20 PCS 400V 3A Polarized Rectifier Diodes FR304 for Solar Panel Overview These FR304 polarized rectifier diodes are designed to support DC power applications where controlled current flow and reverse current prevention are required. Each diode is rated for 400 volts and 3 amps, supplied in a pack of 20 to support repairs, replacements, and small production runs. Key benefits Prevents reverse current and protects solar panels and batteries from backfeed. Improves conversion performance by ensuring unidirectional current flow in DC circuits. Reliable electrical ratings for mediumpower solar and DC applications. Convenient 20piece pack for maintenance, prototyping, or multiple installations. Main features and specifications Model: FR304 Quantity: 20 pieces Voltage rating: 400 V Current rating: 3 A Polarized rectifier function: allows current flow in one direction and blocks reverse flow Component type: rectifier diode suitable for common DC power circuits Why customers need these diodes Protects panels and battery systems from damaging reverse currents during lowlight or nighttime conditions. Provides a simple, costeffective way to restore or maintain reliable diode protection in charge controllers and solar junction boxes. Useful for hobbyists and technicians who need a consistent supply of identical diodes for testing and assembly. Compatibility and practical notes Intended for use in solar panel systems and other DC circuits that require rectification or blocking diodes. Suitable for integration into charge controllers, panel arrays, battery protection circuits, and general DC power electronics that match the 400 V and 3 A ratings. Ensure the diode ratings match or exceed the voltage and current conditions of your specific circuit for safe operation. Use scenarios Solar panel blocking diode: Install one diode per panel or string to prevent reverse current flow into panels at night, helping maintain battery charge. Charge controller repairs: failed or aging rectifier diodes in charge controllers to restore proper directionality and prevent battery discharge. DIY solar projects and prototypes: Use the 20piece pack to build and test multiple smallscale solar circuits, power supplies, or DC protection modules. What is included 20 polarized rectifier diodes, model FR304, rated 400 V and 3 A. Technical reminder Verify system voltage and current requirements before installation. Use appropriate heat sinking or mounting practices as required by your circuit design. This product provides a straightforward solution for protecting and improving the reliability of solar and DC power circuits where 400 V, 3 A polarized rectification is needed.