Operation
EL1904 31Version: 3.0.0
PE power contact
The power contact labelled PE can be used as a protective earth. For safety reasons this contact mates first
when plugging together, and can ground short-circuit currents of up to 125A.
Fig.12: PE power contact
CAUTION
Insulation tests
Note that, for reasons of electromagnetic compatibility, the PE contacts are capacitatively coupled to the
mounting rail. This may lead to incorrect results during insulation testing or to damage on the terminal (e.g.
disruptive discharge to the PE line during insulation testing of a consumer with a rated voltage of 230V).
For insulation testing, disconnect the PE supply line at the Bus Coupler or the Potential Supply Terminal! In
order to decouple further feed points for testing, these Power Feed Terminals can be released and pulled at
least 10mm from the group of terminals.
DANGER
Serious risk of injury!
The PE power contact must not be used for other potentials!
5.2.4.2 Overvoltage protection
If protection against overvoltage is necessary in your plant, provide a surge filter for the voltage supply to the
Bus Terminal blocks and the TwinSAFE terminals.
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