Line fuses
Motor circuit breakers, miniature circuit breakers and fuses are used for fusing the supply system cable. In case of a fault, these components additionally protect against short-circuits.
Observe the following information:
- Use the following components:
Input fuses | Prerequisite |
|---|---|
Motor circuit breaker | Nominal voltage of the motor circuit breaker greater than nominal line voltage. Nominal current of the motor circuit breaker must be set 10% above the nominal line current. |
Miniature circuit breaker with characteristics B, C, D | Nominal miniature circuit breaker voltage ≥ nominal line voltage |
Nominal current of the miniature circuit breaker must be 10% higher than the nominal line current. | |
Fuses | Fusing voltage ≥ nominal line voltage |
- Install safety devices at the beginning of the supply system cable for line protection. For further information, refer to chapter Wiring diagrams.
- Dimension the safety equipment according to the cable cross section.
- The PE impedance must comply with the normative specifications.
- Adhere to country- and system-specific regulations regarding the fusing.
