X2 Film Capacitors for Capacitive Divider in Metering Applications

X2 safety capacitors are widely used in capacitive divider circuits for metering equipment.
In energy meters, power meters, and water meters, these capacitors provide a stable voltage drop
from the AC mains while maintaining compliance with safety requirements.
The TS08A series is designed for such applications where long-term reliability and controlled capacitance are required.

Role of X2 Capacitors in Capacitive Divider Circuits

Capacitive dividers are used to derive a low-current supply from the AC line without using a transformer.
In this topology, the X2 capacitor functions as a series impedance element.
Compared with resistive dividers, the capacitive approach reduces power dissipation and heat generation.

• Limits current from the AC mains through reactance
• Provides stable voltage drop for low-power control circuits
• Reduces thermal losses compared with resistive methods
• Supports compact meter designs

Electrical Characteristics Relevant to Meter Design

For metering systems operating continuously on the AC line, the capacitor must maintain stable capacitance over time.
Self-healing film technology helps prevent catastrophic failure under transient overvoltage.
X2 safety classification ensures suitability for connection across the mains in interference suppression and divider circuits.

• X2 safety class for across-the-line operation
• Stable capacitance for predictable divider ratio
• Low loss characteristics for continuous operation
• Self-healing dielectric structure

Applications

• Energy meters
• Power meters
• Water meters
• AC line powered monitoring devices

Design Considerations

• Select capacitance based on required current and operating frequency
• Verify long-term stability under continuous AC stress
• Ensure compliance with safety standards for across-the-line components
• Consider environmental conditions such as temperature and humidity

For detailed electrical specifications and dimensional data, refer to the TS08A datasheet.

For design-in support and technical inquiries, please contact:

sales@suntan.com.hk

info@suntan.com.hk