Surge Protection Devices (SPD)

Our surge protection devices (SPD) are suitable for lightning & surge protection of low-voltage systems, power supplies, communication networks, PV systems and street/outdoor lighting.

They meet the requirements of UL 1449 Forth Edition and IEC/EN 61643-11.

Depending on the design, they can be mounted on DIN rails in control cabinets, combiner boxes or optimized for installation in street lights.

They are fail-safe, have an fault display and a remote signaling contact.

They are robust and well protected against harsh environmental conditions and meet the requirements for high reliability in important areas.

SPD for PV System


  • Combiner boxes
  • Photovoltaic Inverter
  • DPU
  • DC Lightning Protection Box
  • DC Power Supply
  • Energy Storage Converter
  • DC Junction Box

SPD for Low-voltage Systems


  • AC / DC Power System
  • New Energy
  • Residential Building
  • Telecommunications
  • Internet Data Center (IDC)
  • Distribution System

SPD for Outdoor Lighting


  • Outdoor Street Lighting
  • Parking Lighting
  • Highway Lighting
  • Landscape Lighting
  • Traffic and Signal Lighting

SPD for Signaling Networks


  • Surveillance Camera
  • POE Equipment
  • Switch
  • Control System Interface
  • Instrument   
Surge protecion device for low voltage applicationSurge protecion device for signal networksSurge protecion device for PV systemsSurge protecion device for lighting applicationsSPD for Low-voltage SystemsSPD for Signaling NetworksSPD for Outdoor LightingSPD for PV System


α Therm


Alpha Therm GmbH - Your specialist for temperature-dependent

electronic components and circuit protection

Phone: [+49] 6202 / 575688 - 0

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Phone: +49 6202 / 575688 - 0

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