PARALLEL SOLUTIONS

PARALLEL CONNECTION OF FUSE-LINKS TO INCREASE THE RATED CURRENT

Rules for parallel connection of fuse-links:

• The fuse-links have to be the same type, size and rating.
• The combination of parallel fuses must be selected by the manufacturer.
• The current rating of parallel-connected fuse-links is lower than the sum of the single fuse-links (n x l_n > l_{n parallel}).
• The current distribution on all parallel fuse-links must be the same.
• Parallel fuse-links must be connected as prescribed by the manufacturer.
• The incoming and outgoing connection must have prescribed cross-section.
• The values of power dissipation are equal to the sum of values of power dissipation of a single fuse link.
• The pre-arcing Joule integral is approximately equal to n² x l²t_{(single fuse-link)}
• Breaking capacity is not larger than l1 of a single fuse-link.
• The cut-off current is approximately equal n x l_{cut-off (single fuse-link)}
• The temperature rise of each parallel fuse-links is higher than the temperature rise of single fuse-link.