What is temperature humidity bias for film capacitors

Around 2008, film capacitors demand were very huge in led lighting and in power meters. X2 MKP Capacitors 0.47uF 0.22uF 0.1uF were widely used in power meter. While, manufacturers of power meter found a problem, after some time, the capacitance of above 0.22uF 0.1uF 0.47uF film capacitors faced a capacitance failure, that X2 MKP capacitors’ capacitance was decreasing. Arcotronics (late was bought by Kemet), Epcos all faced this same problems.

 

Every engineers wanted to solve this problem in power meter circuit. UF Capacitors, as one of the China famous film capacitors factory also had investigated this problem.

 

Finally, the solution was clear. THB grade X2 capacitors could solve this problem.

 

What is THB grade x2 capacitors? What is temperature humidity bias?

 

The temperature-humidity-bias (THB) test is the standard for accelerated stress testing with respect to corrosion and other humidity driven degradation mechanisms. Usually, 1000 hrs tests at 85 degree Celsius and 85 percent relative humidity (85/85) are used to predict up to 25 years of operation.

 

The X2 THB series from UF capacitors film capacitors are designed for class X2 safety applications in harsh environmental conditions.

 

What are main features and properties for THB X2 MKP Capacitors film capacitors?

 

1. For interference suppression
2. For harsh environmental conditions (temperature, humidity)
3. Self-healing properties
4. THB X2 MKP CAPACITORS are used in power meter circuit, as power meter is heavy duty device, and it worked under harsh environmental conditions.

 

What are Applications for THB X2 MKP Capacitors Film Capacitors?

 

1. Safety applications
2. Mains Voltage Filter
3. Interference suppression
4. energy meter, power meter, smart meter, water meter, gas meter
5. Across the Line
6. Power supplies

 

If customer look for X2 MKP capacitors for power meter, energy meter, they need to consider temperature humidity bias, and UF Capacitors suggest customer to consider UF Capacitors’ THB Series, X2 metallized polypropylene film capacitors, which have below features:

 

High robustness under high humidity.

Test condition: test damp heat, steady state; 85 °C / 85 % RH duration 1000 h, rated voltage applied.

High reliability in capacitors performance

And heavy duty capacitors suits for harsh environmental conditions.

 

Regular items listed for THB Series X2 metallized polypropylene film capacitors:

 

X2 0.1uF 305VAC +/-10% P:10mm Bulk RoHS

X2 0.1uF 310VAC +/-10% P:10mm Bulk RoHS

 

X2 0.22uF 305VAC +/-10% P:10mm Bulk RoHS

X2 0.22uF 310VAC +/-10% P:10mm Bulk RoHS

 

X2 0.47uF 305VAC +/-10% P:15mm Bulk RoHS

X2 0.47uF 310VAC +/-10% P:15mm Bulk RoHS

 

More key words related this article as follow. Also these are names from other manufacturers regarding temperature humidity bias film capacitors?

 

RFI X2 Capacitors
THB Grade IIB Capacitors
EMI suppression capacitors
Safety capacitors
Safety Class X2 MKP Capacitors