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K2-3P275 Mersen Surge Protector Type 2 SPD 3 Pole 400 Volt 20KA TNC
Mersen 44020300 K2-3P275 Type 2 three-pole surge protection device for 230/400 V TN-C systems with 275 V AC maximum continuous operating voltage, 20 kA nominal discharge current and 50 kA maximum discharge current.
£77.89
Why Choose the Mersen 44020300 K2-3P275 Surge Protection Device?
The Mersen 44020300, also identified as the K2-3P275, is a high-performance Type 2 surge protection device (SPD) designed to protect three-phase low-voltage electrical installations against transient overvoltages. Part of the trusted Mersen Surge-Trap K2 series, it provides reliable protection for 230/400 V TN-C electrical systems, helping safeguard switchgear, motors, drives and sensitive electronic equipment from lightning-induced surges and switching transients.
The K2-3P275 features a compact pluggable construction that allows the protection cartridges to be replaced without removing the complete DIN-rail base. A clear visual status indicator enables quick inspection of the operational condition, simplifying routine maintenance and ensuring continuous surge protection.
With a 230/400 V AC nominal operating voltage, a 275 V AC maximum continuous operating voltage, a 20 kA nominal discharge current and a 50 kA maximum discharge current, the Mersen 44020300 delivers dependable protection for commercial buildings, industrial facilities and infrastructure installations. Its three-module DIN-rail design makes installation straightforward within distribution boards and motor control centres.
Key Advantages
- Reliable Type 2 surge protection for three-phase TN-C electrical systems.
- 50 kA maximum discharge current for excellent transient overvoltage protection.
- Compact pluggable construction for simplified maintenance.
- Visual operating status indicator for rapid inspection.
- High short-circuit withstand capability.
- Suitable for commercial, industrial and infrastructure installations.
Key Features
- Mersen Surge-Trap K2 series.
- Type 2 / Class II surge protection device.
- 3+0 internal configuration.
- Three-pole design.
- 230/400 V AC nominal operating voltage.
- 275 V AC maximum continuous operating voltage (Uc).
- 20 kA nominal discharge current (In).
- 50 kA maximum discharge current (Imax).
- Protection mode: L-PE(N).
- Dynamic thermal disconnection.
- Visual operating status indicator.
- Pluggable DIN-rail construction.
Reliable Surge Protection for Three-Phase Electrical Systems
Transient overvoltages generated by indirect lightning strikes, utility switching and inductive electrical loads can damage PLCs, motor drives, switchgear, communication equipment and power supplies. Installing a dedicated Type 2 surge protection device helps reduce costly equipment failures while improving electrical system reliability.
The Mersen K2-3P275 combines high surge current capability, fast response and replaceable protection cartridges, providing dependable long-term protection whilst simplifying routine maintenance in commercial and industrial installations.
Typical Applications
- Three-phase TN-C distribution boards.
- Industrial switchgear and motor control centres.
- Commercial electrical installations.
- Manufacturing and process automation.
- Building services and infrastructure projects.
- Protection of drives, PLCs and sensitive electronic equipment.
Technical Specifications
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| Voltage | 400 V | |
|---|---|---|
| Phase | Three Phase | |
| Poles | 3-pole | |
| Device Type | Surge protection device | |
| SPD Type | Type 2 | |
| Earthing System | TN-C | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | No | |
| Manufacturer | Mersen | |
| Series | Surge-Trap K2 | |
| Model | K2-3P275 | |
| SKU / Part number | 44020300 | |
| Product type | Surge protection device | |
| IEC SPD classification | Type 2 / Class II | |
| UL SPD classification | Type 1 Component Assembly | |
| Internal configuration | 3+0 | |
| Number of poles | 3 | |
| Network configuration | TN-C | |
| Protection mode | L-PE(N) | |
| Nominal operating voltage | 230/400 V AC | |
| Maximum continuous operating voltage | 275 V AC | |
| Nominal discharge current | 20 kA | |
| Maximum discharge current | 50 kA | |
| Voltage protection level | ≤1.5 kV | |
| Response time | ≤25 ns | |
| Residual current | <1 mA | |
| Short-circuit withstand rating | 25 kA | |
| Maximum back-up fuse | 315 A gG | |
| Dynamic thermal disconnection | Yes | |
| Status indication | Green (OK) / Not green (replace) | |
| Protection rating | IP20 | |
| Mounting type | DIN rail | |
| DIN rail modules | 3 | |
| Terminal tightening torque | 3 Nm | |
| Replacement cartridge | Mersen 44020001 | |
| Dimensions (H × W × D) | 90 × 54 × 74.4 mm | |
| Weight | approx. 0.362 kg | |
| EAN | 8435297889885 | |
| RoHS compliant | Yes | |
| HS Code | 85363090 | |
| Country of Manufacture | Spain |
Frequently Asked Questions
What is the Mersen 44020300 used for?
The Mersen 44020300 protects three-phase TN-C electrical installations against transient overvoltages caused by lightning activity, switching operations and inductive loads.
What type of surge protection device is the K2-3P275?
It is a Type 2 / Class II surge protection device designed for secondary surge protection in three-phase low-voltage electrical installations.
What discharge current can the device withstand?
The K2-3P275 is rated for a 20 kA nominal discharge current and a 50 kA maximum discharge current using the standard 8/20 µs surge waveform.
Does the Mersen 44020300 include remote signalling?
No. This model provides local visual status indication only. For applications requiring remote monitoring, Mersen also offers the K2-3P275-M variant.
Can the protection cartridges be replaced?
Yes. The pluggable design allows the protection cartridges to be replaced without removing the complete DIN-rail base, reducing maintenance time.
Trusted Surge Protection from Mersen
Mersen Surge-Trap K2 surge protection devices are trusted by electrical engineers, panel builders and maintenance professionals to protect critical three-phase electrical systems against damaging transient overvoltages.
