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In some cases, the grounding terminal block may not provide a secure grounding connection to the DIN rail. This may cause an open circuit between the terminal block and the DIN rail. Wires or cables attached to the terminal block may not be grounded, leaving parts of the device energized. This may create a shock hazard due to the possibility of improper grounding.
For more information: Weidmuller's Product Safety Advisory on WPE 2.5 / WPE 4.