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SYS POWER SUPPLY UM E
Safe isolation
SELV
Safety Extra Low Voltage
PELV
Protective Extra Low
Voltage
According to DIN VDE 0106 Part 101, two circuits are safely isolated if there is an adequate
degree of certainty that the voltage of one circuit cannot affect the other circuit. This
includes a careful choice of the insulation, the use of safety transformers and complete
electrical isolation including the isolation of the closed-loop control circuit by optocouplers.
Primary switched-mode QUINT POWER, MINI POWER and STEP POWER power supply
units have been tested with regard to safe isolation according to DIN VDE 0100-410,
DIN VDE 0106-1010 and EN 61558-2-17.
DIN VDE 0555/EN 60742 deals with electrical safety of isolation transformers and safety
transformers with a rated frequency of more than 500 Hz.
Due to the system, primary switched-mode power supply units are not provided with a
transformer according to DIN VDE 0551 but with a transformer operating at a frequency of
40 kHz to 180 kHz. Because of these high frequencies transformers of primary switched-
mode power supply units cannot be tested according to DIN VDE 0551.
DIN VDE 0570-2-17/EN 61558-2-17 is a subsequent standard to DIN VDE 0551. It deals
with the safe isolation of transformers with an increased rated frequency and is used as a
basis for testing transformers of primary switched-mode power supply units.
Because the power supply units are safely isolated there is no need for expensive isolating
transformers in order to comply with DIN VDE 0551.
The Safety Extra Low Voltage (SELV) is always kept if, on the one hand, overspill of a
voltage from one circuit into another is prevented and, on the other hand, safety extra low
voltages with a nominal voltage of U N ≤ 50 V AC or 120 V DC are not exceeded.
For keeping the SELV, secondary grounding is permissible but not required.
For keeping the PELV, secondary grounding is absolutely necessary. Otherwise, the same
regulations apply as for keeping the SELV.
2-6
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