Why Choose the Mersen 44020309 K2-3P440-M Surge Protection Device?
The Mersen 44020309, also identified as the K2-3P440-M, is a premium Type 2 surge protection device (SPD) engineered to protect three-phase low-voltage electrical installations against transient overvoltages. Part of the trusted Mersen Surge-Trap K2 series, it is designed for 400/690 V TN-C electrical systems and is also suitable for 400 V IT network configurations. An integrated remote signalling contact enables continuous monitoring of the protection status from a central control system.
Its pluggable construction allows the protection cartridges to be replaced quickly without removing the complete DIN-rail base, reducing maintenance time and minimising downtime. A visual status indicator provides immediate local confirmation of the device condition, while the built-in microswitch transmits the operational status to PLCs, SCADA systems or building management systems.
With a 440 V AC maximum continuous operating voltage, 20 kA nominal discharge current and 50 kA maximum discharge current, the Mersen K2-3P440-M provides dependable protection against lightning-induced surges and switching transients in demanding commercial and industrial installations.
Key Advantages
- Reliable Type 2 surge protection for three-phase 400/690 V electrical systems.
- Integrated remote signalling microswitch for continuous condition monitoring.
- 50 kA maximum discharge current for excellent transient overvoltage protection.
- Suitable for TN-C systems and compatible with 400 V IT networks.
- Replaceable plug-in cartridges simplify maintenance.
- Visual operating status indication enables rapid inspection.
Key Features
- Mersen Surge-Trap K2 series.
- Type 2 / Class II surge protection device.
- Three-pole (3+0) configuration.
- 400/690 V AC nominal operating voltage.
- 440 V AC maximum continuous operating voltage (Uc).
- 20 kA nominal discharge current (In).
- 50 kA maximum discharge current (Imax).
- Protection mode: L-PE(N).
- Integrated visual indication and remote signalling microswitch.
- Dynamic thermal disconnection technology.
- Replaceable plug-in cartridges.
- Compact DIN-rail mounting.
Three-Phase Surge Protection with Remote Monitoring
Transient overvoltages generated by indirect lightning strikes, utility switching operations, motors, transformers and other inductive loads can damage PLCs, drives, communication equipment, power supplies and sensitive control electronics. A dedicated Type 2 SPD helps prevent costly equipment failures, minimise downtime and improve long-term electrical reliability.
The Mersen K2-3P440-M combines high surge current capability with integrated remote signalling, allowing maintenance personnel to monitor protection status remotely while benefiting from fast replacement of the plug-in protection cartridges whenever servicing is required.
Typical Applications
- 400/690 V TN-C distribution boards.
- 400 V IT electrical installations.
- Industrial switchgear assemblies.
- Motor control centres.
- PLC and automation systems.
- Commercial and industrial power distribution.
- SCADA and building management systems.
