Standard delivery
£8 ex VAT · free over £200UK parcel delivery is £8 ex VAT, or free on orders over £200 ex VAT.
Heavier items may be charged at a weight-based or pallet rate, shown at checkout.
K1-3P275 Mersen Surge Protector Type 1+2 SPD 3 Pole 400 Volt 20KA TNC
Mersen K1-3P275 Type 1+2 surge protection device with 275 V AC operating voltage, 12.5 kA lightning impulse current and pluggable DIN rail design for TNC three-phase electrical systems.
£185.85
Why Choose the Mersen 44120300 K1-3P275 Surge Protection Device?
The Mersen 44120300 K1-3P275 is a robust Type 1+2 Surge Protection Device (SPD) engineered to protect three-phase low-voltage electrical installations from lightning strikes and transient overvoltages. Part of the trusted Mersen Surge-Trap® K - K1 Series, this pluggable surge protector provides dependable first-level protection for industrial, commercial and infrastructure applications.
Designed for installation within the main distribution board, the K1-3P275 combines high surge current capability with a compact DIN rail mounted design. Its pluggable construction enables quick replacement during servicing, helping minimise maintenance time while ensuring continuous protection of critical electrical equipment.
With a 275 V AC maximum continuous operating voltage (Uc), 3+0 protection configuration and a 12.5 kA lightning impulse current (Iimp), the K1-3P275 is ideally suited to TNC three-phase 400 V electrical systems requiring reliable surge protection.
Key Advantages
- Reliable Type 1+2 surge protection for three-phase low-voltage installations.
- 275 V AC operating voltage for 400 V TNC electrical systems.
- Pluggable design allows quick servicing and replacement.
- Compact DIN rail mounted construction.
- Designed for TNC three-phase distribution networks.
- Protects valuable electrical equipment against lightning and switching surges.
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).
- 3-pole, 3+0 protection configuration.
- Visual end-of-life status indicator.
- Compact pluggable DIN rail mounted housing.
Reliable Protection Against Electrical Surges
The Mersen K1-3P275 safely diverts high-energy surge currents away from connected equipment before they can damage switchgear, drives, motors and sensitive electronic systems. This helps improve installation reliability, reduce maintenance costs and minimise operational downtime.
Its high surge capacity and compact pluggable design make it an excellent choice for industrial control panels, commercial buildings, manufacturing facilities and critical infrastructure where dependable surge protection is essential.
Typical Applications
- Main three-phase distribution boards.
- Industrial control panels.
- Manufacturing plants.
- Commercial buildings.
- Infrastructure projects.
- Electrical switchboards.
- Water treatment facilities.
- Three-phase power distribution systems.
Technical Specifications
Tick the specs you need, then view products that match.
| Impulse Current Iimp (kA) | 12.5 kA | |
|---|---|---|
| SPD Type | Type 1+2 | |
| Voltage | 400 V | |
| Phase | Three Phase | |
| Poles | 3-pole | |
| Device Type | Surge protection device | |
| Earthing System | TN-C | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | No | |
| Manufacturer | Mersen | |
| Series | Surge-Trap® K - K1 Series | |
| Model | K1-3P275 | |
| Part Number | 44120300 | |
| 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-C | |
| Number of poles | 3 | |
| System compatibility | TN-C | |
| Protection level (Up) | ≤1.5 kV | |
| Mounting type | DIN rail | |
| Format | Pluggable | |
| Protection rating | IP20 | |
| Dimensions (H × W × D) | Approx. 90 × 54 × 90 mm | |
| Weight | Approx. 0.49 kg |
Frequently Asked Questions
What is the Mersen 44120300 K1-3P275 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 K1-3P275 is designed for TNC three-phase 230/400 V AC electrical distribution systems.
What is the maximum continuous operating voltage?
The device has a maximum continuous operating voltage (Uc) of 275 V AC.
What surge current ratings does the device provide?
The SPD features a 12.5 kA lightning impulse current, 20 kA nominal discharge current and 50 kA maximum discharge current.
How is the surge protection device installed?
The K1-3P275 is supplied in a pluggable housing for installation onto a standard DIN rail inside a main electrical distribution board.
Trusted Protection for Three-Phase Electrical Installations
Mersen Surge-Trap® K Series surge protection devices are trusted worldwide by electrical engineers and contractors for protecting three-phase electrical systems against lightning strikes and transient overvoltages.
