Dc fuse is a very easy to use protection facilities, when the abnormal circuit is often accompanied by rising current, the rising current will not only damage some key equipment, but also burn the circuit, cause a fire and directly cause great economic losses. After the DC fuse is installed, when the current exceeds the current value that the DC fuse can bear, the DC fuse will melt and break itself because of the heat generated by the excessive current, killing the danger in the bud and fully protecting the line from damage.
The internal structure of DC fuse is metal with low melting point. The whole parts are installed in series in the circuit. When the current in the circuit exceeds its rated value, it will be fused because of its own heating. Dc fuses have simple internal structure, convenient installation and obvious effect. They are widely used in various power systems and power facilities. Dc fuses are also installed in many people’s homes to protect home appliances from sudden damage.
Surge protective decives, also known as lightning arresters, are electronic device that provide safety protection for various electronic equipment, instrumentation, and communication lines. When a surge current or voltage is suddenly generated in an electrical circuit or communication lines due to external interference, thesurge protective decives can conduct the shunt in a very short period of […]
Operating voltage Uc Depending on the system earthing arrangement, the maximum continuous operating voltage Uc of SPD must be equal to or greater than the values shown in the table in Figure 1. Fig.1 – Stipulated minimum value of Uc for SPDs depending on the system earthing arrangement (based on Table 534.2 of the IEC […]
The components of a SPD The SPD chiefly consists of (see Fig.1): 1) one or more nonlinear components: the live part (varistor, gas discharge tube, etc.); 2) a thermal protective device (internal disconnector) which protects it from thermal runaway at end of life (SPD with varistor); 3) an indicator which indicates end of life of […]
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