X2 Heavty Duty Safety Capacitors B32933B3474K289 VS X2F474KA3050225B000T

Introduction 

 

X2 safety capacitors are critical components in electrical equipment, especially for EMI (Electromagnetic Interference) filtering. They comply with international safety standards and prevent electric shock risks. This article compares two X2 capacitor models—B32933B3474K289 (from EPCOS AG) and THB series X2 0.47μF 305VAC—based on their technical parameters. It also analyzes their applications in electricity meters and power supplies, and expands on other typical use cases.

Parameter Comparison Between Two X2 Capacitor Models. The two models are mainly designed for 0.47μF capacitance applications. Most parameters meet industry standards, but there are minor differences that affect their performance in specific scenarios.

 

1. Voltage-Related Parameters 

Rated AC operating voltage: Both models reach ≥305VAC. This meets the voltage requirement of electricity meters (which use 230±46V input) and power supplies, ensuring stable operation under normal voltage fluctuations.

Increased operating AC voltage: B32933B3474K289 supports ≥440VAC for 500 hours, while the THB series has a max rated voltage of 305VAC. For equipment needing short-term high-voltage resistance (like power supplies during startup), B32933B3474K289 is more reliable.

 

2. Capacitance Performance 

Nominal capacitance: Both are 0.47μF, matching the basic filtering needs of electricity meters and power supplies.

Capacitance tolerance: Both have a ±10% max tolerance at 25°C. For capacitance change over time: B32933B3474K289 maintains ±10% for 220,000 hours at 40°C, while the THB series does so for 175,200 hours. B32933B3474K289 has better long-term stability, suitable for electricity meters (which need 30-year service life).

 

3. Physical and Environmental Parameters

Operating temperature range: B32933B3474K289 works at –40…+100°C, while the THB series extends to +110°C. The THB series is better for high-temperature environments (like power supplies in enclosed cabinets).

Insulation resistance: B32933B3474K289 requires ≥6000MΩ, and the THB series reaches ≥10,638MΩ. Higher insulation resistance reduces leakage current, critical for electricity meters (which need high measurement accuracy).

Mechanical dimensions: Both have a lead spacing of 22.5mm and length ≤26.5mm, fitting the compact space in electricity meters and power supplies.

 

Applications in Electricity Meters and Power Supplies

 

1. Electricity Meters

Electricity meters need long-term reliability and high accuracy. The two X2 capacitors play a key role in EMI filtering:

They reduce interference from the power grid, ensuring accurate energy measurement.

B32933B3474K289’s 220,000-hour stability and 440VAC high-voltage resistance meet the 30-year service life requirement of meters.

The THB series’ +110°C temperature resistance suits meters installed in outdoor cabinets (which face high temperatures in summer).

 

2. Power Supplies

Power supplies (like AC-DC adapters) need stable filtering and startup performance:

Both models’ 305VAC rated voltage handles normal input voltage.

B32933B3474K289’s 440VAC short-term high-voltage resistance prevents damage during power-on surges.

The THB series’ low dissipation factor (≤0.001 at 1kHz) reduces energy loss, improving power supply efficiency.

 

Other Application Scenarios of X2 Capacitors

X2 capacitors are widely used beyond meters and power supplies. Different scenarios have specific parameter requirements:

 

1. Household Appliances (Washing Machines, Air Conditioners)

Key requirements: Flame retardancy and safety. Both models have 94V-0 flame retardant grade, preventing fire risks.

Additional needs: Small size (to fit appliance interiors) and SnPb lead plating (for reliable soldering). The two models meet these needs, making them suitable for EMI filtering in appliance control boards.

 

2. Industrial Control Equipment (PLCs, Inverters)

Key requirements: Wide temperature range and high reliability. B32933B3474K289’s –40…+100°C range and the THB series’ +110°C resistance adapt to factory environments (which have large temperature changes).

Critical parameter: High insulation resistance (≥6000MΩ) to avoid interference with sensitive control signals.

 

3. New Energy Equipment (Solar Inverters)

Key requirements: High voltage resistance and humidity tolerance. B32933B3474K289’s 440VAC increased voltage and both models’ THB test compliance (±10% capacitance change after 85°C/85% humidity) handle the harsh conditions of solar power systems.

 

4. Consumer Electronics (TVs, Computers)

Key requirements: Low noise and small size. The two models’ 0.47μF capacitance effectively filters EMI, and their compact dimensions fit the slim designs of modern electronics.

 

Conclusion

The B32933B3474K289 and THB series X2 capacitors both meet the basic needs of electricity meters and power supplies. B32933B3474K289 excels in long-term stability and high-voltage resistance, while the THB series is better for high-temperature environments. Beyond these two applications, X2 capacitors are essential in household appliances, industrial control, and new energy equipment—with their parameter requirements varying by scenario. Choosing the right X2 capacitor ensures equipment safety, stability, and long service life.

 

 

UF capacitors is proud to announce that our X2(THB) MKP heavy duty safety cap can replace EPCOS, Vishay, Kemet, Pilkor, Panasonic TDK heavy duty series. We have passed the safety approval include ENEC, UL, CQC, KC/KTL. Click here to view our datasheet

 

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