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BCD20021-G Rev AF, 29 November 2021
Page 19 of 26
X Series
375, 500 Watt AC-DC and DC-DC DIN-Rail Converters
© 2021 Bel Power Solutions & Protection
Standards and Approvals
The X Series converters were approved according to UL/CSA 60950-1 and CE declaration according IEC/EN 62368-1.
The converters have been designed in accordance with said standards for:
• Class I equipment
• Power-supply for building-in, vertical mounting on 35 mm DIN-rail or on a wall
• Overvoltage category II (III for 110 VAC supply)
• Basic insulation between input and case, based on 250 VAC
• Double or reinforced insulation between input and output, based on 250 VAC and 350 VDC
• Functional insulation between outputs and case
• Functional insulation between outputs
• Pollution degree 2 environment
The converters are subject to manufacturing surveillance in accordance with the ISO 9001:2015.
See also the Declaration of Conformity (last page).
Railway Applications
The X Series converters have been designed by observing the railway standards EN 50155 and EN 50121. All boards are coated
with a protective lacquer.
Isolation
The electric strength test is performed in the factory as routine test in accordance with EN 62911 and IEC/EN 62368-1 and should
not be repeated in the field. The Company will not honor warranty claims resulting from incorrectly executed electric strength field
tests.
Table 14: Isolation
Characteristics
Input to Case
and Output(s)
Output(s) to Case
Output 1 to Output 2
and AUX
Unit
Electric strength test
Factory test ≥1 s
2.8
1
1.4
0.5
kVDC
AC test voltage equivalent
to factory test
2.0
1.0
0.35
kVAC
Insulation resistance
>300
2
>300
2
>100
M
Ω
1
Subassemblies are pretested with 4.2 kVDC.
2
Tested at 500 VDC.
Leakage Currents
Leakage currents flow due to internal leakage capacitance (mainly the Y-capacitors). The current values are proportional to the
voltage
V
i
and the frequency
f
i
of the supply (mains). The leakage currents are specified at maximum operating input voltage,
provided that phase, neutral, and protective earth are correctly connected as required for class I equipment.
Caution:
Leakage current may exceed 5 mA, if
f
i
> 63 Hz.
Safety of Operator-Accessible Output Circuits
If the output circuit of a converter is operator-accessible, it shall be a ES1 circuit according to the safety standards IEC/EN 62368-1
3rd edition.
The converters have ES1 output circuits up to an output voltage of 57.5 V. However, if the isolated outputs are connected to
another voltage source or connected in series with a total of >57.5 V, the outputs are hazardous.
LED Indicator
A green LED is activated, when the output voltage
V
o
is within the normal operating tolerance band.
Note:
This LED is also activated, when the converter is not powered by the input, but a loaded battery is connected to the output.
