Finder 7P.24.8.275.K110 Type 2 Surge Protective Device for Photovoltaic Systems, 3-Pole, 1100 V DC, 20 kA (8/20 µs), DIN Rail

Photovoltaic installations are exposed to transient overvoltages caused by lightning strikes or switching operations. The Finder 7P.24.8.275.K110 is a Type 2 surge protective device (SPD) engineered to protect the DC side of PV systems up to 1100 V DC. It limits voltage spikes to a safe level, preventing damage to inverters and other sensitive components.

Who is it for

This SPD is intended for solar installers and electrical contractors who need reliable protection for large-scale PV arrays, especially those with long DC cable runs or in areas with high lightning activity. It is suitable for use in combiner boxes and inverter inputs.

Main features

• Type 2 surge protection for photovoltaic DC circuits
• Maximum continuous operating voltage (Uc): 1100 V DC
• Nominal discharge current (In): 20 kA (8/20 µs)
• Maximum discharge current (Imax): 40 kA (8/20 µs)
• Voltage protection level (Up): less than 4.0 kV
• 3-pole configuration for positive, negative and earth
• Pluggable modules for easy replacement without rewiring
• Integrated thermal disconnector with visual status indication (green/red)
• Remote signaling contact for monitoring
• DIN rail mounting

Specifications

• SPD type: Type 2
• Application: Photovoltaic (PV) systems
• Maximum continuous operating DC voltage (Uc): 1100 V DC
• Nominal discharge current (In): 20 kA (8/20 µs)
• Maximum discharge current (Imax): 40 kA (8/20 µs)
• Voltage protection level (Up): < 4.0 kV
• Number of poles: 3
• Response time: < 25 ns
• Operating temperature range: -40 to +80 °C
• Mounting type: DIN rail
• Protection degree: IP20
• Remote signaling contact: Yes
• Standards: EN 50539-11, EN 61643-11
• Thermal disconnector: Integrated
• Visual status indication: Yes (green/red)
• Modular design: Pluggable modules
• Housing material: Thermoplastic, UL 94 V-0

Tips

Install the SPD as close as possible to the inverter or the equipment to be protected, keeping lead lengths short to minimize let-through voltage. For optimal protection, combine with Type 1 SPDs at the main distribution board if the building has external lightning protection.