From pv magazine France.
French electrical protection, control products and power management specialist Mersen has launched a range of fuses and equipment for photovoltaic systems with 1500 V DC/800 V AC inverters.
“Today, more and more new photovoltaic systems are using string inverter solutions without DC fuses,” the company stated.
The manufacturer has raised the AC output voltage of the inverters to 800 V to reduce product cost and power losses. The new solution requires 800 V AC protection in AC combination boxes which group string inverters. “The optimal protection at this voltage level is the combination of NH fuses with NH fuse switch-disconnectors: this is the only integrated solution to protect, isolate and switch the circuit,” said Mersen.
The manufacturer is also offering 800 V AC fuses which can interrupt current overload – and a breaking current of up to 90 kA – at a tested voltage of 880 V.
“Mersen is now the only manufacturer to offer a complete set of NH fuses and NH fuse switch-disconnectors designed specifically to meet the protection and distribution requirements of power grids on the AC side of new string inverters with a nominal operating voltage of 800 V AC,” added the company. “This new offer includes NH fuses and NH fuse switch-disconnectors, in [an] horizontal version (Multibloc) and vertical version (Multivert).”
Mersen offers NH 800V AC fuses of 50-160 A (size 1) and 200-250 A (size 2) and blocks compatible with size 1 in its Multivert range, and with both in its Multibloc range.
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