Mersen STPT23-20K320V-4PG Type 2+3 surge protection device with 20 kA discharge capacity, 320 V AC continuous operating voltage and 3+1 TT four-pole configuration.
£117.34
The Mersen 83230128 is a high performance Type 2+3 Surge Protection Device (SPD) designed to protect low voltage electrical installations against transient overvoltages. Part of the Mersen Surge-Trap® Pluggable STPT23 Series, this device provides reliable protection for three-phase plus neutral electrical systems used in commercial, industrial and automation applications.
Engineered as a final stage of surge protection, the device diverts damaging voltage spikes caused by lightning strikes and switching operations away from sensitive electrical equipment. Its pluggable modular construction enables rapid replacement, helping minimise maintenance time while maintaining system protection.
With a maximum discharge current of 20 kA (8/20 μs), a 320 V AC continuous operating voltage (Uc) and a 3+1 TT configuration, the Mersen 83230128 is ideal for protecting switchboards, control panels, PLCs, drives and industrial automation equipment operating on 230/400 V AC and 277/480 V AC systems.
Surge protection devices safely divert transient overvoltages away from connected equipment before they can cause insulation failure, electronic damage or costly downtime. Installing an SPD helps improve equipment reliability and extends the service life of sensitive industrial electronics.
The Mersen Surge-Trap® STPT23 Series is designed as the final stage of surge protection in panels where upstream Type 2 protection is already installed, making it ideal for industrial automation, commercial buildings, telecommunications, water treatment facilities and renewable energy applications.
| Voltage | 480 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT23 Series |
| Model | STPT23-20K320V-4PG |
| SKU | 83230128 |
| Product type | Surge Protection Device (SPD) |
| SPD classification | Type 2+3 / Class II+III |
| Maximum discharge current (Imax) | 20 kA (8/20 μs) |
| Nominal discharge current (In) | 10 kA |
| Combined discharge voltage (Uoc) | 10 kV |
| Continuous operating voltage (Uc L-N) | 320 V AC |
| Continuous operating voltage (Uc N-PE) | 255 V AC |
| Nominal operating voltage (Un) | 230/400 V AC, 277/480 V AC |
| System configuration | 3+1 TT |
| Protection modes | L-N / N-PE |
| Number of poles | 4 |
| Number of modules | 4 |
| Mounting type | DIN rail |
| Protection rating | IP20 |
| Short circuit withstand (ISCCR) | 25 kA |
| Maximum back-up fuse | 63 A gG |
| Response time | 25 ns |
| Dimensions (H × W × D) | 90 × 72 × 70 mm |
| Weight | Approx. 0.34 kg |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It protects low voltage electrical installations and connected equipment against transient overvoltages caused by lightning strikes and switching events.
The Mersen 83230128 is a Type 2+3 / Class II+III surge protection device.
It is designed for 230/400 V AC and 277/480 V AC three-phase plus neutral TT systems using a 3+1 configuration.
The device features a pluggable four-module DIN rail design, allowing fast installation and simple cartridge replacement during maintenance.
The Mersen 83230128 provides a maximum discharge current of 20 kA (8/20 μs) with a nominal discharge current of 10 kA.
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and industrial maintenance professionals to safeguard critical electrical infrastructure against damaging transient overvoltages.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...