Schaffner 1200 VDC Power Line Filter FN2200-25-33 for Solar Noise Suppression

The Schaffner FN2200-25-33 is a high-performance 1200 VDC power line filter designed to suppress conducted emissions from photovoltaic (PV) inverters. This filter prevents high-frequency (HF) and very high-frequency (VHF) noise from radiating over the DC cables connecting the inverter to the solar panels.

Why Use the FN2200-25-33 in Solar Systems?

Solar panels themselves are immune to electromagnetic interference (EMI), but the connected inverter system can generate significant high-frequency noise that may interfere with HF and VHF communications. Without proper filtering, this noise can radiate through the DC wiring, impacting nearby radio receivers and communication systems. Installing the FN2200-25-33 effectively mitigates this issue.

Key Features & Benefits

• Effective EMI Suppression: Reduces high-frequency noise emissions from solar inverters, preventing interference with HF/VHF radio signals.
• Optimized for PV Systems: Designed specifically to filter conducted noise on the DC side of solar power systems.
• Dual-Filter Installation for Maximum Efficiency: For best results, install one FN2200-25-33 at the inverter and another near the solar panels to minimize radiated emissions.
• Compact and Robust Design: Easy to integrate into new or existing solar setups.
• Compliance with EMC Standards: Ensures electromagnetic compatibility in accordance with international regulations.

Technical Specifications

• Voltage Rating: 1200 VDC
• Current Rating: 25 A @ 55°C
• Operating Frequency: DC
• Overload Capability: 4× rated current at switch-on; 1.5× rated current for 1 min/hour
• Insulation Test Voltage: 3600 VDC (P → E); 3000 VDC (P → P)
• Temperature Range: -40°C to +100°C
• Protection Rating: IP20
• Certifications: UL 1283, CSA 22.2 No. 8 1986, IEC/EN 60939

Application & Installation

To maximize noise suppression in a PV system:

1. Install one FN2200-25-33 close to the solar inverter.
2. Install a second FN2200-25-33 near the solar panel array.

This dual approach minimizes the propagation of high-frequency emissions along DC wiring, ensuring compliance with EMC requirements and maintaining a clean RF environment.

Conclusion

The Schaffner FN2200-25-33 power line filter is an essential component for mitigating inverter-induced EMI in solar power systems. By suppressing high-frequency noise, it prevents unwanted HF/VHF interference, ensuring stable operation for radio communications and other sensitive equipment.