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K2-3P275-M Mersen Surge Protector Type 2 SPD 3 Pole 400 Volt 20KA TNC Remote Indication

K2-3P275-M Mersen Surge Protector Type 2 SPD 3 Pole 400 Volt 20KA TNC Remote Indication

Mersen 44020301 K2-3P275-M Type 2 three-pole surge protection device with integrated remote signalling, 275 V AC maximum continuous operating voltage, 20 kA nominal discharge current and 50 kA maximum discharge current.

SKU: 44020301Alt SKU: K2-3P275-MMPN: 44020301
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List Price £121.51 ex VAT
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Why Choose the Mersen 44020301 K2-3P275-M Surge Protection Device?

The Mersen 44020301, also known as the K2-3P275-M, is a high-performance Type 2 surge protection device (SPD) designed to protect three-phase low-voltage electrical installations from transient overvoltages. Part of the trusted Mersen Surge-Trap K2 series, it provides reliable protection for 230/400 V TN-C electrical systems while incorporating an integrated remote signalling contact for continuous monitoring of the device status.

Its pluggable design enables the protection modules to be replaced quickly without removing the complete DIN-rail base, minimising maintenance time and reducing downtime. A visual status indicator provides instant local inspection, while the integrated microswitch allows remote monitoring through PLCs, SCADA systems or building management systems.

Featuring a 275 V AC maximum continuous operating voltage, 20 kA nominal discharge current and 50 kA maximum discharge current, the Mersen 44020301 offers dependable protection against lightning-induced surges and switching transients in commercial, industrial and infrastructure applications.

Key Advantages

  • Reliable Type 2 surge protection for three-phase TN-C systems.
  • Integrated remote signalling for continuous condition monitoring.
  • 50 kA maximum discharge current for high surge handling capability.
  • Pluggable cartridge design simplifies maintenance.
  • Visual operating status indicator for quick inspections.
  • Compact DIN-rail installation for distribution boards and control panels.

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).
  • Integrated remote signalling microswitch.
  • Protection mode: L-PE(N).
  • Dynamic thermal disconnection.
  • Pluggable DIN-rail construction.

Reliable Three-Phase Surge Protection with Remote Monitoring

Transient overvoltages caused by lightning activity, utility switching and inductive loads can damage PLCs, motor drives, switchgear, communication equipment and sensitive electronics. Installing a dedicated Type 2 SPD significantly reduces the risk of equipment failure and costly downtime.

The Mersen K2-3P275-M combines high surge current capability with integrated remote signalling, allowing maintenance personnel to monitor protection status remotely while benefiting from rapid replacement of the pluggable protection modules whenever servicing is required.

Typical Applications

  • Three-phase TN-C distribution boards.
  • Industrial switchgear and motor control centres.
  • Commercial electrical installations.
  • PLC and automation systems.
  • Building management and SCADA systems.
  • Protection of drives, power supplies and sensitive electronic equipment.

Technical Specifications

Voltage 400 V
Phase Three Phase
Manufacturer Mersen
Series Surge-Trap K2
Model K2-3P275-M
SKU / Part number 44020301
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 25 kA
Maximum back-up fuse 315 A gG
Dynamic thermal disconnection Yes
Status indication Green (OK) / Not green (replace)
Remote signalling Integrated microswitch
Protection rating IP20
Mounting type DIN rail
DIN rail modules 3
Replacement cartridge Mersen 44020001
Dimensions (H × W × D) 90 × 54 × 74.4 mm
Weight approx. 0.39 kg
EAN 8435297889694
RoHS compliant Yes
HS Code 85363090
Country of Manufacture Spain
Poles 3-pole
Device Type Surge protection device
SPD Type Type 2
Earthing System TN-C
Nominal Discharge Current (In) 20 kA
Remote Signal Yes

Frequently Asked Questions

What is the Mersen 44020301 used for?

The Mersen 44020301 protects three-phase TN-C electrical installations against transient overvoltages while providing remote monitoring of the surge protection status.

What type of surge protection device is the K2-3P275-M?

It is a Type 2 / Class II surge protection device designed for secondary surge protection in low-voltage three-phase electrical systems.

Does the K2-3P275-M include remote signalling?

Yes. An integrated microswitch provides remote status indication to PLCs, SCADA systems and building management systems.

What discharge current can the device withstand?

The device is rated for a 20 kA nominal discharge current and a 50 kA maximum discharge current using the standard 8/20 µs waveform.

Can the protection modules be replaced?

Yes. The pluggable construction allows the protection cartridges to be replaced without removing the complete DIN-rail base.

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 while simplifying maintenance through remote monitoring.

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