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.
