Surge protector electrical performance requirements   1. Prevent direct contact When the maximum continuous working voltage Uc of the accessible surge protector is higher than the ac rms value of 50V, these shall meet the following requirements. To prevent direct contact (inaccessible conductive parts), the surge protector shall be designed so that its live parts cannot be touched when installed under normal conditions of use. In addition to the surge protector being classified as inaccessible, the surge protector shall be designed so that, when installed and wired for normal use, live parts shall be inaccessible, even after dismantling parts that can be removed without tools. The connection between the ground terminal and all accessible parts connected to it shall be of low impedance. Compliance is checked by tests. 2. Residual current (residual current) I_PE For all surge protectors with PE terminals, the I_PE shall be measured with all terminals of the surge protector connected to the power supply of the reference test voltage (UREF) in accordance with the manufacturer's instructions Compliance is checked by a test, which is not applicable to SPDs connected only to N-PE. 3. Voltage protection level Up The limiting voltage of the surge protector should not exceed the voltage protection level specified by the manufacturer. Compliance is checked by tests. 4. Action load test When the maximum continuous working voltage Uc is applied, the surge protector shall be able to withstand the specified discharge current without unacceptable changes in its characteristics. In addition, the voltage switch-type surge protector or combined surge protector shall at least be able to cut off the freewheeling current of the dry rated short-circuit current I_SCCR. Compliance is checked by tests.

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Post time: Apr-20-2022