Ceramic Safety Capacitors - Engineering Center

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Ceramic Safety CapacitorsAvoiding the Confusion


Outline

• What are safety capacitors?

• Certification and Classification

• Lead Styles

• KEMET Ceramics Offering

• Key Takeaways


Primary Function?


Devices Need Power


Home Dryer ExampleIdeal Scenario

240VAC

Time (s)Vo

lta

ge


Home Dryer ExampleReal Scenario

Lightning Strike

240VAC

Time (s)Vo

lta

ge


How do we Reduce EMI on AC Line?AC Line Filter

AC line filterLine/HOT

NeutralGround

Cx Cx Cx

Cy

Cy

Cy

Cy

Inductor

Class X CapacitorsLine to Neutral

Line to Line

Class Y CapacitorsLine to Ground


What happens if X or Y capacitor fails?

Blow fuse or fire Electric Shock

Class X Capacitors Class Y Capacitors


Defining Safety Capacitors

✓

Line to Line

Line to Ground

X / Y


Outline



• Lead Styles


• Key Takeaways


Safety CertificationsIEC 60384-14

UL 60384-14


Safety CertificationsPurpose of IEC 60384-14?


Safety CertificationsThe Process

VDE IMQ TUV DEMKO

IEC 60384-14

FIMKO

Main Specification

Certification Body

Individual Certification

Body Mark

Harmonized Certification Mark

UL 60384-14

UL

=


Safety Certifications

✓ Proper markings per 60384-14

✓ Up-to-date license (certificate) available


Sub ClassificationPer IEC 60384-14

Subclass Peak Impulse

Voltage in Service

Application Peak Impulse before

endurance test

X1>2.5 kV

≤ 4.0 kV

High pulse application

(Industrial)

4 kV per C ≤ 1µF

4/√C kV per C >1µF

X2≤ 2.5 kV General purpose

(Home appliance)

2.5 kV per C ≤1µF

2.5/√C kV per C >1µF

Subclass Rated Voltage Type of Bridged

Insulation

Peak Impulse before

endurance test

Y1≤ 500 Vac Double insulation or

reinforced Insulation

(Industrial)

8 kV

Y2≥ 150 Vac

≤ 500 Vac

Basic insulation or

supplementary insulation

(Home appliance)

5 kV

Example → X1 400 VAC / Y2 250 VAC


SubstitutionCan you substitute one class with another?

Class Substitution1

X1 Y1 or Y2

X2 X1, Y1, or Y2

Y2 Y1

Y1 None1Substitutions are of the same or higher voltage rating

X1


Outline



• Lead Styles


• Key Takeaways


Lead Styles

Straight Outside

Kink

Inside

Kink

Vertical / Inline

Kink


Lead Styles

Straight

Outside

Kink

Inside

Kink

Vertical / Inline

Kink

PCB Board


Lead StylesOutside vs Inside Kink

Outside

Kink

Inside

Kink

d

d

Space Issues Clearance Issues


Lead StylesStraight vs Vertical / Inline Kink

Straight Vertical / Inline

Kink

d

Side View Side View

Top View Top View


Construction


Outline


• Classification and Certification

• Lead Styles


• Key Takeaways


sdf

HIGH VOLTAGEC900 Safety Disc

Safety SMD

ER Safety Disc

Class and Voltage Ratings:

• X1 400 VAC / Y2 250 VAC

• X1 440 VAC / Y2 300 VAC

• X1 760 VAC / Y1 500 VAC

• X1 400 VAC / Y1 250 VAC

• X1 400 VAC / Y1 400 VAC

Class and Voltage Ratings

• X1 250 VAC / Y2 250 VAC

• X2 250 VAC

• Up to 5 kV Pulse Capable

• Industrial Grade

Case Sizes:

• 1808-2225

Lead Styles:

• Straight

• Outside

• Vertical

Class and Voltage Ratings:

• X1 440 VAC / Y2 250 VAC

• X1 440 VAC / Y2 300 VAC

• X1 760 VAC / Y1 500 VAC

Lead Styles:

• Straight

• Outside

• Vertical

AC, AS, AH ERO, ERK, ERP

KJ Safety DiscClass and Voltage Ratings:

• X1 440 VAC / Y1 400 VAC

• X1 400 VAC / Y1 250 VAC

Lead Styles:

• Straight

• Outside

• Vertical

KJN, KJY

COMING

SOON


Key Takeaways

• Interference suppression

• Certified to IEC-60384-14 specification

• Marking and Certificate

• KEMET offers both X and Y safety capacitors with a variety of lead styles

• Be on the look-out for Safety SMD


Thank You!!!Mark R. Laps

Technical Product Manager

Ceramic Business Group

KEMET Electronics

Cell Phone: +1-864-399-4879

Office Phone: +1-864-963-6383

www.kemet.com | [email protected]

Ceramic Safety Capacitors - Engineering Center

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