Overcurrent / short circuit protection
7
7.1
Overcurrent / short circuit protection
HRC fuses or moulded case circuit breakers for short circuit protection have to be used. Short
circuit protection equipment and connection cable should be dimensioned to handle the 1.5
times rated current of the capacitor permanently.
• Selection of connection cables should be dimensioned according to handling of current (for
recommendations, refer to the appendix).
• HRC fuses do not protect the capacitor against overload. They are only a short circuit
protection!
• MCCBs and HRC fuse rating has to be 1,6 ... 1,8 times nominal capacitor current.
• Do not use HRC fuses for switching capacitors (lightning arc!).
• Use thermal / magnetic overcurrent relays for overload protection.
Installation and maintenance instructions for Power Factor Correction (PFC) capacitors
Installation Manual, 05/2022, L1V30884033A
27
