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K2-4P275-M Mersen Surge Protector Type 2 SPD 4 Pole 230/400 Volt 20KA TNS Remote Indication
Mersen 44020405 K2-4P275-M four-pole Type 2 surge protection device for 230/400 V AC TNS systems, featuring a 20 kA nominal discharge current, 50 kA maximum discharge current and integrated remote indication.
£119.00
Why Choose the Mersen 44020405 K2-4P275-M Surge Protection Device?
The Mersen 44020405, also known as the K2-4P275-M, is a high-performance Type 2 surge protection device (SPD) designed to protect low-voltage electrical installations against transient overvoltages caused by induced lightning surges and electrical switching events. Part of the Mersen Surge-Trap® K2 Series, this four-pole, pluggable device provides dependable surge protection for three-phase TNS power distribution systems.
Featuring a 4+0 internal configuration, the K2-4P275-M provides L-PE and N-PE protection across four poles. It has a nominal discharge current of 20 kA and a maximum discharge current of 50 kA, helping protect industrial machinery, automation equipment, control panels and sensitive electronic systems from damaging voltage transients.
The Mersen 44020405 is designed for 230/400 V AC networks and has a maximum continuous operating voltage of 275 V AC. Its integrated microswitch provides remote status indication, allowing the condition of the SPD to be monitored through a PLC, alarm circuit, SCADA platform or building management system. Pluggable protection cartridges and DIN rail mounting also simplify installation and maintenance.
Key Advantages
- Reliable Type 2 surge protection for three-phase TNS installations.
- 50 kA maximum discharge current for effective transient overvoltage protection.
- 20 kA nominal discharge current using an 8/20 µs waveform.
- Four-pole 4+0 configuration for comprehensive conductor protection.
- Integrated remote indication microswitch supports external status monitoring.
- Pluggable protection cartridges simplify inspection and replacement.
- Visual status indication provides clear end-of-life monitoring.
- Compact DIN rail design enables straightforward panel installation.
Key Features
- Mersen Surge-Trap® K2 Series.
- Type 2 / IEC Class II surge protection device.
- UL Type 1 Component Assembly.
- Four-pole 4+0 internal configuration.
- 230/400 V AC nominal operating voltage.
- 275 V AC maximum continuous operating voltage.
- 20 kA nominal discharge current.
- 50 kA maximum discharge current.
- ≤1.5 kV voltage protection level at nominal discharge current.
- Integrated visual and remote status indication.
- Dynamic thermal disconnection with open-circuit failure mode.
- Pluggable modules with DIN rail mounting.
Surge Protection with Remote Status Monitoring
Transient overvoltages can be generated by indirect lightning activity, utility network disturbances and the switching of motors, transformers or other inductive loads. These short-duration voltage spikes may damage control equipment, power supplies, variable speed drives and other sensitive electrical devices.
The Mersen K2-4P275-M safely diverts surge current away from connected equipment while its integrated microswitch provides a remote indication of device condition. Maintenance teams can connect this contact to an alarm, PLC or building management system, allowing deterioration or end-of-life status to be identified without manually inspecting the distribution board.
Typical Applications
- Industrial electrical distribution boards.
- Commercial switchboards and building services.
- Motor control centres and machinery panels.
- PLC and industrial automation systems.
- Manufacturing and process-control equipment.
- HVAC and facilities-management systems.
- Remote monitoring and alarm installations.
- Three-phase 230/400 V AC TNS networks.
Technical Specifications
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| Voltage | 400 V | |
|---|---|---|
| Phase | Three Phase | |
| Poles | 4-pole | |
| Device Type | Surge protection device | |
| SPD Type | Type 2 | |
| Earthing System | TN-S | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | Yes | |
| Manufacturer | Mersen | |
| Series | Surge-Trap® K2 Series | |
| Model | K2-4P275-M | |
| Manufacturer part number | 44020405 | |
| EAN / UPC | 8435297889946 | |
| Product type | Surge protection device | |
| IEC SPD classification | Class II | |
| EN SPD classification | Type 2 | |
| UL SPD classification | Type 1 Component Assembly | |
| Internal configuration | 4+0 | |
| Nominal operating voltage | 230/400 V AC | |
| Nominal frequency | 50 / 60 Hz | |
| Maximum continuous operating voltage | 275 V AC | |
| Nominal Discharge Current (In) | 20 kA | |
| Maximum discharge current, Imax | 50 kA | |
| Voltage protection level, Up | ≤1.5 kV | |
| Typical surge current | 5 kA over 200 impulses | |
| Response time | ≤25 ns | |
| Residual current | <1 mA | |
| Protection modes | L-PE / N-PE | |
| System configuration | TN-S | |
| Number of poles | 4 | |
| DIN rail modules | 4 | |
| IEC short-circuit withstand | 25 kA | |
| UL short-circuit current rating | 85 kA | |
| Maximum back-up fuse | 315 A gG | |
| Thermal disconnection | Dynamic | |
| Thermal protection behaviour | Open Circuit Mode | |
| Remote indication | Integrated microswitch | |
| Remote contact rating | 250 V AC at 0.5 A / 30 V DC at 1 A | |
| Status indication | Green operational / not green replace | |
| Protection rating | IP20 | |
| Mounting type | DIN rail | |
| Connection torque | 3 N·m | |
| Solid conductor capacity | 1.5–35 mm² | |
| Stranded conductor capacity | 1.5–25 mm² | |
| Remote indication conductor capacity | 0.5–1.5 mm² | |
| Operating temperature | -40 to +85 °C | |
| Operating humidity | 5–95% | |
| Maximum installation altitude | 4,000 m | |
| Housing material | PA6 CT1 and PA66 CT1 | |
| Housing colour | Grey, RAL 7035 | |
| Flammability rating | UL94 V-0 | |
| Replacement cartridge | Mersen 44020001 K2-275 | |
| Dimensions (H × W × D) | 90 × 72 × 74.4 mm | |
| Weight | approx. 0.435 kg | |
| RoHS compliant | Yes | |
| HS Code | 85363090 | |
| Country of Manufacture | Spain |
Frequently Asked Questions
What is the Mersen 44020405 used for?
The Mersen 44020405 is a Type 2 surge protection device used to protect three-phase TNS electrical installations and connected equipment against transient overvoltages caused by induced lightning surges and switching events.
What is the difference between the K2-4P275 and K2-4P275-M?
The K2-4P275-M includes an integrated microswitch for remote status indication, while the standard K2-4P275 provides visual condition indication without the remote monitoring contact.
What surge current can the K2-4P275-M handle?
The device has a nominal discharge current of 20 kA and a maximum discharge current of 50 kA using an 8/20 µs surge waveform.
Which electrical systems are compatible with this SPD?
The Mersen 44020405 is designed for 230/400 V AC TNS systems and uses a four-pole 4+0 internal protection configuration.
Can the surge protection cartridges be replaced?
Yes. The device uses pluggable protection cartridges, allowing individual modules to be replaced without removing the complete DIN rail base from the electrical panel.
Trusted Surge Protection from Mersen
Mersen Surge-Trap® K2 Series devices provide dependable protection against transient overvoltages while supporting electrical safety, equipment reliability and service continuity in demanding industrial and commercial installations.
