行业组件数据 · 2026

Y电容（线对地）

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

技术定义与适配语境

典型 Y电容（线对地）会按材料、尺寸公差、适配关系和失效风险在电气设备制造中评估。

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.

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组件规格

定义

工作原理

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.

材料

Metallized polypropylene or polyester film dielectricepoxy resin encapsulationcopper or tin-plated steel leadsflame-retardant plastic case (typically UL94 V-0 rated)

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

标准

IEC 60384-14UL 60384-14EN 60384-14IEC 60950-1IEC 62368-1

行业分类与别名

Y电容（线对地）的常用贸易名称、技术标识和检索关键词。

上级产品

该组件会出现在以下整机或工业产品中。

输入滤波器（EMC滤波器）

一种电磁兼容性滤波器，设计用于抑制通过直流输入电源线进入或离开设备的传导电磁干扰（EMI）。

查看产品详情 ->

FMEA · 风险与缓解

诱因 → 失效模式 → 工程缓解

Dielectric breakdown due to voltage transients->Capacitor short circuit creating shock hazard->Use Y1 or Y2 safety-rated capacitors with adequate voltage derating (typically 50% margin), implement surge protection devices upstream

Thermal stress from high ambient temperatures->Increased leakage current, reduced capacitance, eventual open circuit->Select capacitors with appropriate temperature rating (+110°C minimum for industrial applications), ensure adequate ventilation, monitor operating temperature

Mechanical vibration in industrial environments->Lead breakage, internal connection failure->Use capacitors with reinforced leads, proper PCB mounting with strain relief, vibration-resistant encapsulation

工业生态与工程逻辑

兼容对象

Industrial power supplies Variable frequency drives Servo motor controllers PLC systems Automation equipment Medical devices Telecommunications equipment

可替换件

TDK Murata Vishay KEMET Panasonic Würth Elektronik Yageo

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

合规与检测

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

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采购评估维度

不是客户评论，也不是实时热度。以下维度用于前期 RFQ 准备和供应商评估。

技术文档

4/5

制造能力

4/5

可检验性

5/5

供应商透明度

3/5

这些分值是采购评估维度示例，不代表真实客户评分、具体国家买家反馈或实时询盘。

常见问题

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.

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CNFX Industrial Component Index · 电气设备制造

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