2 Engineering
2.3 Safety and switching
42 DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com
2.3 Safety and switching
2.3.1 Disconnecting device
In the European Union, this disconnecting device must be one of the
following devices in order to comply with European Directives as per
standard EN 60204-1, "Safety of machinery":
• An AC-23B utilization category disconnector (EN 60947-3)
• A disconnector with an auxiliary contact that in all cases will disconnect
the load circuit before the disconnector’s main contacts open
(EN 60947-3)
• A circuit-breaker designed to disconnect the circuit as per EN 60947-2
In all other regions, the applicable national and local safety regulations must
be complied with.
2.3.2 Fuses
The DA1 variable frequency drive and the corresponding supply cables must
be protected from thermal overload and short-circuits.
The fuses will protect the supply cable in the event of a short-circuit, limit any
damage to the variable frequency drive, and prevent damage to upstream
devices in the event of a short-circuit in the variable frequency drive.
￫
Install a manual disconnecting device between the mains
connection and the DA1 variable frequency drive. This
disconnecting device must be designed in such a way that it can
be interlocked in its open position for installation and
maintenance work.
￫
The fuse ratings and cable cross-sectional areas (wire gauges)
for the connection on the mains side will depend on the DA1
variable frequency drive’s input current I
LN
.
￫
For the recommended fuse sizing and assignments, please
refer to Section 6.5, „Fuses“, page 164.
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