Mersen K1-4P320 Type 1+2 surge protection device with 320 V AC operating voltage, 4+0 configuration and pluggable DIN rail mounting for TNS 277/480 V AC electrical systems.
£353.15
The Mersen 44120412 K1-4P320 is a premium Type 1+2 Surge Protection Device (SPD) engineered to protect three-phase low-voltage electrical installations against lightning currents and transient overvoltages. Part of the proven Mersen Surge-Trap® K - K1 Series, this pluggable SPD delivers reliable first-level surge protection for industrial, commercial and critical infrastructure applications where electrical system reliability is essential.
Designed for installation within the main distribution board, the K1-4P320 features a compact DIN rail mounted housing and replaceable pluggable protection modules, allowing fast servicing while maintaining continuous protection for valuable electrical equipment. Its robust construction and high surge current capability make it ideal for demanding power distribution environments.
With a 320 V AC maximum continuous operating voltage (Uc), a 4+0 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-4P320 is specifically designed for TNS 277/480 V AC three-phase electrical systems, providing dependable protection against direct lightning strikes and switching transients.
The Mersen K1-4P320 safely diverts lightning currents and transient overvoltages away from connected equipment before they can damage switchgear, PLCs, motor drives, control panels and other sensitive electronic systems. This helps minimise downtime, reduce maintenance costs and improve the long-term reliability of electrical installations.
Its combination of high surge current capability, modular pluggable construction and compact DIN rail mounting makes it an excellent choice for industrial facilities, commercial premises, manufacturing plants and critical infrastructure where dependable surge protection is required.
| Voltage | 480 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® K - K1 Series |
| Model | K1-4P320 |
| Part Number | 44120412 |
| EAN | 8435297888253 |
| Product type | Type 1+2 Surge Protection Device (SPD) |
| IEC SPD Type | Class I+II |
| UL SPD Type | Type 1 Component Assembly |
| Maximum continuous operating voltage (Uc) | 320 V AC |
| Nominal operating voltage (Un) | 277/480 V AC |
| Lightning impulse current (Iimp) | 12.5 kA |
| Nominal discharge current (In) | 20 kA |
| Maximum discharge current (Imax) | 50 kA |
| Protection modes | L-PE / N-PE |
| Configuration | 4+0 |
| Number of poles | 4 |
| System compatibility | TNS |
| Protection level (Up) | ≤1.5 kV |
| Rated short-circuit withstand (ISCCR) | 25 kA |
| Maximum back-up fuse | 315 A gG |
| Mounting type | DIN rail |
| Format | Pluggable |
| Protection rating | IP20 |
| Operating temperature | -40°C to +80°C |
| Housing material | PA6 CT1 & PA66 CT1 |
| Tightening torque | 3 Nm |
| Dimensions (H × W × D) | Approx. 90 × 72 × 90 mm |
| Weight | Approx. 0.63 kg |
| RoHS compliant | Yes |
It provides Type 1+2 surge protection for three-phase electrical installations against lightning currents, switching surges and transient overvoltages.
The K1-4P320 is designed for TNS 277/480 V AC three-phase electrical distribution systems.
The device features a 4+0 internal protection configuration, making it suitable for TNS electrical installations.
The SPD provides a 12.5 kA lightning impulse current, a 20 kA nominal discharge current and a 50 kA maximum discharge current.
The surge protection device mounts onto a standard DIN rail inside the main electrical distribution board and features replaceable pluggable cartridges for straightforward servicing.
Mersen Surge-Trap® K Series surge protection devices are trusted worldwide by electrical engineers, panel builders and contractors to protect critical power distribution systems from lightning strikes and 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...