SEP 09, 2005 revised to JUL 17, 2006

Page 10 of 12

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LOS, LOR, LOK4000 Series Data Sheet

DIN-Rail Mountable AC-DC (DC-DC) Converters

Under test conditions the leakage current flows through a

measuring instrument (MI) as described in fig. Measuring

instrument for earth leakage current tests, which takes into

account impedance and sensitivity of a person touching

accessible parts. The current value is calculated by dividing

the measured voltage by 500 W. If inputs and/or outputs of

LOS, LOR, or LOK models are connected in parallel, their

individual leakage currents are added.

Leakage Currents in AC-DC Operation

Leakage currents flow due to internal leakage capacitance and

RFI suppression Y-capacitors. The current values are

proportional to the mains voltage and nearly proportional to the

mains frequency and are specified at an input voltage of 264 V

(50 Hz) where phase, neutral and protective earth are correctly

connected as required for class I equipment.

Fig. 11

Measuring instrument (MI) for earth leakage current tests

according to IEC/EN 60950.

Table 11: Leakage currents

Characteristic

LOK

Unit

Maximum earth

Permissible according to IEC/EN 60950

3.5

mA

leakage current

Specified value at 264 V, 50 Hz

1.0

Maximum output

Permissible according to IEC/EN 60950

0.25

leakage current

Specified value at 264 V, 50 Hz

0.035

V

MI

500

Ω

1500

Ω

10 k

Ω 220 nF

22 nF

MI for

output

leakage

current

Vo+

Vo-

10053

MI for

earth

leakage

current

L

L

N

N

Fig. 12

Test setup.