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Mersen Surge Protector Type 2 SPD 4 Pole 120/208 Volt 20KA TT

Mersen Surge Protector Type 2 SPD 4 Pole 120/208 Volt 20KA TT

Mersen STPT2-40K150V-4PG Type 2 surge protection device with 40 kA Imax, 120 / 208 V AC nominal operating voltage, 150 V AC maximum continuous operating voltage, 3+1 TT configuration and pluggable DIN rail design.

SKU: 83020144Alt SKU: STPT2-40K150V-4PGMPN: 83020144
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List Price £150.52 ex VAT
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Why Choose the Mersen STPT2-40K150V-4PG Surge Protection Device?

The Mersen STPT2-40K150V-4PG (Part Number 83020144) is a high-performance Type 2 surge protection device (SPD) designed to protect three-phase plus neutral low-voltage electrical installations against transient overvoltages caused by lightning activity and electrical switching events. As part of the Mersen Surge-Trap® Pluggable STPT2 Series, it provides dependable protection for industrial, commercial and infrastructure electrical systems.

Featuring a 40 kA maximum discharge current (Imax), 150 V AC maximum continuous operating voltage (Uc) and pluggable modular construction, this SPD supports straightforward installation, rapid cartridge replacement and reliable long-term protection in electrical distribution panels.

Designed for 120 / 208 V AC three-phase plus neutral systems with a 3+1 TT configuration, the STPT2-40K150V-4PG is well suited to protecting automation equipment, machine control panels, commercial switchboards, building services and critical low-voltage electrical installations.

Key Advantages

  • Reliable Type 2 surge protection device for three-phase plus neutral low-voltage systems.
  • 40 kA maximum discharge current for effective transient overvoltage protection.
  • 150 V AC maximum continuous operating voltage for 120 / 208 V AC installations.
  • 3+1 TT configuration for applications requiring N-PE protection.
  • Pluggable cartridge design simplifies replacement and maintenance.
  • Compact 4-pole DIN rail mounting format for distribution boards and control panels.

Key Features

  • Mersen Surge-Trap® Pluggable STPT2 Series.
  • Type 2 / Class II surge protection device.
  • 40 kA Imax maximum discharge current using 8/20 μs waveform.
  • 20 kA nominal discharge current (In).
  • 120 / 208 V AC nominal operating voltage.
  • 150 V AC maximum continuous operating voltage (Uc).
  • Three-phase plus neutral, 3+1 TT configuration.
  • 4-pole, 4-module pluggable construction.
  • Visual indication system for local device status checks.
  • DIN rail mounting for electrical panels.

Reliable Surge Protection for Three-Phase Plus Neutral Installations

Type 2 surge protection devices are installed within electrical distribution systems to help limit transient overvoltages before they reach sensitive connected equipment. This helps reduce equipment damage, minimise downtime and improve the reliability of critical electrical systems.

The Mersen STPT2 pluggable range combines high discharge capability with replaceable cartridges and clear device status indication, making it suitable for preventative maintenance in control panels, low-voltage switchgear and commercial distribution boards.

Typical Applications

  • Three-phase plus neutral electrical distribution boards.
  • Industrial automation systems.
  • Machine control panels.
  • Commercial switchboards.
  • Building management systems.
  • Telecommunications and data infrastructure.
  • Water treatment facilities.
  • Low-voltage installations requiring 120 / 208 V AC surge protection.

Technical Specifications

Voltage 208 V
Phase Three Phase
Manufacturer Mersen
Series Surge-Trap® Pluggable STPT2 Series - 40kA
Model STPT2-40K150V-4PG
Item number 83020144
Product type Surge protection device
SPD Type Type 2 / Class II
UL SPD type Type 2 Component Assembly
Maximum discharge current 40 kA Imax (8/20 μs)
Nominal discharge current 20 kA In (8/20 μs)
Nominal operating voltage 120 / 208 V AC
Maximum continuous operating voltage 150 V AC
System configuration TN-S, TT
Number of poles 4 poles
Module width 4 modules
Format Pluggable
Mounting type DIN rail
Protection rating IP20
RoHS compliant Yes
EAN / UPC 8435297850809
HS Code 85363090
Country of Manufacture Spain
Poles 4-pole
Device Type Surge protection device
SPD Type Type 2
Earthing System TN-S, TT
Nominal Discharge Current (In) 20 kA
Remote Signal No

Frequently Asked Questions

What is the Mersen STPT2-40K150V-4PG used for?

It is used to protect three-phase plus neutral low-voltage electrical installations and connected equipment against transient overvoltages caused by lightning activity and switching events.

What type of surge protection device is this?

The STPT2-40K150V-4PG is a Type 2 / Class II surge protection device for electrical distribution and control systems.

What is the maximum discharge current rating?

This SPD has a 40 kA Imax maximum discharge current rating using an 8/20 μs waveform.

What voltage is this model designed for?

It is designed for 120 / 208 V AC three-phase plus neutral systems with a 150 V AC maximum continuous operating voltage.

How is this surge protection device installed?

The device is designed for DIN rail mounting and uses a pluggable modular format for straightforward installation and maintenance.

Trusted by Electrical Engineers Worldwide

Mersen Surge-Trap® surge protection devices are trusted by panel builders, electrical contractors and maintenance engineers to protect critical low-voltage installations from damaging transient overvoltages.

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