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The choice of fuse is mainly based on the protection characteristics of the load and the size of the short-circuit current to select the type of fuse. For small-capacity motors and lighting branch lines, fuses are often used as overload and short-circuit protection, so the melting coefficient of the melt is expected to be appropriately small.
RQA series fuses of lead-tin alloy melt are usually selected. For larger-capacity motors and lighting trunks, short-circuit protection and breaking capacity should be considered emphatically. RM10 and RL1 series fuses with higher breaking capacity are usually selected; when the short-circuit current is large, RT0 and RTl2 series fuses with current limiting function should be used.
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