LEYBOLD SCREWLINE SP 630 F Operating Instructions Manual page 56

Installation
Figure 17. Block diagram for the screw pump SP 630 F ATEX Category 2i/3o
7.6 Connecting the SP-Guard
WARNING: ELECTRIC HAZARD
Risk of damage to equipment. Ensure only such power supply units may be
connected which comply with the requirements of protective extra low voltage
with safe isolation in accordance with IEC 60364-4-41 (DIN VDE 0100-410) (PELV/
SELV).
In order to protect the 24 V power supply line of the SP-Guard, a suitable line
protector must be installed, for example, SITOP SELECT (6EP19612BA00) from the
company Siemens.
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