Mersen 83020155 STPT2-40K320V-4PM Type 2 surge protection device with 40 kA maximum discharge current, 277/480 V AC operation, 320 V AC Uc, 4+0 TNS configuration, pluggable four-pole construction and remote indication.
£171.36
The Mersen 83020155 STPT2-40K320V-4PM is a high-performance Type 2 surge protection device (SPD) designed to protect low-voltage electrical installations against transient overvoltages caused by switching events and indirect lightning strikes. As part of the proven Mersen Surge-Trap® Pluggable STPT2 Series, it delivers reliable protection for commercial, industrial and infrastructure electrical systems.
Featuring a pluggable modular design, the STPT2-40K320V-4PM enables rapid replacement of protection cartridges, reducing maintenance time and minimising downtime. Integrated visual and remote indication allows continuous monitoring of the SPD status, making it ideal for critical electrical installations.
Designed for 277/480 V AC three-phase plus neutral systems, this surge protection device offers a 40 kA maximum discharge current per phase with a 4+0 TNS configuration. Its compact DIN rail mounting format allows quick installation inside electrical distribution boards and industrial control panels.
Type 2 surge protection devices are installed within electrical distribution boards to safely divert transient overvoltages away from sensitive equipment. They help reduce the risk of damage to industrial automation equipment, variable speed drives, PLCs, communication systems and power supplies.
The Mersen STPT2-40K320V-4PM combines high surge discharge capability with practical maintenance features including pluggable cartridges and remote monitoring, making it ideal for demanding industrial and commercial installations.
| Voltage | 480 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® Pluggable STPT2 Series - 40kA |
| Model | STPT2-40K320V-4PM |
| Part number | 83020155 |
| EAN / UPC | 8435297851257 |
| Product type | Type 2 surge protection device |
| SPD type | Type 2 / Class II |
| Maximum discharge current (Imax) | 40 kA |
| Nominal discharge current (In) | 20 kA |
| Waveform | 8/20 μs |
| Nominal operating voltage | 277 / 480 V AC |
| Maximum continuous operating voltage (Uc) | 320 V AC |
| Electrical system | 3-phase + neutral |
| Configuration | 4+0 TNS |
| Number of poles | 4 |
| Module width | 4 modules |
| Format | Pluggable |
| Mounting type | DIN rail |
| Remote indication | Yes |
| Protection rating | IP20 |
| Operating temperature | -40°C to +85°C |
| Dimensions (H × W × D) | approx. 90 × 72 × 70 mm |
| Weight | approx. 0.45 kg |
| Standards | IEC 61643-11, EN 61643-11, UL 1449 4th Edition |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It protects low-voltage electrical installations from transient overvoltages caused by switching operations and indirect lightning strikes.
The device is designed for 277/480 V AC three-phase plus neutral TNS systems using a 4+0 configuration.
The Mersen 83020155 provides a maximum discharge current of 40 kA per phase with a nominal discharge current of 20 kA.
Yes. The STPT2-40K320V-4PM includes both visual indication and a remote signalling contact for monitoring device status.
The surge protection device mounts directly onto a standard DIN rail inside electrical distribution boards and industrial control panels.
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, contractors and panel builders to provide dependable protection for critical power distribution systems.
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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...