GENERAL INFORMATION of Type 1-Voltage Limited Type Surge Protective Device(SPD)
l Varistor surge protective device (AC SPD)
l Large discharge energy.
l No leakage and no follow current.
l Applied to surge protection at the first stage of the power supply system.
l Strong environmental resistance.
l DIN rail installation.
Surge protection devices (SPD) and surge arresters have the same function: they can protect electrical equipment from overvoltage conditions, but what is the difference between them? The following is a brief description of the differences between them. 1. Different Rated Voltages: According to NEC 2017 Sec 280 & 285, the rated voltage of the surge […]
In an electrical systems, SPDs are usually installed in tap-off configuration (in parallel) between the live conductors and the earth. The operating principle of SPD can be similar to that of a circuit breaker. In normal use (no overvoltage): the SPD is similar to an open circuit breaker. When there is an overvoltage: the SPD […]
Connections of a SPD to the loads should be as short as possible in order to reduce the value of the voltage protection level (installed Up) on the terminals of the protected equipment. The total length of SPD connections to the network and the earth terminal block should not exceed 50 cm. One of the […]
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