DC Surge Protection Device (PV SPD)

A DC SPD, also known as a PV Surge Protection Device, is installed between solar PV strings, combiner boxes, inverters, and DC distribution panels. It safely diverts surge currents caused by lightning or switching events to the grounding system, protecting solar modules, inverters, batteries, and other DC equipment.

These devices are specifically designed to withstand the high DC voltages found in photovoltaic systems and are essential for improving system reliability and reducing downtime.

Key Features

• Designed for photovoltaic DC systems
• High surge current capacity
• Fast response time
• Thermal disconnection mechanism
• Plug-in replaceable modules (model dependent)
• Status indication window
• DIN rail mounting
• UV- and weather-resistant options for outdoor enclosures

Common Applications

• Solar PV Arrays
• String Combiner Boxes
• Solar Inverters
• Battery Energy Storage Systems (BESS)
• Solar Pumping Systems
• Rooftop Solar Installations
• Utility-Scale Solar Plants

Typical Specifications

• SPD Type: Type 2 DC or Type 1+2 DC (application dependent)
• Maximum Continuous Operating Voltage (Uc): 600–1500 V DC
• Nominal Discharge Current (In): 20–40 kA
• Maximum Discharge Current (Imax): Up to 80 kA
• Mounting: 35 mm DIN Rail
• Standards: IEC 61643-31, EN 61643-31