INDUSTRY COMPONENT

Y-Capacitor

Y-capacitor is a safety capacitor used in EMI filters to suppress common-mode interference by connecting between line/neutral and ground.

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Component Specifications

Definition
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.
Working Principle
Y-capacitors work by providing a controlled capacitive coupling between the power lines and ground. They create a low-impedance path for high-frequency common-mode noise currents to flow safely to ground, while blocking lower frequency power currents. This differential filtering action suppresses electromagnetic interference without compromising electrical safety, as they are designed to fail open-circuit rather than short-circuit.
Materials
Metallized polypropylene or polyester film dielectric with self-healing properties, epoxy resin encapsulation, copper or tinned copper leads, flame-retardant plastic casing meeting UL94 V-0 rating.
Technical Parameters
  • Tolerance ±20%
  • Safety Class Y1, Y2, Y3, Y4
  • Rated Voltage 250V AC/400V DC
  • Capacitance Range 100pF to 10nF
  • Temperature Range -40°C to +125°C
  • Dielectric Strength ≥4,000V AC for 60 seconds
  • Insulation Resistance ≥10,000 MΩ
Standards
IEC 60384-14, UL 60384-14, EN 60384-14, GB/T 6346.14

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Y-Capacitor.

Y capacitor safety capacitor EMI filter capacitor Class Y capacitor common-mode filter electromagnetic interference suppression electrical safety component Y-Capacitor Y-Capacitor in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

EMI Filter

A passive electronic component designed to suppress electromagnetic interference (EMI) in industrial electrical systems.

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Power Line Filter(s)

Electrical component that suppresses electromagnetic interference (EMI) and radio frequency interference (RFI) from power lines

View Product Details

Input Filter

An electrical component that filters and conditions the incoming AC power before it reaches the rectifier stage of an AC-DC converter.

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Engineering Analysis

Risks & Mitigation
  • Electric shock hazard if capacitor fails shorted
  • Ground leakage current exceeding safety limits
  • Reduced effectiveness due to aging or temperature extremes
  • Incorrect installation causing safety compliance issues
FMEA Triads
Trigger: Dielectric breakdown due to voltage spikes
Failure: Short circuit between terminals
Mitigation: Use self-healing dielectric materials, implement overvoltage protection circuits, select appropriate safety class (Y1/Y2)
Trigger: Thermal stress from high ambient temperatures
Failure: Increased leakage current, reduced capacitance
Mitigation: Select capacitors with appropriate temperature rating, ensure proper ventilation, monitor operating temperature
Trigger: Mechanical damage during installation
Failure: Cracked casing leading to moisture ingress
Mitigation: Follow proper handling procedures, use strain relief for leads, implement visual inspection

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Capacitance tolerance ±20%, leakage current <0.25mA for medical devices, impulse withstand voltage per safety class
Test Method
IEC 60384-14 safety tests including dielectric strength, insulation resistance, endurance, humidity resistance, and flammability tests

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between X and Y capacitors?

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.

Why are Y-capacitors considered safety components?

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.

What do Y1, Y2, Y3, and Y4 classifications mean?

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.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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X-Capacitor (Line-to-Line) Y-Capacitor (Line-to-Ground)