Mersen 83120004 SP12-12K440V Type 1+2 surge protection replacement cartridge with 12.5 kA impulse current rating, 20 kA nominal discharge current and 440 V maximum continuous operating voltage.
£72.10
The Mersen 83120004, also known as SP12-12K440V, is a high-performance Type 1+2 surge protection replacement cartridge designed for use with Mersen Surge-Trap pluggable surge protection devices. It provides dependable protection against lightning currents and transient overvoltages in electrical distribution systems.
As part of the Mersen STP T12 12.5 Surge-Trap series, this replaceable cartridge is engineered for installations requiring coordinated surge protection at the incoming power supply. Its plug-in design allows quick replacement during maintenance, helping reduce downtime while maintaining reliable protection for connected equipment.
With a 12.5 kA impulse current rating, 20 kA nominal discharge current and 440 V maximum continuous operating voltage, the Mersen 83120004 is suitable for demanding industrial, commercial and power distribution applications where Type 1+2 surge protection is required.
Surge protection devices help protect electrical installations from transient overvoltages caused by lightning activity, switching operations and network disturbances. A Type 1+2 SPD is commonly used near the origin of an installation to discharge high-energy surge currents before they can damage sensitive downstream equipment.
The Mersen 83120004 replacement cartridge enables continued protection without replacing the complete surge protection assembly. This makes it a practical choice for maintenance teams, panel builders and electrical contractors responsible for keeping distribution systems protected and operational.
| Voltage | 440 V |
|---|---|
| Phase | Single Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap STP T12 12.5 |
| Model | SP12-12K440V |
| Manufacturer part number | 83120004 |
| Product type | Surge protection replacement cartridge |
| Surge protection type | Type 1+2 / Class I+II |
| Number of poles | 1 pole |
| Maximum continuous operating voltage | 440 V AC |
| Nominal voltage | 400 V AC |
| Impulse current | 12.5 kA |
| Nominal discharge current | 20 kA |
| Maximum discharge current | 50 kA |
| Protection rating | IP20 |
| Format | Plug-in replaceable cartridge |
The Mersen 83120004 is a replacement cartridge for compatible Mersen Type 1+2 Surge-Trap surge protection devices used in electrical distribution systems.
The alternative product code for Mersen 83120004 is SP12-12K440V.
This cartridge has a 440 V AC maximum continuous operating voltage and is commonly associated with 400 V electrical systems.
The Mersen 83120004 is a Type 1+2 / Class I+II surge protection replacement cartridge.
It is typically used in incoming power supply panels, distribution boards and surge protection assemblies where coordinated lightning and surge protection is required.
Mersen Surge-Trap devices are widely used by panel builders, electrical contractors and maintenance engineers to protect power distribution systems from damaging transient overvoltages and lightning-related surge events.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...