Part Number : FNR-10K471
Function : ZINC OXIDE VARISTOR
Package : Lead Type
Manufacutures : Fenghua (HK) Electronics ( www.fenghua.com )
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Description
Varistor voltage should be more than the operating voltage in over-voltage protective circuit The formula is shown as the following:
V1mA+a.v/b.c
a-power Voltage ripple coefficient usually take 1.2
v-DC Voltage (significant value only AC power)
b-Tolerance usually take 0.85
c-Ageing coefficient usually take 0.9
The calibrated Value is 1.5 times of DC voltage, the face value should be times of the calibrated value because of the peak voltage in alternating current power. Withstanding surge current In general, withstanding surge current is max. Pulse current value which determined by test conditions such as wave-shape, shock times and interval time etc, the change ratio of Varistor Voltage should be less than ±10% of the initial Value. The shock time is the function of wave – shape, amplitude and interval time ,when the amplitude decrease to 50% of the initial, it should be increased to 2 times of the initial in order to keep the life longer, the surge current which is absorbed by the varistor should be less than max. Withstanding surge current.
Specifications
FEATURES
Widely voltage range 18v-1.8kv
Fast response to the rapidly increase Voltage (Mu sec.)
Excellent non-linearity voltage
Symmetric V-1 characteristics
Great withstanding surge current (2000A/cm2)
