Why Choose the Mersen 44020304 K2-3P320 Surge Protection Device?
The Mersen 44020304, also identified as the K2-3P320, 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 and TN-C-S systems, helping safeguard electrical equipment from lightning-induced surges and switching transients.
Its pluggable three-pole construction allows individual protection cartridges to be inspected or replaced without removing the complete DIN-rail base. A clear visual status indicator provides quick confirmation of the operating condition, helping maintenance teams identify when a cartridge requires replacement.
Featuring a 320 V AC maximum continuous operating voltage, a 20 kA nominal discharge current and a 50 kA maximum discharge current, the Mersen 44020304 provides dependable secondary surge protection for industrial switchgear, commercial distribution boards, motor control centres and automation panels.
Key Advantages
- Reliable Type 2 surge protection for three-phase low-voltage systems.
- 50 kA maximum discharge current for robust transient overvoltage protection.
- Suitable for 277/480 V TN-C and TN-C-S networks.
- Pluggable protection cartridges simplify inspection and replacement.
- Visual status indication enables rapid condition checks.
- Compact three-module DIN-rail format 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 V AC nominal line-to-earth voltage.
- 480 V AC nominal system 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).
- Thermal disconnection and visual condition indication.
- Replaceable plug-in cartridges.
Dependable Protection for Three-Phase 480 V Systems
Transient overvoltages can be introduced by indirect lightning strikes, utility switching operations, contactors, motors, transformers and other inductive loads. Although these events usually last only a fraction of a second, they can damage PLCs, variable speed drives, power supplies, communication equipment and other sensitive electrical components.
The Mersen K2-3P320 diverts excessive surge energy away from connected equipment and towards earth. Its high discharge capacity, fast-response protection technology and replaceable cartridges help improve system reliability while simplifying ongoing maintenance.
Typical Applications
- 277/480 V three-phase distribution boards.
- TN-C and TN-C-S electrical installations.
- Industrial switchgear assemblies.
- Motor control centres.
- PLC and automation control panels.
- Commercial and industrial power distribution systems.
