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Table 3

sub classes	peak impulse voltage in service	application	IEC 60664 installation category	peak impulse voltage Up applied before endurance test
X1	＞2.5KV ≦4.0KV	high pulse application	III	for C≦1.0μF : Up=4.0KV for C＞1.0μF : Up=(4 /√C ) KV
X2	≦2.5KV	general purpose	II	for C≦1.0μF : Up=2.5KV for C＞1.0μF : Up=(2.5 /√C ) KV
X3	≦1.2KV	general purpose	-	none

e) Class Y capacitors are suitable for applications where the breakdown of the capacitor can lead to a
dangerous electric shock. Class Y capacitors are subdivided into the 4 subclasses (See the Table 4)

Table 4

sub classes	type of insulation bridged		range of reted voltage	peak impulse voltage before endurance test
Y1	double insulation or reinforced insulation		≦250V	8.0KV
Y2	basic insulation or supplementary insulation		≧150V ≦250V	5.0KV
Y3	basic insulation or supplementary insulation		≧150V ≦250V	none
Y4	basic insulation or supplementary insulation		＜150V	2.5KV

f)World-wide safety standard approval for interference suppressors capacitors
(See the Table 5)

Table 4

Series Type

Capacitance
Range
(μF)

Rated
Voltage
(Vac)

Operating
Temperature
°C

Safety Class

Climatic Category

Brand

Safety approvals

UL

CSA

VDE

FI

ENEC

EK

CQC

CE

MPX

001～1.0

275

-40 ~ +110

X2

40/
110/21/C

DAIN

●

●

●

●

●

●

●

●

MPX

0047～6.8

275

-40 ~ +110

X2

40/ 110/56/B

ETR

●

●

●

●

○

○

●

MPX

.0047～6.8

275

-40 ~ +100

X1

40/ 100/21/C

ETR

●

●

●

●

●

●

●

Approvals in use = ●，Approvals in pending = ○


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