• 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 IEC 60947-2.
Selecting the main contactor (breaker)
￭ Cabinet-installed multidrives
Depending on the drive size, you can order it either with a main contactor (option +F250),
or a main breaker (option +F255).
￭ Multidrive modules
You can order a pre-selected main contactor (breaker) from ABB. See the appropriate drive
or supply module hardware manual.
Obey these guidelines when you select a customer-defined main contactor:
• Dimension the contactor according to the nominal voltage and current of the drive. Also
consider the environmental conditions such as ambient temperature.
• Select contactor with utilization category AC-1 (number of operations under load)
according to IEC 60947-4, Low-voltage switch gear and control gear.
• Consider the application life time requirements.
14 Electrical planning guidelines
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