Tecget 2-String DC Surge Protection Device Type 2 (QTGPVGAK12MC4)

On a commercial rooftop, a solar installer opens the DC combiner box and checks the status of each surge protective device. A quick glance at the green indicator confirms both PV strings are protected from lightning-induced voltage spikes. The Tecget 2-String DC Surge Protective Device Type 2 is engineered for exactly this scenario—reliable protection with minimal maintenance.

Key specifications

• Type: Type 2 DC Surge Protective Device (SPD)
• Application: Photovoltaic (PV) systems, DC circuits
• Number of poles: 2P (2-pole)
• Maximum continuous operating voltage (Uc): 1000 V DC
• Nominal discharge current (In): 20 kA (8/20 µs)
• Maximum discharge current (Imax): 40 kA (8/20 µs)
• Voltage protection level (Up): ≤ 3.2 kV
• Response time: < 25 ns
• Mounting type: 35mm DIN rail
• Operating temperature range: -40°C to +80°C
• Protection degree: IP20
• Standards compliance: IEC 61643-31, EN 50539-11
• Visual status indicator: Yes (green = OK, red = replace)
• Modular design: Pluggable protection modules
• Connection terminals: Screw terminals
• Wire cross section: 4-35 mm² (AWG 12-2)
• Housing material: Flame-retardant thermoplastic

Why choose it

This SPD combines a high discharge capacity of 40 kA with an ultra-fast response time under 25 nanoseconds, effectively preventing damage to inverters and modules. Its pluggable protection modules allow for quick replacement without rewiring, significantly reducing downtime during maintenance. The visual status indicator provides at-a-glance system health checks, ensuring your PV array remains operational and safe.

Ideal use cases

• Commercial rooftop PV installations requiring robust surge protection for two DC strings.
• Solar farms and ground-mounted systems where lightning strikes are a concern.
• Retrofitting existing DC combiner boxes with DIN rail-mounted SPDs.
• Maintenance teams needing quick module replacement to minimize system downtime.

Good to know

The SPD is designed for harsh environments, with an operating temperature range from -40°C to +80°C and a flame-retardant thermoplastic housing. It complies with international standards IEC 61643-31 and EN 50539-11, ensuring reliable performance and safety. Installation is straightforward on a standard 35mm DIN rail, and the screw terminals accommodate wire cross sections from 4 to 35 mm² (AWG 12-2).