What is the difference between an X1 capacitor and an X2 capacitor?

When it comes to X safety capacitors, the most common ones are X1 and X2 capacitors.

 

X safety capacitors have a non-inductive structure, made from metallized polypropylene film as the dielectric/electrode, wound into a coil. The leads are made from tin-plated copper-clad steel wire, and the capacitor is sealed in a plastic casing using epoxy resin. They are primarily used for power line EMI suppression circuits and other AC applications.

 

X capacitors are divided into X1, X2, and X3, with the main differences being:

X1: High-voltage tolerance greater than 2.5 kV and less than or equal to 4 kV.

X2: High-voltage tolerance of less than or equal to 2.5 kV.

X3: High-voltage tolerance of less than or equal to 1.2 kV.

 

Currently, the most common safety capacitors are rated at 275V, 305V, and 310V. The higher the rated voltage, the greater the voltage tolerance margin, leading to a longer service life.

 

While they serve similar functions, what are the differences between X1 and X2 capacitors?

 

Price

X1 safety capacitors are relatively expensive, which is why they are used less frequently.

X2 safety capacitors are more affordable, offering better cost-performance, which is why X2 capacitors are the most widely used among X safety capacitors.

 

Same Function

The functional difference between the two is minimal, and they can even be considered identical in function.

X capacitors are connected between the two power lines (L-N) to suppress electromagnetic interference (EMI) from the power supply.

Both X1 and X2 safety capacitors can also be used as resistive-capacitive dropper capacitors.

 

Voltage Rating

The voltage rating of X1 and X2 capacitors differs:

X1: >2.5 kV ≤4.0 kV

X2: ≤2.5 kV

 

Photo	Description	UF Capacitors Series Code	Vishay SPRAGUE	Kemet	Pilkor	Panasonic	TDK/EPCOS	Suntan	Faratronic
	X2 Metallized Polypropylene Film Capacitor	X2 Series	MKP3382 Series MKP3384 Series MKP3392 Series	R46 Series PHE840M Series PHE850 Series PMR-209 Series	PCX2 337 Series PCX2 339 Series	ECQU Series	B32921C/D-B32928C/D Series B81 130 Series	TS08S Series TS08V Series TS08H Series	C42(E)MKP62 Series

 

For buyers, we have our X2 safety capacitor cross reference as below:

 

About US

 

UF Capacitors is an ISO9001-certified manufacturer in China, founded in 1995. We hold military qualifications for tantalum capacitors, MLCC, and other products. Additionally, we have a UL-recognized test laboratory located at our factory site.

 

Our marketing position is to provide a superior alternative to first-tier brands such as TDK, Murata, AVX, EPCOS, Vishay, and Panasonic. We offer similar quality but at better prices, with faster lead times and excellent service. With extensive experience working with renowned international companies like GE, Philips, Jabil, and Flex, we have built a strong reputation.

 

UF Capacitors serves the consumer electronics, computing, communications, and industrial markets. As a professional Chinese electronic components manufacturer, we are dedicated to delivering high-quality electronic components, exceptional management, strict quality control systems, and excellent sales service. We strive to foster mutually beneficial partnerships and drive business growth.

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