INDUSTRY COMPONENT

Y-Capacitor (Line-to-Ground)

Y-capacitor for line-to-ground EMI suppression in industrial equipment

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Component Specifications

Definition
A specialized safety capacitor designed to suppress electromagnetic interference (EMI) by providing a low-impedance path between power lines and ground, specifically rated for line-to-ground applications where failure could create shock hazards. These capacitors must meet stringent safety standards due to their position in circuits where they bridge hazardous voltage to protective earth.
Working Principle
Operates by providing capacitive coupling between AC power lines and ground, shunting high-frequency noise currents to earth while blocking low-frequency power currents. The capacitor's dielectric withstands high voltage transients and maintains insulation resistance to prevent leakage currents from exceeding safety limits.
Materials
Metallized polypropylene or polyester film dielectric, epoxy resin encapsulation, copper or tin-plated steel leads, flame-retardant plastic case (typically UL94 V-0 rated)
Technical Parameters
  • Tolerance ±20% typical
  • Safety Class Y1, Y2, or Y4 per IEC 60384-14
  • Rated Voltage 250VAC to 440VAC
  • Leakage Current <0.25mA typical at 250VAC
  • Capacitance Range 100pF to 10nF
  • Temperature Range -40°C to +110°C
  • Dielectric Strength ≥4kV AC for 60 seconds
  • Insulation Resistance ≥10,000 MΩ
Standards
IEC 60384-14, UL 60384-14, EN 60384-14, IEC 60950-1, IEC 62368-1

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Y-Capacitor (Line-to-Ground).

Y capacitor line-to-ground capacitor EMI filter capacitor safety capacitor EMC filter component industrial capacitor electrical noise suppression Y-Capacitor (Line-to-Ground) Y-Capacitor (Line-to-Ground) in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Input Filter (EMC Filter)

An electromagnetic compatibility filter designed to suppress conducted electromagnetic interference (EMI) entering or leaving a device via the DC input power lines.

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Engineering Analysis

Risks & Mitigation
  • Electric shock hazard if capacitor fails short
  • Excessive leakage current causing ground faults
  • Fire risk from dielectric breakdown
  • EMC non-compliance if incorrectly specified
  • Reduced equipment lifespan from improper derating
FMEA Triads
Trigger: Dielectric breakdown due to voltage transients
Failure: Capacitor short circuit creating shock hazard
Mitigation: Use Y1 or Y2 safety-rated capacitors with adequate voltage derating (typically 50% margin), implement surge protection devices upstream
Trigger: Thermal stress from high ambient temperatures
Failure: Increased leakage current, reduced capacitance, eventual open circuit
Mitigation: Select capacitors with appropriate temperature rating (+110°C minimum for industrial applications), ensure adequate ventilation, monitor operating temperature
Trigger: Mechanical vibration in industrial environments
Failure: Lead breakage, internal connection failure
Mitigation: Use capacitors with reinforced leads, proper PCB mounting with strain relief, vibration-resistant encapsulation

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Capacitance tolerance ±20% maximum, leakage current <0.25mA at rated voltage, dielectric withstand 4kV AC for 60 seconds minimum
Test Method
IEC 60384-14 safety tests: dielectric strength, insulation resistance, endurance (1000 hours at rated voltage and temperature), humidity resistance, flammability testing per UL94

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 (line-to-line) and fail short, while Y capacitors are connected between line and ground (line-to-ground) and must fail open to prevent shock hazards. Y capacitors have stricter safety requirements.

Why are Y capacitors critical for EMC compliance?

Y capacitors provide essential high-frequency grounding paths for electromagnetic interference without allowing dangerous leakage currents. They help meet conducted emissions limits (typically 150kHz-30MHz) in international EMC standards.

What happens if a Y capacitor fails?

Properly rated Y capacitors are designed to fail open-circuit (not short-circuit) to maintain isolation between line voltage and ground. This prevents electric shock hazards but may reduce EMI filtering effectiveness.

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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