ABB 630 series, Installation Manual

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Safety information
Dangerous voltages can occur on the connectors, even though the
auxiliary voltage has been disconnected.
Non-observance can result in death, personal injury or substantial
property damage.
Only a competent electrician is allowed to carry out the electrical
installation.
National and local electrical safety regulations must always be
followed.
The frame of the IED has to be carefully earthed.
Whenever changes are made in the IED, measures should be taken
to avoid inadvertent tripping.
The IED contains components which are sensitive to electrostatic
discharge. Unnecessary touching of electronic components must
therefore be avoided.