DSH 587 Transformer intened to supply power to a saftey extra low voltage circui

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DSH 587 / U# y7 V6 \7 s

Transformer intened to supply power to a saftey extra low voltage circuit (SELV) " C" M& b, g6 T# V' c

24.1

60730-1(ed.3);am1 & ~, L5 B, o, T

+ m5 K6 ^. C. r9 z$ xQuestion:
Sub-clause 24.1 prescribes that “Transformers intended to supply power to a safety extra-low voltage
! h8 ]  ]; A2 Dcircuit (SELV) shall be of the safety isolating type and shall comply with the relevant requirements of
1 L. b) u6 S6 Y5 `IEC 61558-2-6.”.
This prescription does not allow the use of other types of transformers not covered by IEC 61558-2-6.
; f2 c2 v4 E# f0 ?In case of testing of an electronic control with an integrated switch mode power supply (SMPS)
intended to supply power to a safety extra low voltage circuit (SELV), what requirements shall be
applied?
! s0 f" B6 g+ N3 lDecision:
3 |; [, f, v- e) B; a( J) qThe transformer shall comply with the relevant requirements of IEC 61558-2-17 for safety relating
$ s! Y2 {5 x$ ]& ]" Dtransformers.
The entire switch mode power supply circuit (with the exception of the transformer) shall fulfil the
6 Y0 `1 v% y2 O" R. @0 i. arequirements of IEC 60730-1 and relevant Annex H.
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