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Mersen Surge Protector Type 1+2 SPD 4 Pole 120/208 Volt 20KA TT Remote Indication
Mersen STPT12-12K150V-4PGM Type 1+2 pluggable surge protection device with 12.5 kA lightning impulse current, 150 V maximum continuous operating voltage, 120/208 V AC nominal voltage, 4 pole 3+1 TT configuration, remote indication and DIN rail mounting.
£302.81
Why Choose the Mersen 83120137 Surge Protection Device?
The Mersen 83120137 STPT12-12K150V-4PGM is a high-performance Type 1+2 Surge Protection Device (SPD) designed to protect low voltage electrical installations against transient overvoltages caused by lightning activity and switching events. As part of the Mersen Surge-Trap® Pluggable STPT12 Series, it provides reliable first-stage surge protection for three-phase plus neutral power distribution systems.
This pluggable SPD combines Class I and Class II surge protection in a compact DIN rail mounted format. Its 3+1 TT configuration provides coordinated protection between live conductors and neutral, with additional protection between neutral and earth, making it suitable for incoming supply panels and installations exposed to atmospheric surges.
With a 12.5 kA lightning impulse current rating, 120/208 V nominal operating voltage, 150 V maximum continuous operating voltage and integrated remote indication, the Mersen 83120137 is ideal for protecting three-phase TT distribution systems, control panels, switchboards and sensitive electrical equipment from damaging voltage surges.
Key Advantages
- Combined Type 1+2 surge protection for low voltage installations.
- 12.5 kA lightning impulse current (Iimp) for robust surge handling.
- 150 V maximum continuous operating voltage for 120/208 V systems.
- 3+1 TT configuration for three-phase plus neutral networks.
- Integrated remote indication for external SPD status monitoring.
- Compact 4-pole, 4-module DIN rail format.
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 8/20 μs).
- 120/208 V nominal operating voltage.
- 150 V maximum continuous operating voltage.
- 4-pole configuration for 3+1 TT systems.
- Remote signalling contact for status monitoring.
- DIN rail mounted IP20 construction.
Reliable Protection Against Electrical Surges
Surge protection devices help protect electrical systems by safely limiting transient overvoltages before they reach connected equipment. This reduces the risk of damage to switchgear, control systems, drives, PLCs, instrumentation, power supplies and other sensitive electrical components.
The Mersen STPT12 range is designed for use as the first level of protection in main distribution boards and incoming supply panels. Its Type 1+2 classification makes it suitable for installations exposed to atmospheric surges and applications requiring coordinated protection against lightning currents and voltage spikes.
Typical Applications
- Main low voltage distribution boards.
- Incoming power supply panels.
- Three-phase plus neutral TT electrical systems.
- Industrial automation and control panels.
- Commercial building electrical installations.
- Switchboards, panel building and infrastructure systems.
Technical Specifications
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| Impulse Current Iimp (kA) | 12.5 kA | |
|---|---|---|
| Voltage | 208 V | |
| Phase | Three Phase | |
| Poles | 4-pole | |
| Device Type | Surge protection device | |
| SPD Type | Type 1+2 | |
| Earthing System | TN-S, TT | |
| Nominal Discharge Current (In) | 20 kA | |
| Remote Signal | Yes | |
| Manufacturer | Mersen | |
| Series | Surge-Trap® Pluggable STPT12 | |
| Model | STPT12-12K150V-4PGM | |
| SKU | 83120137 | |
| 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) | 120/208 V AC | |
| Maximum continuous operating voltage (Uc) | 150 V | |
| System configuration | TN-S, TT | |
| Network type | TN-S, TT | |
| Protection modes | L-N / N-PE | |
| Number of poles | 4 | |
| Number of modules | 4 | |
| Mounting type | 35 mm DIN rail | |
| Protection rating | IP20 | |
| Remote indication | Yes | |
| Format | Pluggable | |
| Dimensions (W × H × D) | approx. 78 × 90 × 117 mm | |
| Weight | approx. 0.56 kg | |
| EAN / UPC code | 8435297851516 | |
| HS Code | 85363090 | |
| Country of Manufacture | Spain |
Frequently Asked Questions
What is the Mersen 83120137 used for?
It is used to protect low voltage electrical installations against transient overvoltages caused by lightning activity and switching events.
What type of surge protection does this device provide?
The Mersen 83120137 provides combined Type 1+2 / Class I+II surge protection.
Does this SPD include remote indication?
Yes. The device includes remote indication, allowing the surge protection status to be monitored externally.
What electrical system is this SPD designed for?
It is designed for 3 phase plus neutral, 3+1 TT systems operating at 120/208 V AC.
Where is this surge protection device typically installed?
It is typically installed on a DIN rail inside main distribution boards, incoming panels or electrical switchboards.
Trusted for Critical Power Protection
Mersen Surge-Trap® surge protection devices are trusted by electrical engineers, panel builders and industrial facilities worldwide for dependable protection of power distribution systems and sensitive connected equipment.
