1.They provide protection for the latest generation of string inverters.
Modern inverters operate at AC voltages of 800 V and more. This makes for smaller-section conductors, which in turn saves on valuable copper and reduces power losses. SIBA fuses are effective at preventing damage to modern equipment of this kind.
2.They therefore help reduce the BOS costs.
New inverters also cut down on the material and installation costs associated with BOS (balance of system = all the PV components apart from the panels). They achieve this because they can be fitted with more compact switches and control cabinets. And as they are significantly smaller in size the logistic costs are also lower. SIBA fuses therefore help cut investment and operating costs and so generate a better rate of return.