Mersen STPT2-40K320V-2PG Type 2 surge protection device with 40 kA maximum discharge current, 320 V AC Uc, 277 V AC 1Ph+N 1+1 TT configuration and pluggable DIN rail mounting.
Original price was: £75.37.£60.30Current price is: £60.30.
The Mersen 83020118 is a dependable Type 2 surge protection device (SPD) designed to protect low voltage electrical installations from transient overvoltages caused by switching operations, grid disturbances and indirect lightning effects. Part of the Mersen Surge-Trap® Pluggable STPT2 Series, it provides reliable protection for commercial, industrial and automation environments.
The STPT2-40K320V-2PG is designed for 277 V AC 1Ph+N TT systems and provides a 40 kA maximum discharge current (Imax) with a 20 kA nominal discharge current (In). Its 1+1 TT configuration protects both line-to-neutral and neutral-to-earth paths, making it suitable for coordinated surge protection in distribution boards and electrical panels.
With a 320 V AC maximum continuous operating voltage (Uc), compact 2 pole, 2 module pluggable construction and DIN rail mounting, the Mersen 83020118 is ideal for protecting switchboards, control panels and sensitive electrical equipment from damaging voltage surges.
Type 2 surge protection devices help divert transient overvoltages away from connected electrical equipment, reducing the risk of component damage, nuisance failures and costly downtime. They are commonly used in distribution boards as part of a coordinated low voltage surge protection strategy.
The Mersen Surge-Trap® STPT2 Series combines high surge handling capability with a compact DIN rail format and replaceable pluggable cartridges, making it a practical choice for maintaining reliable electrical protection in demanding installations.
| Voltage | 277 V |
|---|---|
| Phase | Single Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT2 Series - 40 kA |
| Model | STPT2-40K320V-2PG |
| SKU | 83020118 |
| Product type | Type 2 Surge Protection Device |
| SPD class | Type 2 / Class II |
| Nominal operating voltage | 277 V AC |
| Maximum continuous operating voltage (Uc) | 320 V AC |
| Maximum discharge current (Imax) | 40 kA |
| Nominal discharge current (In) | 20 kA |
| Configuration | 1Ph+N, 1+1 TT |
| Number of poles | 2 Poles |
| Module width | 2 Modules |
| Assembly format | Pluggable |
| Mounting type | DIN rail |
| Remote indication | No |
| Protection rating | IP20 |
| Short circuit withstand (ISCCR) | 25 kA |
| Voltage protection level | ≤ 1.5 kV L-N, ≤ 1.5 kV N-PE |
| Standards | EN/IEC 61643-11, UL 1449 |
| Replacement cartridges | SP2-40K320V, SP2-40K-N |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It is used to protect low voltage single phase TT electrical systems from transient overvoltages caused by switching operations, grid disturbances and indirect lightning effects.
The Mersen 83020118 is a Type 2 / Class II surge protection device with a pluggable module design.
It is designed for 277 V AC 1Ph+N systems with a 320 V AC maximum continuous operating voltage.
1+1 TT refers to a surge protection configuration used in single phase TT systems, providing protection between line and neutral as well as neutral and protective earth.
Yes. The pluggable design allows the protection cartridges to be replaced quickly when required without replacing the complete surge protection assembly.
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and maintenance professionals to protect critical electrical infrastructure against damaging transient overvoltages.
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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...