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Mersen Surge Protector Type 2 SPD 3 Pole 400/690 Volt 20KA IT Remote Indication
Mersen STPT2-40K440V-3PM Type 2 surge protection device with 40 kA Imax, 400 / 690 V AC nominal operating voltage, 440 V AC maximum continuous operating voltage, 3+0 IT / TNC configuration, pluggable DIN rail design and remote indication.
This product has been discontinued
A direct replacement is available below.
Replacement product
K2-3P440-M Mersen Surge Protector Type 2 SPD 3 Pole 400/690 Volt 20KA IT Remote Indication
SKU: 44020309
£98.43 ex VAT
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Why Choose the Mersen STPT2-40K440V-3PM Surge Protection Device?
The Mersen STPT2-40K440V-3PM (Part Number 83020143) is a high-performance Type 2 surge protection device (SPD) designed to protect three-phase 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 reliable protection for industrial, commercial and infrastructure electrical systems.
Featuring a 40 kA maximum discharge current (Imax), 440 V AC maximum continuous operating voltage (Uc), pluggable modular construction and remote indication, this SPD supports straightforward installation, rapid cartridge replacement and external monitoring of protection status.
Designed for 400 / 690 V AC three-phase systems with a 3+0 IT / TNC configuration, the STPT2-40K440V-3PM 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 low-voltage systems.
- 40 kA maximum discharge current for effective transient overvoltage protection.
- 440 V AC maximum continuous operating voltage for higher voltage installations.
- Remote indication for external SPD status monitoring.
- Pluggable cartridge design simplifies replacement and maintenance.
- Compact 3-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).
- 400 / 690 V AC nominal operating voltage.
- 440 V AC maximum continuous operating voltage (Uc).
- Three-phase, 3+0 IT / TNC configuration.
- 3-pole, 3-module pluggable construction.
- Remote indication contact for external monitoring.
- Visual indication system for local device status checks.
- 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, visual indication and remote monitoring, 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.
- Building management systems.
- Telecommunications and data infrastructure.
- Water treatment facilities.
- Low-voltage installations requiring 400 / 690 V AC surge protection with remote monitoring.
Technical Specifications
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| Voltage | 690 V | |
|---|---|---|
| Phase | Three Phase | |
| Poles | 3-pole | |
| Device Type | Surge protection device | |
| SPD Type | Type 2 | |
| Earthing System | IT, TN-C | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | Yes | |
| Manufacturer | Mersen | |
| Series | Surge-Trap® Pluggable STPT2 Series - 40kA | |
| Model | STPT2-40K440V-3PM | |
| Item number | 83020143 | |
| 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 | 400 / 690 V AC | |
| Maximum continuous operating voltage | 440 V AC | |
| System configuration | TN-C (also suitable for 400 V IT) | |
| Number of poles | 3 poles | |
| Module width | 3 modules | |
| Format | Pluggable | |
| Remote indication | Yes | |
| Mounting type | DIN rail | |
| Protection rating | IP20 | |
| RoHS compliant | Yes | |
| EAN / UPC | 8435297851738 | |
| HS Code | 85363090 | |
| Country of Manufacture | Spain |
Frequently Asked Questions
What is the Mersen STPT2-40K440V-3PM 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 STPT2-40K440V-3PM 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.
Does this model include remote indication?
Yes. The STPT2-40K440V-3PM includes remote indication, allowing the device status to be monitored through external signalling or control systems.
What voltage is this model designed for?
It is designed for 400 / 690 V AC three-phase systems with a 440 V AC maximum continuous operating voltage.
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.
