Mersen STPT2-40K320V-3P Type 2 surge protection device with 40 kA Imax, 277 / 480 V AC nominal operating voltage, 320 V AC maximum continuous operating voltage, 3+0 TNC configuration and pluggable DIN rail design.
£112.16
The Mersen STPT2-40K320V-3P (Part Number 83020136) 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), 320 V AC maximum continuous operating voltage (Uc) and pluggable modular construction, this SPD supports fast installation, simple cartridge replacement and dependable long-term protection in electrical distribution panels.
Designed for 277 / 480 V AC three-phase systems with a 3+0 TNC configuration, the STPT2-40K320V-3P is well suited to protecting automation equipment, machine control panels, commercial switchboards, building services and critical low-voltage electrical 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.
| Voltage | 480 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT2 Series - 40kA |
| Model | STPT2-40K320V-3P |
| Item number | 83020136 |
| 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 | 277 / 480 V AC |
| Maximum continuous operating voltage | 320 V AC |
| System configuration | 3+0 TNC |
| Number of poles | 3 poles |
| Module width | 3 modules |
| Format | Pluggable |
| Mounting type | DIN rail |
| Protection rating | IP20 |
| RoHS compliant | Yes |
| EAN / UPC | 8435297850977 |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It is used to protect three-phase low-voltage electrical installations and connected equipment against transient overvoltages caused by lightning activity and switching events.
The STPT2-40K320V-3P is a Type 2 / Class II surge protection device for electrical distribution and control systems.
This SPD has a 40 kA Imax maximum discharge current rating using an 8/20 μs waveform.
It is designed for 277 / 480 V AC three-phase systems with a 320 V AC maximum continuous operating voltage.
The device is designed for DIN rail mounting and uses a pluggable modular format for straightforward installation and maintenance.
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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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...