Protecting the drive, input power cable, motor and motor cable in short-
circuit situations and against thermal overload
Protecting the drive and input power cable in short-circuit situations
Arrange the protection according to the following guidelines.
1) Size the fuses according to instructions given in chapter Technical data on page 137. The fuses 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.
2) Circuit breakers which have been tested by ABB with the ACS150 can be used. Fuses must be used
with other circuit breakers. Contact your local ABB representative for the approved breaker types and
supply network characteristics.
The protective characteristics of circuit breakers depend on the type, construction and settings of the
breakers. There are also limitations pertaining to the short-circuit capacity of the supply network.
WARNING! Due to the inherent operating principle and construction of circuit
breakers, independent of the manufacturer, hot ionized gases may escape from the
breaker enclosure in case of a short circuit. To ensure safe use, special attention
must be paid to the installation and placement of the breakers. Follow the
manufacturer’s instructions.
Protecting the motor and motor cable in short-circuit situations
The drive protects the motor and motor cable in a short-circuit situation when the
motor cable is dimensioned according to the nominal current of the drive. No
additional protection devices are needed.
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