230121 Surge Protection Device?

The Mersen 83230121 is a high performance Type 2+3 Surge Protection Device (SPD) designed to protect low voltage electrical installations against transient overvoltages caused by lightning strikes and switching events. Part of the trusted Mersen Surge-Trap® STPT23 LF Series, this pluggable SPD delivers dependable protection for commercial, industrial and automation applications.

Designed for three-phase electrical systems, the device combines compact construction with excellent surge handling capability. Its pluggable design simplifies maintenance, while integrated remote indication allows easy monitoring of device status within electrical distribution systems.

With a maximum discharge current of 20 kA (8/20 μs), a 275 V AC continuous operating voltage (Uc) and a 230/400 V AC nominal operating voltage, the Mersen 83230121 provides reliable protection for switchboards, control panels and industrial installations where equipment availability is critical.

Key Advantages

  • High performance Type 2+3 surge protection device.
  • 20 kA maximum discharge current (Imax) for effective transient protection.
  • Pluggable module for rapid replacement and simplified maintenance.
  • Suitable for 230/400 V AC three-phase systems.
  • Remote indication contact for system monitoring.
  • Protects sensitive electrical and automation equipment against surge damage.

Key Features

  • Mersen Surge-Trap® STPT23 LF Series.
  • Catalogue number: STPT23-20K275V-3P-LFM.
  • IEC Type 2+3 / Class II+III surge protection.
  • 20 kA Imax (8/20 μs).
  • 10 kA nominal discharge current (In).
  • 275 V AC continuous operating voltage (Uc).
  • Three-pole, 3+0 TNC configuration.
  • Remote indication and pluggable module design.

Reliable Protection Against Electrical Surges

Surge protection devices divert damaging transient voltages away from sensitive electrical equipment before they can cause failures or reduce equipment lifespan. Installing a quality SPD helps minimise downtime, improve system reliability and protect valuable industrial assets.

The Mersen Surge-Trap® STPT23 range is engineered for modern electrical installations requiring dependable protection of automation equipment, switchboards, PLCs, control panels and industrial machinery operating on three-phase power systems.

Typical Applications

  • Industrial control panels.
  • Electrical distribution boards.
  • Manufacturing and automation systems.
  • Commercial buildings.
  • Motor control centres.
  • PLC and control equipment protection.

Technical Specifications

Voltage 400 V
Phase Three Phase
Manufacturer Mersen
Series Surge-Trap® STPT23 LF Series
Model STPT23-20K275V-3P-LFM
SKU 83230121
Product type Surge Protection Device (SPD)
SPD classification Type 2+3 / Class II+III
Maximum discharge current (Imax) 20 kA (8/20 μs)
Nominal Discharge Current (In) 10 kA
Continuous operating voltage (Uc) 275 V AC
Nominal operating voltage (Un) 230/400 V AC
System configuration TN-C
Number of poles 3
Mounting format Pluggable modular device
Protection mode L-PE(N)
Response time 25 ns
Maximum back-up fuse 63 A gG
RoHS compliant Yes
HS Code 85363090
Country of Manufacture Spain
Poles 3-pole
Device Type Surge protection device
SPD Type Type 2+3
Earthing System TN-C
Nominal Discharge Current (In) 10 kA
Remote Signal Yes

Frequently Asked Questions

What is the Mersen 83230121 used for?

It protects low voltage electrical installations and connected equipment from transient overvoltages caused by lightning and switching events.

What type of surge protection device is it?

The unit is an IEC Type 2+3 (Class II+III) surge protection device designed for low voltage installations.

What electrical system is this SPD designed for?

It is designed for 230/400 V AC three-phase 3+0 TNC systems with a continuous operating voltage of 275 V AC.

Is the module replaceable?

Yes. The device features a pluggable design that allows rapid replacement during maintenance.

Does the device provide remote monitoring?

Yes. The Mersen 83230121 includes a remote indication contact for integration with monitoring and building management systems.

Trusted by Electrical Professionals Worldwide

Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and industrial maintenance professionals to protect valuable electrical infrastructure from damaging transient overvoltages.

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