Siemens SIVACON User Manual

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

Siemens SIVACON Specifications

General

Type	Low-voltage switchgear and controlgear assembly
Modular design	Yes
Form of internal separation	Up to Form 4b
Standards	IEC 61439-1/-2
Installation type	Fixed or withdrawable