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K1-4P275 Mersen Surge Protector Type 1+2 SPD 4 Pole 230/400 Volt 20KA TNS
Mersen K1-4P275 Type 1+2 surge protection device with 275 V AC operating voltage, 4+0 configuration and pluggable DIN rail mounting for TNS 230/400 V AC electrical systems.
£245.24
Why Choose the Mersen 44120404 K1-4P275 Surge Protection Device?
The Mersen 44120404 K1-4P275 is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect three-phase low-voltage electrical installations against lightning currents and transient overvoltages. As part of the trusted Mersen Surge-Trap® K - K1 Series, this pluggable surge protector delivers reliable first-level protection for industrial, commercial and infrastructure applications requiring dependable power quality and system availability.
Designed for installation within the main distribution board, the K1-4P275 combines a compact DIN rail mounted design with a high surge current capacity. Its pluggable construction enables rapid replacement of protection modules during maintenance, reducing downtime whilst maintaining continuous protection of valuable electrical equipment.
With a 275 V AC maximum continuous operating voltage (Uc), a 4+0 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-4P275 is specifically designed for TNS 230/400 V AC three-phase electrical systems, providing dependable protection against lightning strikes and switching transients.
Key Advantages
- Reliable Type 1+2 surge protection for three-phase electrical installations.
- 4+0 internal configuration designed for TNS systems.
- Pluggable cartridge design enables rapid servicing and replacement.
- Suitable for 230/400 V AC three-phase networks.
- Compact DIN rail mounted construction saves enclosure 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.
- 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 4+0 protection configuration.
- Green (OK) / Not Green (Replace) visual status indication.
- Compact pluggable DIN rail mounted construction.
Reliable Protection Against Electrical Surges
The Mersen K1-4P275 safely diverts damaging lightning currents and transient overvoltages away from connected electrical equipment before they can affect switchgear, automation systems, motor drives, PLCs and other sensitive electronics. This helps minimise downtime, reduce maintenance costs and improve installation reliability.
Its high surge current capability, compact footprint and pluggable modular design make it an excellent choice for industrial facilities, commercial buildings, manufacturing plants and critical infrastructure where dependable surge protection is essential.
Typical Applications
- Main three-phase distribution boards.
- Industrial automation systems.
- Commercial buildings.
- Manufacturing facilities.
- Electrical switchboards.
- Infrastructure projects.
- Water treatment plants.
- TNS 230/400 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 | 400 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 | K1-4P275 | |
| Part Number | 44120404 | |
| EAN | 8435297888000 | |
| 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 | |
| Nominal operating voltage (Un) | 230/400 V AC | |
| Lightning impulse current (Iimp) | 12.5 kA | |
| Nominal Discharge Current (In) | 20 kA | |
| Maximum discharge current (Imax) | 50 kA | |
| Configuration | TN-S | |
| Number of poles | 4 | |
| System compatibility | TN-S | |
| Protection level (Up) | ≤1.5 kV | |
| Following current (Ifi) | 100 A | |
| 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 | |
| Dimensions (H × W × D) | Approx. 90 × 72 × 90 mm | |
| Weight | Approx. 0.641 kg | |
| RoHS compliant | Yes |
Frequently Asked Questions
What is the Mersen 44120404 K1-4P275 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 K1-4P275 is designed for TNS 230/400 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 K1-4P275 installed?
The surge protection device mounts onto a standard DIN rail inside the main electrical distribution board and features pluggable cartridges for quick servicing and replacement.
Trusted Protection for Critical Electrical Systems
Mersen Surge-Trap® K Series surge protection devices are trusted by electrical engineers and panel builders worldwide to provide dependable protection against lightning strikes and transient overvoltages in critical power distribution systems.
