Why Choose the Mersen 44020405 K2-4P275-M Surge Protection Device?
The Mersen 44020405, also known as the K2-4P275-M, is a high-performance Type 2 surge protection device (SPD) designed to protect low-voltage electrical installations against transient overvoltages caused by induced lightning surges and electrical switching events. Part of the Mersen Surge-Trap® K2 Series, this four-pole, pluggable device provides dependable surge protection for three-phase TNS power distribution systems.
Featuring a 4+0 internal configuration, the K2-4P275-M provides L-PE and N-PE protection across four poles. It has a nominal discharge current of 20 kA and a maximum discharge current of 50 kA, helping protect industrial machinery, automation equipment, control panels and sensitive electronic systems from damaging voltage transients.
The Mersen 44020405 is designed for 230/400 V AC networks and has a maximum continuous operating voltage of 275 V AC. Its integrated microswitch provides remote status indication, allowing the condition of the SPD to be monitored through a PLC, alarm circuit, SCADA platform or building management system. Pluggable protection cartridges and DIN rail mounting also simplify installation and maintenance.
Key Advantages
- Reliable Type 2 surge protection for three-phase TNS installations.
- 50 kA maximum discharge current for effective transient overvoltage protection.
- 20 kA nominal discharge current using an 8/20 µs waveform.
- Four-pole 4+0 configuration for comprehensive conductor protection.
- Integrated remote indication microswitch supports external status monitoring.
- Pluggable protection cartridges simplify inspection and replacement.
- Visual status indication provides clear end-of-life monitoring.
- Compact DIN rail design enables straightforward panel installation.
Key Features
- Mersen Surge-Trap® K2 Series.
- Type 2 / IEC Class II surge protection device.
- UL Type 1 Component Assembly.
- Four-pole 4+0 internal configuration.
- 230/400 V AC nominal operating voltage.
- 275 V AC maximum continuous operating voltage.
- 20 kA nominal discharge current.
- 50 kA maximum discharge current.
- ≤1.5 kV voltage protection level at nominal discharge current.
- Integrated visual and remote status indication.
- Dynamic thermal disconnection with open-circuit failure mode.
- Pluggable modules with DIN rail mounting.
Surge Protection with Remote Status Monitoring
Transient overvoltages can be generated by indirect lightning activity, utility network disturbances and the switching of motors, transformers or other inductive loads. These short-duration voltage spikes may damage control equipment, power supplies, variable speed drives and other sensitive electrical devices.
The Mersen K2-4P275-M safely diverts surge current away from connected equipment while its integrated microswitch provides a remote indication of device condition. Maintenance teams can connect this contact to an alarm, PLC or building management system, allowing deterioration or end-of-life status to be identified without manually inspecting the distribution board.
Typical Applications
- Industrial electrical distribution boards.
- Commercial switchboards and building services.
- Motor control centres and machinery panels.
- PLC and industrial automation systems.
- Manufacturing and process-control equipment.
- HVAC and facilities-management systems.
- Remote monitoring and alarm installations.
- Three-phase 230/400 V AC TNS networks.
