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K1-4PG320 Mersen Surge Protector Type 1+2 SPD 4 Pole 277/480 Volt 20KA TT
Mersen K1-4PG320 Type 1+2 surge protection device with 320 V AC operating voltage, 3+1 configuration and pluggable DIN rail mounting for TT and TNS 277/480 V AC electrical systems.
£275.29
Why Choose the Mersen 44120408 K1-4PG320 Surge Protection Device?
The Mersen 44120408 K1-4PG320 is a premium Type 1+2 Surge Protection Device (SPD) developed to safeguard three-phase low-voltage electrical installations from lightning currents and transient overvoltages. As part of the proven Mersen Surge-Trap® K - K1 Series, this pluggable SPD provides reliable first-stage protection for commercial, industrial and infrastructure applications requiring dependable power system protection.
Designed for installation within the main distribution board, the K1-4PG320 combines high surge current capability with a compact DIN rail mounted design. Its modular pluggable construction enables rapid replacement of protection cartridges during maintenance, helping minimise downtime whilst maintaining continuous protection of valuable electrical equipment.
Featuring a 320 V AC maximum continuous operating voltage (Uc), a 3+1 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-4PG320 is specifically designed for TT and TNS 277/480 V AC three-phase electrical systems, providing effective protection against direct lightning currents and switching surges.
Key Advantages
- High-performance Type 1+2 surge protection for three-phase installations.
- 3+1 protection configuration optimised for TT and TNS systems.
- Compact pluggable cartridge design for quick maintenance.
- Suitable for 277/480 V AC three-phase networks.
- DIN rail mounted housing saves valuable panel space.
- Protects switchgear, PLCs, drives and sensitive electronic 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 3+1 protection configuration.
- Green (OK) / Not Green (Replace) visual status indication.
- Compact pluggable DIN rail mounted construction.
Reliable Protection Against Electrical Surges
The Mersen K1-4PG320 safely diverts damaging surge currents away from connected electrical equipment before they can reach motors, switchgear, PLCs, drives and sensitive control electronics. This helps reduce equipment failures, minimise downtime and improve the long-term reliability of electrical installations.
Its high lightning current capability, pluggable modular construction and compact footprint make it an ideal solution for industrial facilities, commercial buildings, renewable energy installations and critical infrastructure where dependable surge protection is essential.
Typical Applications
- Main three-phase distribution boards.
- Industrial automation systems.
- Commercial buildings.
- Manufacturing facilities.
- Infrastructure projects.
- Renewable energy installations.
- Water treatment plants.
- TT and 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, TT | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | No | |
| Manufacturer | Mersen | |
| Series | Surge-Trap® K - K1 Series | |
| Model | K1-4PG320 | |
| Part Number | 44120408 | |
| EAN | 8435297888222 | |
| 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 (L-N) | |
| Nominal operating voltage (Un) | 277/480 V AC | |
| Lightning impulse current (Iimp) | 12.5 kA (L-N), 50 kA (N-PE) | |
| Nominal Discharge Current (In) | 20 kA (L-N), 50 kA (N-PE) | |
| Maximum discharge current (Imax) | 50 kA (L-N), 100 kA (N-PE) | |
| Configuration | TN-S, TT | |
| Number of poles | 4 | |
| System compatibility | TN-S, TT | |
| Protection level (Up) | ≤1.5 kV | |
| Mounting type | DIN rail | |
| Format | Pluggable | |
| Protection rating | IP20 | |
| Operating temperature | -40°C to +80°C | |
| Maximum back-up fuse | 315 A gG | |
| Dimensions (H × W × D) | Approx. 90 × 72 × 90 mm | |
| Weight | Approx. 0.61 kg | |
| RoHS compliant | Yes |
Frequently Asked Questions
What is the Mersen 44120408 K1-4PG320 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 K1-4PG320 is designed for TT and TNS 277/480 V AC three-phase electrical distribution systems.
What is the protection configuration?
The device features a 3+1 internal protection configuration, providing enhanced protection for systems with a dedicated neutral conductor.
What surge current ratings does the device provide?
The SPD delivers a 12.5 kA lightning impulse current, 20 kA nominal discharge current and 50 kA maximum discharge current on the line modules.
How is the K1-4PG320 installed?
The device mounts onto a standard DIN rail inside the main electrical distribution board and uses replaceable pluggable cartridges for straightforward maintenance.
Trusted Protection for Critical Electrical Systems
Mersen Surge-Trap® K Series surge protection devices are trusted worldwide by electrical engineers and panel builders to provide dependable protection against lightning strikes and transient overvoltages in critical power distribution systems.
