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K1-4PG275 Mersen Surge Protector Type 1+2 SPD 4 Pole 230/400 Volt 20KA TT
Mersen K1-4PG275 Type 1+2 surge protection device with 275 V AC operating voltage, 3+1 protection configuration, 12.5 kA lightning impulse current and pluggable DIN rail construction for TT and TNS three-phase systems.
£261.18
Why Choose the Mersen 44120400 K1-4PG275 Surge Protection Device?
The Mersen 44120400 K1-4PG275 is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect three-phase low-voltage electrical installations against lightning strikes and transient overvoltages. Part of the trusted Mersen Surge-Trap® K - K1 Series, this pluggable SPD provides reliable protection for commercial, industrial and infrastructure applications where electrical system continuity is essential.
Designed for installation at the main distribution board, the K1-4PG275 combines high surge current capability with a compact DIN rail mounted design. Its modular pluggable construction enables fast cartridge replacement, reducing maintenance time while ensuring continuous protection of valuable electrical equipment.
With a 275 V AC maximum continuous operating voltage (Uc), a 3+1 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-4PG275 is ideally suited for TT and TNS 230/400 V AC three-phase electrical systems, providing dependable protection against direct lightning currents and switching transients.
Key Advantages
- Reliable Type 1+2 surge protection for three-phase electrical installations.
- 3+1 internal configuration for TT and TNS network protection.
- Pluggable cartridge design enables rapid servicing and replacement.
- Suitable for 230/400 V AC three-phase systems.
- Compact DIN rail mounted construction saves panel space.
- Protects switchgear, drives, PLCs and other 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.
- 275 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.
- Visual Green (OK) / Not Green (Replace) status indication.
- Compact pluggable DIN rail mounted housing.
Reliable Protection Against Electrical Surges
The Mersen K1-4PG275 safely diverts high-energy surge currents away from connected equipment before they can damage motors, switchgear, PLCs, automation systems and other sensitive electrical devices. This helps minimise downtime, reduce maintenance costs and improve the long-term reliability of electrical installations.
Its high surge capacity, compact footprint and replaceable cartridges make it an excellent solution for industrial facilities, commercial buildings, renewable energy installations 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.
- Renewable energy installations.
- Water treatment facilities.
- TT and TNS three-phase power distribution systems.
Technical Specifications
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| Impulse Current Iimp (kA) | 12.5 kA | |
|---|---|---|
| SPD Type | Type 1+2 | |
| Voltage | 400 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 | K1-4PG275 | |
| Part Number | 44120400 | |
| EAN | 8435297888208 | |
| 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) | 275 V AC (L-N), 255 V AC (N-PE) | |
| Nominal operating voltage (Un) | 230/400 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 | |
| Dimensions (H × W × D) | Approx. 90 × 72 × 98 mm | |
| Weight | Approx. 0.61 kg |
Frequently Asked Questions
What is the Mersen 44120400 K1-4PG275 used for?
It provides Type 1+2 surge protection for three-phase low-voltage electrical installations against lightning strikes and transient overvoltages.
Which electrical systems is this SPD suitable for?
The K1-4PG275 is designed for TT and TNS 230/400 V AC three-phase electrical distribution systems.
What is the protection configuration?
The device uses a 3+1 internal protection configuration, making it suitable for installations with a dedicated neutral conductor.
What surge current ratings does the device provide?
The SPD provides a 12.5 kA lightning impulse current per phase, a 20 kA nominal discharge current and a 50 kA maximum discharge current for the line modules.
How is the surge protection device installed?
The K1-4PG275 mounts onto a standard DIN rail inside the main electrical distribution board and features replaceable pluggable protection cartridges.
Trusted Protection for Three-Phase Electrical Systems
Mersen Surge-Trap® K Series surge protection devices are trusted worldwide by electrical engineers and panel builders for delivering dependable protection against lightning strikes and transient overvoltages in critical electrical installations.
