Connecting up
SCALANCE MUM856-1
Operating Instructions, 08/2021, C79000-G8976-C628-02
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Safety notices on use in hazardous areas
General safety notices relating to protection against explosion
WARNING
EXPLOSION HAZARD
Do not press the reset button if there is a potentially explosive atmosphere.
WARNING
EXPLOSION HAZARD
Do not connect or disconnect cables to or from the device when a flammable or
combustible atmosphere is present.
Safety notices for use according to ATEX and IECEx
If you use the device under ATEX or IECEx conditions you must also keep to the following
safety notices in addition to the general safety notices for protection against explosion:
WARNING
Transient overvoltages
Take measures to prevent transient overvoltages of more than 40% of the rated voltage (or
more than 119 V). This is the case if you only operate devices with SELV (safety extra-low
voltage).
General notes on use in hazardous areas according to UL-HazLoc
WARNING
WARNING - EXPLOSION HAZARD -
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE UNLESS AREA IS KNOWN TO BE NON-
HAZARDOUS.
WARNING
Restricted area of application
This equipment is suitable for use in Class I, Division 2, Groups A, B, C and D or non-
hazardous locations only.
WARNING
Restricted area of application
This equipment is suitable for use in Class I, Zone 2, Group IIC or non-hazardous locations
only.