Mersen STPT12-12K320V-4P Type 1+2 surge protection device with 12.5 kA lightning impulse current rating and 320 V UC for 277/480 V AC three-phase plus neutral TNS systems.
Original price was: £326.23.£260.99Current price is: £260.99.
The Mersen 83120146 STPT12-12K320V-4P is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect low-voltage electrical installations from lightning currents and transient overvoltages. Developed for industrial, commercial and infrastructure environments, it helps protect distribution systems, control panels and sensitive electrical equipment from damaging surge events.
Part of the trusted Mersen Surge-Trap® STPT12 Series, this pluggable DIN rail mounted surge protection device combines lightning current discharge capability with transient overvoltage protection in a compact modular design. It is suitable as a first stage of protection in main distribution boards and incoming power supply panels.
Designed for 277/480 V AC three-phase plus neutral (3Ph+N) electrical systems in a 4+0 TNS configuration, the STPT12-12K320V-4P provides a 12.5 kA Iimp (10/350 μs) lightning impulse current rating per pole. Its 320 V UC maximum continuous operating voltage makes it suitable for higher voltage three-phase installations requiring dependable surge protection.
Surge protection devices help reduce the risk of equipment damage caused by lightning strikes, utility switching and transient overvoltage events. Installing a Type 1+2 SPD at the main distribution board provides a robust first line of defence for the wider electrical installation.
The Mersen STPT12 series is engineered for demanding electrical environments, offering dependable surge protection for switchboards, automation systems, industrial machinery and building services where operational continuity is essential.
| Voltage | 480 V |
|---|---|
| Phase | Three Phase |
| Manufacturer | Mersen |
| Series | Surge-Trap® STPT12 |
| Model | STPT12-12K320V-4P |
| Part number | 83120146 |
| Product type | Type 1+2 Surge Protection Device |
| IEC classification | Class I+II |
| Nominal operating voltage (Un) | 277/480 V AC |
| Maximum continuous operating voltage (Uc) | 320 V AC |
| System configuration | 3Ph+N, 4+0 TNS |
| Lightning impulse current (Iimp) | 12.5 kA (10/350 μs) |
| Number of poles | 4 |
| Number of modules | 4 |
| Mounting type | DIN rail |
| Format | Pluggable |
| Standards | EN 61643-11 / IEC 61643-11 |
| RoHS compliant | Yes |
| HS Code | 85363090 |
| Country of Manufacture | Spain |
It is used to protect low-voltage electrical installations against lightning currents and transient overvoltages.
The 83120146 is a Type 1+2 / Class I+II surge protection device designed for lightning current discharge and transient overvoltage protection.
It is designed for 277/480 V AC three-phase plus neutral (3Ph+N) systems using a 4+0 TNS configuration.
The 320 V UC rating refers to the maximum continuous operating voltage that the surge protection device can withstand during normal operation.
It is typically installed in the main incoming distribution board as the first stage of surge protection for the electrical installation.
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and industrial facilities worldwide to provide dependable protection against lightning currents, switching surges and transient overvoltages.
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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...