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Mersen Surge Protector Type 2 SPD 2 Pole 277 Volt 20KA TT
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.
This product has been discontinued
A direct replacement is available below.
Replacement product
K2-2PG320 Mersen Surge Protector Type 2 SPD 2 Pole 277 Volt 20KA TT
SKU: 44020208
£61.19 ex VAT
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Why Choose the Mersen 83020118 Surge Protection Device?
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.
Key Advantages
- Compact Type 2 surge protection device for low voltage installations.
- 40 kA maximum discharge current (Imax).
- 20 kA nominal discharge current (In).
- 320 V AC maximum continuous operating voltage (Uc).
- 1+1 TT configuration for 277 V AC single phase systems.
- Pluggable module design for quick replacement and reduced maintenance time.
Key Features
- Mersen Surge-Trap® Pluggable STPT2 Series.
- Type 2 / Class II surge protection.
- 40 kA Imax (8/20 μs).
- 20 kA In (8/20 μs).
- 277 V AC nominal operating voltage.
- 320 V AC Uc.
- 1Ph+N, 1+1 TT configuration.
- 2 pole, 2 module DIN rail mounted design.
Reliable Protection Against Electrical 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.
Typical Applications
- Single phase 277 V TT electrical systems.
- Commercial distribution boards.
- Industrial control panels.
- PLC and automation systems.
- Building electrical services.
- Low voltage power distribution equipment.
Technical Specifications
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| Voltage | 277 V | |
|---|---|---|
| Phase | Single Phase | |
| Poles | 2-pole | |
| Device Type | Surge protection device | |
| SPD Type | Type 2 | |
| Earthing System | TN-S, TT | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | No | |
| 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 | TN-S, 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 |
Frequently Asked Questions
What is the Mersen 83020118 used for?
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.
What type of surge protection device is it?
The Mersen 83020118 is a Type 2 / Class II surge protection device with a pluggable module design.
What voltage is this SPD designed for?
It is designed for 277 V AC 1Ph+N systems with a 320 V AC maximum continuous operating voltage.
What does 1+1 TT mean?
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.
Can the protection cartridges be replaced?
Yes. The pluggable design allows the protection cartridges to be replaced quickly when required without replacing the complete surge protection assembly.
Trusted by Electrical Professionals Worldwide
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.
