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EU
To meet the European Union Directives, according to standard EN 60204-1, Safety
of Machinery, the disconnecting device must be one of the following types:
• a switch-disconnector of utilization category AC-23B (EN 60947-3)
• a disconnector that has an auxiliary contact that in all cases causes switching
devices to break the load circuit before the opening of the main contacts of the
disconnector (EN 60947-3)
• a circuit breaker suitable for isolation in accordance with EN 60947-2.
US
The disconnecting means must conform to the applicable safety regulations.
Fuses
See section
Thermal overload and short-circuit protection
The drive protects itself and the input and motor cables against thermal overload
when the cables are dimensioned according to the nominal current of the drive. No
additional thermal protection devices are needed.
WARNING! If the drive is connected to multiple motors, a separate thermal overload
switch or a circuit breaker must be used for protecting each cable and motor. These
devices may require a separate fuse to cut off the short-circuit current.
The drive protects the motor cable and the motor in a short-circuit situation when the
motor cable is dimensioned according to the nominal current of the drive.
Mains cable (AC line cable) short-circuit protection
Always protect the input cable with fuses. Size the fuses according to local safety
regulations, appropriate input voltage and the rated current of the drive (see
Technical Data).
ACS800-01/U1, ACS800-02/U2 without enclosure extension and ACS800-04/U4
When placed at the distribution board, standard gG (US: CC or T for the ACS800-
U1; T or L for the ACS800-U2 and the ACS800-U4) fuses will protect the input cable
in short-circuit situations, restrict drive damage and prevent damage to adjoining
equipment in case of a short-circuit inside the drive.
Thermal overload and short-circuit
protection.
Planning the electrical installation
31
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