Why Choose the Mersen 44120305 K1-3P320-M Surge Protection Device?
The Mersen 44120305 K1-3P320-M is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect three-phase low-voltage electrical installations against lightning currents and transient overvoltages. As part of the established Mersen Surge-Trap® K - K1 Series, this pluggable surge protector provides first-level protection for industrial, commercial and infrastructure power distribution systems.
Designed for installation within a main distribution board, the K1-3P320-M combines substantial surge-handling capability with a compact DIN rail mounted format. Its replaceable pluggable modules simplify maintenance, while the integrated microswitch enables remote monitoring of the device condition from a control panel, building management system or other signalling circuit.
With a 320 V AC maximum continuous operating voltage (Uc), a 3+0 protection configuration and a 12.5 kA lightning impulse current per pole, the K1-3P320-M is suitable for three-phase TNC systems with a nominal operating voltage of 277/480 V AC. Its visual condition indicators and remote signalling contact help maintenance teams identify when replacement is required.
Key Advantages
- Combined Type 1+2 protection against lightning currents and induced voltage surges.
- Integrated remote signalling microswitch for convenient condition monitoring.
- Pluggable modular construction simplifies maintenance and cartridge replacement.
- Suitable for 277/480 V AC three-phase TNC systems.
- Compact DIN rail design supports space-efficient panel installation.
- Helps protect switchgear, drives, controls and other sensitive electrical equipment.
Key Features
- Mersen Surge-Trap® K - K1 Series.
- IEC Class I+II / Type 1+2 surge protection device.
- 320 V AC maximum continuous operating voltage.
- 12.5 kA lightning impulse current (Iimp).
- 20 kA nominal discharge current (In).
- 50 kA maximum discharge current (Imax).
- Three-pole 3+0 protection configuration.
- Visual Green (OK) / Not Green (Replace) status indication.
- Integrated remote indication microswitch.
- Pluggable DIN rail mounted format.
Reliable Protection Against Electrical Surges
The Mersen K1-3P320-M diverts high-energy surge currents away from connected equipment before damaging overvoltages can reach critical components. This helps reduce the risk of failures in switchgear, motor drives, automation controls, power supplies and other sensitive electrical systems.
Its combined lightning-current and surge protection, remote monitoring capability and replaceable modules make it particularly suitable for installations where system availability and straightforward preventative maintenance are important.
Typical Applications
- Main three-phase electrical distribution boards.
- Industrial automation and control panels.
- Manufacturing and processing facilities.
- Commercial and institutional buildings.
- Data centres and telecommunications facilities.
- Water and wastewater treatment installations.
- Infrastructure and utility systems.
- 277/480 V AC three-phase TNC power networks.
