Mersen STPT12-12K440V-2P Type 1+2 pluggable surge protection device with 12.5 kA lightning impulse current, 440 V maximum continuous operating voltage, 2 pole 2+0 IT/TNS configuration and DIN rail mounting.
£168.51
The Mersen 83120124 STPT12-12K440V-2P is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect low voltage electrical installations against transient overvoltages caused by lightning activity and electrical switching events. As part of the Mersen Surge-Trap® Pluggable STPT12 Series, it provides dependable first-stage surge protection for industrial, commercial and infrastructure power distribution systems.
This compact pluggable SPD combines Class I and Class II surge protection in one DIN rail mounted device, making it suitable for incoming power supply panels and installations exposed to atmospheric surges. Its replaceable cartridge format and clear status indication help simplify inspection, maintenance and replacement when required.
With a 12.5 kA lightning impulse current rating, 440 V maximum continuous operating voltage and 2-pole 2+0 IT/TNS configuration, the Mersen 83120124 is ideal for protecting electrical equipment, distribution boards, control panels and sensitive industrial systems from damaging voltage surges.
Surge protection devices help protect electrical installations by safely diverting transient overvoltages before they reach connected equipment. This reduces the risk of damage to control systems, switchgear, drives, automation hardware and other sensitive electrical components.
The Mersen STPT12 range is designed for use as the first level of surge protection in installations where lightning exposure and switching surges may occur. Its Type 1+2 classification makes it suitable for incoming distribution panels and applications requiring coordinated surge protection.
| Voltage | 400 V |
|---|---|
| Phase | Single Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT12 |
| Model | STPT12-12K440V-2P |
| SKU | 83120124 |
| Product type | Type 1+2 Surge Protection Device |
| IEC classification | Class I+II |
| Lightning impulse current (Iimp) | 12.5 kA (10/350 μs) |
| Maximum discharge current (Imax) | 50 kA (8/20 μs) |
| Maximum continuous operating voltage (Uc) | 440 V |
| Nominal operating voltage | 400 V AC |
| System configuration | 2+0 IT / TNS |
| Number of poles | 2 |
| Number of modules | 2 |
| Mounting type | 35 mm DIN rail |
| Protection rating | IP20 |
| Format | Pluggable |
| Dimensions (W × H × D) | approx. 41 × 90 × 117 mm |
| Weight | approx. 0.345 kg |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It is used to protect low voltage electrical installations against transient overvoltages caused by lightning and switching events.
The Mersen 83120124 provides combined Type 1+2 / Class I+II surge protection.
The device has a 440 V maximum continuous operating voltage.
Yes. It uses a pluggable cartridge design, allowing the protection module to be replaced quickly when required.
It is typically installed on a DIN rail inside incoming distribution boards, switchboards or main electrical panels.
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and industrial facilities worldwide for reliable protection of power distribution systems and sensitive electrical equipment.
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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...