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K2-4P440-M Mersen Surge Protector Type 2 SPD 4 Pole 230/400 Volt 20KA IT Remote Indication
Mersen 44020421 K2-4P440-M four-pole Type 2 surge protection device for 400/690 V AC TNS systems, featuring a 440 V AC maximum continuous operating voltage, 20 kA nominal discharge current, 50 kA maximum discharge current and integrated remote indication.
£128.52
Why Choose the Mersen 44020421 K2-4P440-M Surge Protection Device?
The Mersen 44020421, also known as the K2-4P440-M, is a high-performance Type 2 surge protection device (SPD) designed to protect low-voltage electrical installations against transient overvoltages caused by indirect lightning activity, utility disturbances and electrical switching events. Part of the Mersen Surge-Trap® K2 Series, this four-pole, pluggable SPD is suitable as a second level of surge protection in industrial and commercial power distribution systems.
The K2-4P440-M has a maximum continuous operating voltage of 440 V AC and is designed for 400/690 V AC TNS systems. Its four-pole 4+0 protection configuration provides protection between the live conductors and protective earth, helping safeguard switchgear, automation equipment, motor controls and other sensitive electrical systems.
With a nominal discharge current of 20 kA and a maximum discharge current of 50 kA, the Mersen 44020421 offers dependable protection against damaging 8/20 µs surge currents. An integrated remote indication microswitch enables connection to PLCs, alarms, SCADA platforms or building management systems, while the visual status indicator supports fast local inspection.
Key Advantages
- Reliable Type 2 surge protection for low-voltage electrical installations.
- 50 kA maximum discharge current for effective transient overvoltage protection.
- 20 kA nominal discharge current using an 8/20 µs surge waveform.
- Four-pole 4+0 configuration for TNS electrical systems.
- Suitable for 400/690 V AC installations.
- Integrated remote indication microswitch supports external monitoring.
- Visual status indication enables quick condition checks.
- Pluggable protection cartridges simplify maintenance and replacement.
- Compact DIN rail construction supports efficient 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.
- 400/690 V AC nominal operating voltage.
- 440 V AC maximum continuous operating voltage.
- 20 kA nominal discharge current.
- 50 kA maximum discharge current.
- Integrated remote indication contact.
- Green operational status indicator.
- Pluggable surge protection modules.
- Dynamic thermal disconnection.
- DIN rail mounting.
High-Voltage Surge Protection with Remote Monitoring
Transient overvoltages can originate from nearby lightning activity, utility switching, transformer operation and the switching of motors or other inductive loads. Although these events may last only a fraction of a second, they can damage power supplies, PLCs, variable-speed drives, instrumentation and communication equipment.
The Mersen K2-4P440-M diverts surge current away from connected equipment while its integrated microswitch provides remote status information. The contact can be connected to an alarm circuit, PLC, SCADA platform or building management system, enabling maintenance personnel to identify an end-of-life condition without opening the distribution board.
Typical Applications
- Industrial electrical distribution boards.
- 400/690 V AC TNS power systems.
- Commercial and infrastructure switchboards.
- Motor control centres.
- PLC and industrial automation panels.
- Variable-speed drive installations.
- Manufacturing and process-control systems.
- HVAC and building management systems.
- Remote monitoring and alarm installations.
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 | IT, TN-S | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | Yes | |
| Manufacturer | Mersen | |
| Series | Surge-Trap® K2 Series | |
| Model | K2-4P440-M | |
| Manufacturer part number | 44020421 | |
| EAN / GTIN | 8435297890010 | |
| Product type | Surge protection device | |
| IEC SPD classification | Class II | |
| EN SPD classification | Type 2 | |
| UL SPD classification | Type 1 Component Assembly | |
| Format | Pluggable | |
| Internal configuration | 4+0 | |
| Number of poles | 4 | |
| Nominal operating voltage | 400/690 V AC | |
| Nominal frequency | 50 / 60 Hz | |
| Maximum continuous operating voltage, Uc | 440 V AC | |
| Nominal Discharge Current (In) | 20 kA | |
| Maximum discharge current, Imax | 50 kA | |
| Surge waveform | 8/20 µs | |
| Protection modes | L-PE / N-PE | |
| System configuration | TN-S (also suitable for 230/400 V IT) | |
| 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 | |
| Approximate weight | 0.456 kg | |
| RoHS compliant | Yes | |
| HS Code | 85363090 | |
| Country of Manufacture | Spain |
Frequently Asked Questions
What is the Mersen 44020421 used for?
The Mersen 44020421 is a Type 2 surge protection device designed to protect 400/690 V AC TNS electrical installations and connected equipment against transient overvoltages.
What is the difference between the K2-4P440 and K2-4P440-M?
The K2-4P440-M includes an integrated microswitch for remote status indication. The standard K2-4P440 provides local visual indication but does not include the remote monitoring contact.
What surge current can the K2-4P440-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 44020421 is designed for 400/690 V AC TNS systems and uses a four-pole 4+0 internal protection configuration.
How does the remote indication function work?
An integrated volt-free microswitch changes state according to the condition of the SPD. It can be connected to an external alarm, PLC, SCADA platform or building management system for remote monitoring.
Can the surge protection cartridges be replaced?
Yes. The pluggable design allows individual protection cartridges 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 reliability, equipment availability and preventative maintenance in demanding industrial and commercial installations.
