Purpose: Suppresses electromagnetic interference (EMI) and radio frequency interference (RFI) conducted through power lines.

Key Functions:

• Prevents external noise from entering equipment (immunity)
• Stops internal noise from propagating back into the power grid (emission)
• Improves electromagnetic compatibility (EMC)

Typical Components:

• X-capacitors (line-to-line)
• Y-capacitors (line-to-ground)
• Common-mode chokes
• Differential-mode inductors

Applications: Switch-mode power supplies, industrial electronics, medical devices, consumer electronics.

Standards: Complies with IEC/EN 60939, CISPR, FCC Part 15.

Mounting: Chassis mount, PCB mount, or DIN rail.

Note: Proper grounding is critical for safety and performance.