Mersen STPT12-12K440V-2PM 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, remote indication and DIN rail mounting.
£187.04
The Mersen 83120125 STPT12-12K440V-2PM is a robust Type 1+2 Surge Protection Device (SPD) designed to protect low voltage electrical installations against transient overvoltages caused by lightning strikes and switching events. As part of the Mersen Surge-Trap® Pluggable STPT12 Series, it provides reliable first-stage surge protection for industrial, commercial and infrastructure applications.
This pluggable SPD combines Class I and Class II surge protection in a compact DIN rail mounted format. The replaceable cartridge design, visual indication and integrated remote signalling contact make it suitable for installations where straightforward maintenance and system monitoring are important.
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 83120125 is ideal for protecting distribution boards, control panels, automation equipment and sensitive electrical systems from damaging voltage surges.
Surge protection devices help protect electrical systems by safely limiting transient overvoltages before they reach connected equipment. This reduces the risk of damage to switchgear, control systems, drives, PLCs, instrumentation and other sensitive electrical components.
The Mersen STPT12 range is designed for use as the first level of protection in main distribution boards and incoming power supply panels. Its Type 1+2 rating makes it suitable for installations exposed to atmospheric surges and locations requiring coordinated protection against lightning currents and voltage spikes.
| Voltage | 400 V |
|---|---|
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT12 |
| Model | STPT12-12K440V-2PM |
| SKU | 83120125 |
| 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) |
| Nominal operating voltage (Un) | 400 V AC |
| Maximum continuous operating voltage (Uc) | 440 V |
| System configuration | 2+0 IT / TNS |
| Network type | 1Ph+N, 230 / 400 V AC |
| Number of poles | 2 |
| Number of modules | 2 |
| Mounting type | 35 mm DIN rail |
| Protection rating | IP20 |
| Remote indication | Yes |
| Format | Pluggable |
| Dimensions (W × H × D) | approx. 42 × 90 × 117 mm |
| Weight | approx. 0.382 kg |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It is used to protect low voltage electrical installations from transient overvoltages caused by lightning and switching events.
The Mersen 83120125 provides combined Type 1+2 / Class I+II surge protection.
Yes. The device includes remote indication, allowing the surge protection status to be monitored externally.
The Mersen 83120125 has a 440 V maximum continuous operating voltage.
It is typically installed on a DIN rail inside main distribution boards, incoming panels or electrical switchboards.
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and industrial facilities worldwide for dependable protection of electrical distribution systems and sensitive connected 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...