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Mersen Surge Protector Type 1+2 SPD 2 Pole 277 Volt 20KA TNS Remote Indication
Mersen STPT12-12K320V-2PM Type 1+2 pluggable surge protection device with 12.5 kA lightning impulse current, 277 V AC nominal voltage, remote indication and DIN rail mounting.
This product has been discontinued
A direct replacement is available below.
Replacement product
K1-2P320-M Mersen Surge Protector Type 1+2 SPD 2 Pole 277 Volt 20KA TNS Remote Indication
SKU: 44120213
£148.53 ex VAT
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Why Choose the Mersen 83120123 Surge Protection Device?
The Mersen 83120123 STPT12-12K320V-2PM is a high-performance Type 1+2 Surge Protection Device (SPD) engineered to protect low voltage electrical installations against transient overvoltages caused by lightning strikes and switching events. As part of the trusted Mersen Surge-Trap® Pluggable STPT12 Series, it provides reliable protection for industrial, commercial and critical infrastructure applications.
Designed for installation within main distribution boards, this pluggable surge protection device combines Class I and Class II protection into a compact DIN rail mounted solution. Its replaceable protection module, visual status indication and remote signalling contact simplify maintenance while helping maximise system uptime.
Supporting a 277 V AC nominal system voltage with a 12.5 kA lightning impulse current (10/350 μs), the Mersen 83120123 provides dependable protection for sensitive electrical equipment, automation systems and distribution networks exposed to atmospheric or switching surges.
Key Advantages
- Combined Type 1+2 surge protection for comprehensive installation protection.
- 12.5 kA lightning impulse current (Iimp) capability per IEC standards.
- Pluggable cartridge design for fast and simple maintenance.
- Integrated remote signalling contact for system monitoring.
- Compact DIN rail mounting with only 2 module width.
- Suitable for industrial, commercial and infrastructure installations.
Key Features
- Mersen Surge-Trap® Pluggable STPT12 Series.
- Type 1+2 / Class I+II surge protection device.
- 12.5 kA Iimp (10/350 μs).
- 50 kA maximum discharge current (Imax 8/20 μs).
- 20 kA nominal discharge current (In).
- 277 V AC nominal operating voltage.
- 2-pole, 2+0 TNS configuration.
- Pluggable protection module with remote indication.
- DIN rail mounted IP20 enclosure.
Reliable Protection Against Electrical Surges
Surge protection devices protect electrical systems from damaging transient overvoltages caused by lightning activity and switching operations. By limiting surge energy before it reaches connected equipment, they help reduce downtime, extend equipment life and improve overall installation reliability.
The Mersen Surge-Trap® STPT12 Series is designed for demanding industrial and commercial environments where dependable surge protection is essential for automation equipment, switchboards, power distribution systems and critical infrastructure.
Typical Applications
- Main low voltage distribution boards.
- Industrial automation and manufacturing plants.
- Commercial buildings.
- Water treatment facilities.
- Telecommunications and data centres.
- Renewable energy and photovoltaic installations.
Technical Specifications
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| Impulse Current Iimp (kA) | 12.5 kA | |
|---|---|---|
| Voltage | 277 V | |
| Phase | Single Phase | |
| Poles | 2-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® Pluggable STPT12 | |
| Model | STPT12-12K320V-2PM | |
| SKU | 83120123 | |
| 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 Discharge Current (In) | 20 kA (8/20 μs) | |
| Nominal operating voltage (Un) | 277 V AC | |
| Maximum continuous operating voltage (Uc) | 320 V | |
| System configuration | TN-S | |
| Number of poles | 2 | |
| Mounting type | 35 mm DIN rail | |
| Protection rating | IP20 | |
| Remote indication | Yes | |
| Format | Pluggable | |
| HS Code | 85363090 | |
| Country of Manufacture | Spain |
Frequently Asked Questions
What is the Mersen 83120123 used for?
It protects low voltage electrical installations against lightning induced surges and transient overvoltages.
What type of surge protection does it provide?
The device provides combined Type 1+2 (Class I+II) surge protection in accordance with IEC standards.
Is the protection module replaceable?
Yes. The pluggable cartridge design allows the protection module to be replaced quickly without removing the complete base.
Does the device support remote monitoring?
Yes. It includes an integrated remote signalling contact in addition to visual status indication.
Where is this surge protection device typically installed?
It is normally installed on a DIN rail inside the main electrical distribution board to provide primary surge protection for the installation.
Trusted for Critical Power Protection
Mersen Surge-Trap® surge protection devices are trusted worldwide by electrical engineers, panel builders and industrial facilities for reliable protection of power distribution systems and sensitive electrical equipment.
