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Mersen Surge Protector Type 2 SPD 3 Pole 208 Volt 20KA TNC

Mersen Surge Protector Type 2 SPD 3 Pole 208 Volt 20KA TNC

Mersen STPT2-40K150V-3P Type 2 surge protection device with 40 kA Imax, 120/208 V AC nominal operating voltage, 150 V AC maximum continuous operating voltage, 3+0 TNC configuration and pluggable DIN rail design.

SKU: 83020132Alt SKU: STPT2-40K150V-3PMPN: 83020132
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List Price £112.16 ex VAT
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Why Choose the Mersen STPT2-40K150V-3P Surge Protection Device?

The Mersen STPT2-40K150V-3P (Part Number 83020132) is a high-performance Type 2 surge protection device (SPD) designed to protect 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 maximum continuous operating voltage (Uc) and pluggable modular construction, this SPD supports fast installation, simple replacement and reliable long-term protection in electrical distribution panels.

Designed for 120/208 V AC three-phase systems with a 3+0 TNC configuration, the STPT2-40K150V-3P is ideal for protecting automation equipment, machine control panels, commercial switchboards, telecommunications equipment and critical low-voltage electrical installations.

Key Advantages

  • Reliable Type 2 surge protection device for three-phase low-voltage installations.
  • 40 kA maximum discharge current for effective transient overvoltage protection.
  • 150 V maximum continuous operating voltage for 120/208 V AC systems.
  • Pluggable cartridge design simplifies replacement and maintenance.
  • Compact 3-pole DIN rail mounting format for distribution boards and control panels.
  • Suitable for industrial, commercial and infrastructure applications.

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).
  • 3-phase, 3+0 TNC configuration.
  • 3-pole, 3-module pluggable construction.
  • Visual indication system for device status.
  • DIN rail mounting for electrical panels.

Reliable Surge Protection for Three-Phase 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 electrical distribution boards.
  • Industrial automation systems.
  • Machine control panels.
  • Commercial switchboards.
  • Telecommunications and data infrastructure.
  • Building services and facilities systems.
  • 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-3P
Item number 83020132
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-C
Protection mode L-PE(N)
Number of poles 3 poles
Module width 3 modules
Format Pluggable
Mounting type DIN rail
Short circuit withstand 25 kA
Maximum back-up fuse 125 A gG
RoHS compliant Yes
EAN / UPC 8435297850915
HS Code 85363090
Country of Manufacture Spain
Poles 3-pole
Device Type Surge protection device
SPD Type Type 2
Earthing System TN-C
Nominal Discharge Current (In) 20 kA
Remote Signal No

Frequently Asked Questions

What is the Mersen STPT2-40K150V-3P used for?

It is used to protect three-phase 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-3P 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 nominal 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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