Single-phase filters are pivotal in safeguarding sensitive electronics across industries. In industrial automation, they suppress harmonics and transients from servo motors and variable frequency drives (VFDs) in CNC machines, ensuring stable operation of PLCs and robotic arms. Renewable energy systems integrate them into solar microinverters and battery storage units to block switching noise from propagating to the grid, complying with IEEE 1547-2023 interconnection protocols. Medical devices, such as portable ultrasound machines and dialysis equipment, rely on medical-grade filters (IEC 60601-1 compliant) with ultra-low leakage current (<0.5mA) to eliminate 50/60Hz line noise while ensuring patient safety. Consumer electronics, including high-end audio amplifiers and gaming PCs, use these filters to reduce audible hum and meet CE/EMC directives. Electric vehicle charging stations deploy ruggedized variants with IP65-rated enclosures to filter PWM-induced noise in Level 2 chargers, enhancing compatibility with smart grid infrastructures.