Line fuses and miniature circuit breakers
Line fuses and miniature circuit breakers are used for protecting the supply system cables. A motor circuit breaker can be used as an alternative. For fusing, use fuses, miniature circuit breakers, or motor circuit breakers with the following properties:
Type class | Prerequisite |
|---|---|
Fuses in utilization categories gL, gG | Nominal voltage ≥ nominal line voltage |
Miniature circuit breaker with characteristics B, C, D | Nominal voltage ≥ nominal line voltage |
Motor circuit breaker | Nominal voltage ≥ nominal line voltage |
Select the rated current of the fuse according to the table in chapter Recommended cross section for nominal operation.
If project planning is available, smaller rated currents may be selected for fusing:
- The effective current requirement for the application is determined in the SEW-Workbench. Select the rated current of the fusing at least 10% higher than the specification "Line supply: Calculated effective current".
- If a motor has already been assigned but no SEW-Workbench calculation is available, select the rated current of the fusing at least 10% higher than the nominal motor current.
For fusing, observe the country-specific and system-specific regulations and, if necessary, the notes in chapter "UL-compliant installation".
