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Mersen Surge Protector Type 1+2 SPD 4 Pole 230/400:400/690 Volt 20KA IT
Mersen STPT12-12K440V-4PM Type 1+2 surge protection device with 12.5 kA lightning impulse current rating, 440 V UC and remote indication for 230/400 V AC and 400/690 V AC three-phase plus neutral systems.
£280.16
Why Choose the Mersen 83120149 STPT12-12K440V-4PM Surge Protection Device?
The Mersen 83120149 STPT12-12K440V-4PM 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 format. The remote indication feature enables device status to be monitored externally, supporting easier maintenance and faster fault identification.
Designed for 230/400 V AC and 400/690 V AC three-phase plus neutral (3Ph+N) systems, the STPT12-12K440V-4PM provides a 12.5 kA Iimp (10/350 μs) lightning impulse current rating. Its 440 V UC maximum continuous operating voltage makes it suitable for higher voltage installations requiring dependable first-stage surge protection.
Key Advantages
- Combined Type 1+2 surge protection for lightning currents and transient overvoltages.
- 12.5 kA Iimp (10/350 μs) lightning impulse current capability.
- Suitable for 230/400 V AC and 400/690 V AC three-phase systems.
- 440 V UC maximum continuous operating voltage.
- 4-pole pluggable modular design for easier servicing.
- Remote indication contact for monitoring surge protection status.
- DIN rail mounting for quick installation in electrical distribution panels.
Key Features
- Mersen Surge-Trap® STPT12 Series.
- Type 1+2 / Class I+II surge protection device.
- 12.5 kA Iimp (10/350 μs) lightning impulse current.
- 50 kA Imax (8/20 μs) maximum discharge current.
- 20 kA In (8/20 μs) nominal discharge current.
- 400/690 V AC nominal operating voltage.
- 440 V UC maximum continuous operating voltage.
- 4-pole, 4-module pluggable format with remote indication.
Reliable Protection Against Lightning and Voltage Surges
Surge protection devices help reduce the risk of equipment damage caused by lightning strikes, switching operations and transient overvoltage events. Installing a Type 1+2 SPD at the main distribution board provides a robust first line of defence for downstream electrical equipment and control systems.
The Mersen STPT12 series is engineered for demanding electrical environments, offering dependable surge protection for switchboards, automation systems, industrial machinery, commercial facilities and infrastructure installations where operational continuity is essential.
Typical Applications
- Main electrical distribution boards.
- Industrial automation systems.
- Commercial building electrical installations.
- Manufacturing facilities.
- Infrastructure and utility installations.
- Electrical control panels and switchboards.
- Higher voltage three-phase distribution systems.
Technical Specifications
Tick the specs you need, then view products that match.
| Impulse Current Iimp (kA) | 12.5 kA | |
|---|---|---|
| Voltage | 690 V | |
| Phase | Three Phase | |
| Poles | 4-pole | |
| Device Type | Surge protection device | |
| SPD Type | Type 1+2 | |
| Earthing System | IT, TN-S | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | Yes | |
| Manufacturer | Mersen | |
| Series | Surge-Trap® STPT12 | |
| Model | STPT12-12K440V-4PM | |
| Part number | 83120149 | |
| Product type | Type 1+2 Surge Protection Device | |
| IEC classification | Class I+II | |
| Nominal operating voltage (Un) | 400/690 V AC | |
| Maximum continuous operating voltage (Uc) | 440 V AC | |
| System configuration | TN-S (also suitable for 230/400 V IT) | |
| Protection modes | L-PE / N-PE | |
| Lightning impulse current (Iimp) | 12.5 kA (10/350 μs) | |
| Maximum discharge current (Imax) | 50 kA (8/20 μs) | |
| Number of poles | 4 | |
| Number of modules | 4 | |
| Mounting type | DIN rail | |
| Format | Pluggable | |
| Remote indication | Yes | |
| Standards | EN 61643-11 / IEC 61643-11 | |
| RoHS compliant | Yes | |
| HS Code | 85363090 | |
| Country of Manufacture | Spain |
Frequently Asked Questions
What is the Mersen 83120149 used for?
It is used to protect low-voltage electrical installations against lightning currents and transient overvoltages.
What type of surge protection device is this?
The 83120149 is a Type 1+2 / Class I+II surge protection device designed for lightning current discharge and transient overvoltage protection.
What electrical system is this device designed for?
It is designed for 230/400 V AC and 400/690 V AC three-phase plus neutral installations using 4+0 IT or TNS configurations.
Does this version include remote indication?
Yes. The STPT12-12K440V-4PM includes remote indication for external monitoring of the surge protection device status.
Where should this SPD be installed?
It is typically installed in the main incoming distribution board as the first stage of surge protection for the electrical installation.
Trusted for Industrial Electrical Protection
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.
