Why Choose the Mersen 83120121 Surge Protection Device?

The Mersen 83120121 STPT12-12K275V-2PM is a dependable Type 1+2 surge protection device (SPD) designed to protect low-voltage electrical installations against lightning currents and transient overvoltages. Part of the Mersen Surge-Trap® Pluggable STPT12 Series, it is suitable for main distribution boards, incoming supply panels and installations requiring reliable first-level surge protection.

This device provides protection for single-phase plus neutral systems, using a 2+0 TNS configuration. Its pluggable format allows quick replacement of protection modules, while integrated remote indication supports convenient monitoring from a panel indicator or control system.

With a 12.5 kA lightning impulse current (10/350 μs), 230 V nominal operating voltage (Un) and 275 V maximum continuous operating voltage (Uc), the 83120121 provides robust surge protection for commercial, industrial and infrastructure electrical systems.

Key Advantages

• Type 1+2 surge protection device for lightning current and transient overvoltage protection.
• 12.5 kA Iimp (10/350 μs) lightning impulse current rating.
• 1Ph+N 2+0 TNS configuration for single-phase plus neutral systems.
• 230 V nominal operating voltage with 275 V maximum continuous operating voltage.
• Compact 2-pole pluggable design for DIN rail installation.
• Integrated remote indication for device status monitoring.

Key Features

• Mersen Surge-Trap® STPT12 Series.
• Catalogue number: 83120121.
• Model: STPT12-12K275V-2PM.
• IEC Type 1+2 / Class I+II surge protection.
• 230 V AC nominal operating voltage (Un).
• 275 V AC maximum continuous operating voltage (Uc).
• 2-pole, 2-module pluggable format.
• Remote indication for monitoring.
• DIN rail mounting.
• Designed for 2+0 TNS single-phase plus neutral configurations.

Technical Specifications

• Manufacturer: Mersen
• Series: Surge-Trap® Pluggable STPT12
• Model: STPT12-12K275V-2PM
• Part number: 83120121
• Product type: Type 1+2 Surge Protection Device
• IEC classification: Class I+II
• Lightning impulse current (Iimp 10/350 μs): 12.5 kA
• Nominal discharge current (In 8/20 μs): 20 kA
• Nominal operating voltage (Un): 230 V AC
• Maximum continuous operating voltage (Uc): 275 V AC
• Protection modes: L-N
• System configuration: 1Ph+N, 2+0 TNS
• Number of poles: 2
• Module width: 2 modules
• Mounting type: DIN rail
• Remote indication: Yes
• Format: Pluggable

Reliable Protection Against Transient Overvoltages

Surge protection devices help protect electrical equipment from damaging voltage spikes caused by lightning activity, switching operations and disturbances on the power network. Installing a Type 1+2 SPD at the incoming supply point helps reduce the risk of equipment damage, downtime and disruption to critical electrical systems.

The Mersen STPT12 Series is engineered for low-voltage distribution applications where reliable surge protection, compact installation and straightforward maintenance are required. The pluggable format allows protection modules to be replaced quickly without rewiring the complete assembly.

Typical Applications

• Main electrical distribution boards.
• Incoming power supply panels.
• Single-phase plus neutral electrical systems.
• Commercial building installations.
• Industrial control panels.
• Infrastructure and critical power systems.

Trusted Protection for Critical Electrical Systems

Mersen Surge-Trap® surge protection devices are trusted worldwide to help protect electrical installations, industrial equipment and critical infrastructure from the damaging effects of lightning strikes and transient overvoltages.