Y-capacitor is a safety capacitor used in EMI filters to suppress common-mode interference by connecting between line/neutral and ground.
A Y-capacitor, classified as a Class Y capacitor according to safety standards, is specifically designed for connection between live conductors (line/neutral) and ground in electrical circuits. It provides a low-impedance path for high-frequency common-mode noise to ground while maintaining electrical safety through reinforced insulation and self-healing properties. These capacitors are essential components in EMI filters for preventing electromagnetic interference from entering or exiting electronic equipment.
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X-capacitors are connected between line and neutral (differential mode filtering) while Y-capacitors are connected between line/neutral and ground (common-mode filtering). Y-capacitors have stricter safety requirements due to their connection to ground.
Y-capacitors must meet stringent safety standards because they connect directly to ground. They are designed with reinforced insulation and self-healing properties to prevent electric shock hazards even if they fail.
These classifications indicate different safety levels based on rated impulse voltage: Y1 (8kV), Y2 (5kV), Y3 (n/a), Y4 (2.5kV). Higher numbers indicate higher safety requirements for different applications.
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