Classification of Fuses
Fuses are divided into two categories: high voltage and low voltage. High voltage fuses for 3kV-35kV; Low voltage fuses are used for AC 220V, 380V, and DC 220V, 440V.
High voltage fuses are divided into indoor and outdoor types, and the model description is as follows:
For example, RN1-3/150-200 is indoor. The rated voltage is 3kV, the rated current is 150A, and the breaking capacity is 200MVA.
Indoor models include RN1, RN2, RN3, RN5, RN6, etc., outdoor models include RW3, RW4, RW10, etc., and DC electric vehicles use RNZ, RNZ1, etc.
Low voltage fuses are commonly classified into three categories: plug-in, tubular, and spiral. It can also be divided into three types: open type, semi closed type, and closed type.
The open type is not used alone and is often combined with a knife switch; One or both ends of the semi enclosed tube are opened, and the molten particles are sprayed out in a certain direction. Please pay attention to safety when using; Closed type commonly includes plug-in type, unfilled tube type, filled tube type, and filled spiral type. The meaning of the letters for low-voltage fuses is as follows:
R-fuse; C-plug-in; L-spiral; M - Closed tube type; S-fast; T - Packed tube type. For example, RC1 and RC1A are plug-in; RM - unfilled tube type; RT0, RL1, and RLS are respectively filled tube type and filled spiral type.
Fig.1
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