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Mersen Surge Protector Type 1+2 SPD 4 Pole 277/480 Volt 20KA TNS Remote Indication
Mersen STPT12-12K320V-4PM Type 1+2 surge protection device with 12.5 kA lightning impulse current rating, 320 V UC and remote indication for 277/480 V AC three-phase plus neutral TNS systems.
This product has been discontinued
A direct replacement is available below.
Replacement product
K1-4P320-M Mersen Surge Protector Type 1+2 SPD 4 Pole 277/480 Volt 20KA TNS Remote Indication
SKU: 44120413
£296.65 ex VAT
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Why Choose the Mersen 83120147 STPT12-12K320V-4PM Surge Protection Device?
The Mersen 83120147 STPT12-12K320V-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. Built for industrial, commercial and infrastructure applications, it helps protect sensitive electrical equipment, control panels and power distribution systems from damaging surge events.
Part of the trusted Mersen Surge-Trap® STPT12 Series, this DIN rail mounted pluggable surge protection device provides combined Class I+II protection in a compact modular format. The remote indication feature allows device status to be monitored from a control system or signalling circuit, supporting easier maintenance and faster fault identification.
Designed for 277/480 V AC three-phase plus neutral (3Ph+N) electrical systems in a 4+0 TNS configuration, the STPT12-12K320V-4PM 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 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.
- Designed for 277/480 V AC three-phase plus neutral TNS systems.
- 4-pole pluggable modular design for easier servicing.
- Remote indication contact for monitoring surge protection status.
- 320 V UC maximum continuous operating voltage.
- 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.
- 277/480 V AC nominal operating voltage.
- 320 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 reduce the risk of equipment damage caused by lightning strikes, switching operations and transient overvoltage events. Installing a Type 1+2 SPD at the incoming distribution board provides a robust first line of defence for downstream electrical equipment and control systems.
The Mersen STPT12 series is designed 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.
- Telecom, IT and data centre power systems.
- Electrical control panels and switchboards.
Technical Specifications
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| Impulse Current Iimp (kA) | 12.5 kA | |
|---|---|---|
| Voltage | 480 V | |
| Phase | Three Phase | |
| Poles | 4-pole | |
| Device Type | Surge protection device | |
| SPD Type | Type 1+2 | |
| Earthing System | TN-S | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | Yes | |
| Manufacturer | Mersen | |
| Series | Surge-Trap® STPT12 | |
| Model | STPT12-12K320V-4PM | |
| Part number | 83120147 | |
| 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 | TN-S | |
| Lightning impulse current (Iimp) | 12.5 kA (10/350 μs) | |
| Maximum discharge current (Imax) | 50 kA (8/20 μs) | |
| Nominal Discharge Current (In) | 20 kA (8/20 μs) | |
| Short circuit withstand (ISCCR) | 25 kA | |
| Number of poles | 4 | |
| Number of modules | 4 | |
| Mounting type | DIN rail | |
| Format | Pluggable | |
| Remote indication | Yes | |
| Protection rating | IP20 | |
| Standards | EN 61643-11 / IEC 61643-11 | |
| RoHS compliant | Yes | |
| HS Code | 85363090 | |
| Country of Manufacture | Spain |
Frequently Asked Questions
What is the Mersen 83120147 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 83120147 is a Type 1+2 / Class I+II surge protection device designed for both lightning current discharge and transient overvoltage protection.
What electrical system is this device designed for?
It is designed for 277/480 V AC three-phase plus neutral (3Ph+N) systems using a 4+0 TNS configuration.
Does this version include remote indication?
Yes. The STPT12-12K320V-4PM includes remote indication for monitoring the status of the surge protection device.
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.
