It is a component that integrates both a resistor and a capacitor, and is generally referred to as an X2 RC network.
So how can we judge X2 safety capacitor RC quality?

INTRODUCTION

The core method is to verify its capacitor section and built-in resistor section separately, combined with a visual inspection.
The commonly used tool is a digital multimeter.

Below are the detailed steps: 

1. Visual Inspection

• Check the appearance of the X2 Safety Capacitor RC for signs of cracking, deformation, or charring.

• Examine whether the pins have issues such as severe oxidation, corrosion, or breakage.

• Verify if the specification parameters on the surface are illegible.

2. Testing the X2 Safety Capacitor RC Built-in Resistor

• The resistance value of the built-in resistor in an X2 RC snubber for AC power typically ranges from 1MΩ to 10MΩ.

• Touch the two pins of the component with the probes of the digital multimeter respectively.
  If the displayed resistance value matches the nominal value or the deviation is within ±10%, the resistor section is in normal condition.

3. Insulation Test

• Touch the X2 Safety Capacitor RC two pins with the multimeter probes.
  If the display shows OL, the insulation is good and there is no leakage.
  If a numerical value is displayed and the buzzer sounds, the capacitor has leakage and is unfit for use.

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WEE Technology Published on Dec 26, 2025