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K1-4P320 Mersen Surge Protector Type 1+2 SPD 4 Pole 277/480 Volt 20KA TNS
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.
£264.86
Why Choose the Mersen 44120412 K1-4P320 Surge Protection Device?
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.
Key Advantages
- High-performance Type 1+2 surge protection for three-phase electrical installations.
- 4+0 protection configuration designed specifically for TNS systems.
- Pluggable cartridge design enables quick servicing and replacement.
- Suitable for 277/480 V AC three-phase networks.
- Compact DIN rail mounted construction maximises panel space.
- Protects switchgear, PLCs, drives and sensitive electrical equipment against lightning and transient overvoltages.
Key Features
- Mersen Surge-Trap® K - K1 Series.
- IEC Class I+II / Type 1+2 surge protection device.
- 320 V AC maximum continuous operating voltage (Uc).
- 12.5 kA lightning impulse current (Iimp).
- 20 kA nominal discharge current (In).
- 50 kA maximum discharge current (Imax).
- Four-pole 4+0 protection configuration.
- Green (OK) / Not Green (Replace) visual indication.
- Compact pluggable DIN rail mounted construction.
Reliable Protection Against Electrical Surges
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.
Typical Applications
- Main three-phase distribution boards.
- Industrial automation systems.
- Commercial buildings.
- Manufacturing facilities.
- Electrical switchboards.
- Infrastructure projects.
- Water treatment plants.
- TNS 277/480 V AC three-phase electrical systems.
Technical Specifications
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| Impulse Current Iimp (kA) | 12.5 kA | |
|---|---|---|
| SPD Type | Type 1+2 | |
| Voltage | 480 V | |
| Phase | Three Phase | |
| Poles | 4-pole | |
| Device Type | Surge protection device | |
| Earthing System | TN-S | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | No | |
| 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 | TN-S | |
| Number of poles | 4 | |
| System compatibility | TN-S | |
| 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 |
Frequently Asked Questions
What is the Mersen 44120412 K1-4P320 used for?
It provides Type 1+2 surge protection for three-phase electrical installations against lightning currents, switching surges and transient overvoltages.
Which electrical systems is this SPD suitable for?
The K1-4P320 is designed for TNS 277/480 V AC three-phase electrical distribution systems.
What is the protection configuration?
The device features a 4+0 internal protection configuration, making it suitable for TNS electrical installations.
What surge current ratings does the device provide?
The SPD provides a 12.5 kA lightning impulse current, a 20 kA nominal discharge current and a 50 kA maximum discharge current.
How is the K1-4P320 installed?
The surge protection device mounts onto a standard DIN rail inside the main electrical distribution board and features replaceable pluggable cartridges for straightforward servicing.
Trusted Protection for Critical Electrical Systems
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.
