Line fuses
Fuses and miniature circuit breakers are used for protecting the supply system cables. In case of a fault, these components additionally protect against short-circuits. For fusing, use fuses or miniature circuit breakers with the following properties:
Input fuses | Prerequisite |
|---|---|
Fuses | Fusing voltage ≥ rated line voltage |
Miniature circuit breaker with characteristics B, C, D | Nominal miniature circuit breaker voltage ≥ nominal line voltage |
Nominal currents of the miniature circuit breaker must be 10% higher than the nominal line current. |
Install safety equipment F11/F12/F13 for line fuses at the beginning of the supply system cable, see 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.
