Why Choose the Mersen 44020305 K2-3P320-M Surge Protection Device?
The Mersen 44020305, also identified as the K2-3P320-M, 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 is suitable for 277/480 V TN-C electrical systems and incorporates an integrated remote signalling contact for continuous condition monitoring.
The K2-3P320-M uses a compact pluggable construction, allowing the protection cartridges to be inspected or replaced without removing the complete DIN-rail base. A clear visual status indicator provides local confirmation of the device condition, while the integrated microswitch enables remote monitoring through PLCs, SCADA platforms, alarm circuits and building management systems.
Featuring a 320 V AC maximum continuous operating voltage, a 20 kA nominal discharge current and a 50 kA maximum discharge current, the Mersen 44020305 provides dependable protection against lightning-induced surges and switching transients. Its three-pole design is ideal for industrial switchgear, commercial distribution boards, motor control centres and automation installations where remote indication is required.
Key Advantages
- Reliable Type 2 surge protection for three-phase 277/480 V systems.
- Integrated remote signalling microswitch for continuous status monitoring.
- 50 kA maximum discharge current for robust transient protection.
- Pluggable protection cartridges simplify inspection and replacement.
- Visual condition indicator enables rapid local status checks.
- Compact three-module DIN-rail construction saves enclosure space.
Key Features
- Mersen Surge-Trap K2 series.
- Type 2 / Class II surge protection device.
- Three-pole design.
- 3+0 protection configuration.
- 277/480 V AC nominal operating voltage.
- 320 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 protection cartridges.
Three-Phase Surge Protection with Remote Monitoring
Transient overvoltages produced by indirect lightning strikes, utility switching, motors, transformers and other inductive loads can damage PLCs, variable speed drives, communication equipment and power supplies. Although these voltage spikes are extremely brief, they can cause immediate equipment failure or gradually degrade sensitive electronic components.
The Mersen K2-3P320-M diverts excessive surge energy towards earth before it reaches connected equipment. Its integrated remote contact allows maintenance teams to monitor the protection status from a central control system, while the pluggable cartridges provide fast replacement when servicing becomes necessary.
Typical Applications
- 277/480 V TN-C distribution boards.
- Industrial switchgear assemblies.
- Motor control centres.
- PLC and automation control panels.
- SCADA and building management systems.
- Commercial and industrial power distribution installations.
