2 Engineering
2.3 Safety and switching
DA1 Variable Frequency Drives 11/16 MN04020005Z-EN www.eaton.com 45
2.3.5 Mains contactors
The mains contactor enables an operational switching on and off of the
supply voltage for the variable frequency drive and switching off in case of a
fault. The mains contactor is designed based on the mains-side input current
I
LN
of the DA1 variable frequency drive for utilization category AC-1
(IEC 60947) and the ambient air temperature at the location of use.
￫
The mains contactors listed here are based on the variable
frequency drive’s rated input-side mains current I
LN
without an
external mains choke.
The contactor should be selected based on thermal current
I
th
=I
e
(AC-1) at
the specified
ambient air temperature.
NOTICE
The inching operation is not permissible via the mains contactor
(Pause time 30 s between switching o and on).
￫
For UL-compliant installation and operation, the mains side
switching devices must allow for a 1.25 times higher input
current.
￫
For the rated mains contactors for DA1 variable frequency
drives, please refer to the technical data chapter in
Section 6.6, „Mains contactors“, page 168.
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