ZINC OXIDE VARISTOR
Description
FENGHUA
ZINC OXIDE VARISTOR
Fenghua (HK) Electronics Ltd.
Unit 207, Fu Hang Industrial Building, No.
1, Hok Yuen Street East, Hung Hom, Hong Kong Tel: 852-2408-7636 Fax: 852-2408-8859 Email: info@fenghua.
com URL: www.
fenghua.
com
ZINC OXIDE VARISTOR
FEATURES
z z z z z 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)
HOW TO ORDER
F Series Code F NR Non-Linear Resistor NR 05 Element Diameter (mm) 05 5 40 40 K Tolerance K M ±10% ±20% 180 Varistor (V) 180=18x10 1 181=18x10 2 182=18x10
0
T bulk dimensions (leave blank) T Bulk Tape & Reel
CHARACTERISTICS
TEST CONDITION
Item Operating Temperature Range Storage Temperature Range Varistor Voltage Max Clamping Voltage Energy Max Withstanding Surge Current Test Methods -40°C~+85°C -40°C~+125°C Element Diameter<5mm Test Current 0.
1mA(DC) Element Diameter≥5mm Test Current 1mA(DC) Current Wave shape 8x20μs Current input of Rectangular Wave Current Wave shape 8x20μs
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ZINC OXIDE VARISTOR
ZINC OXIDE VARISTOR SELECTION (ONLY REFERENCE)
Varistor voltage 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 current power.
Withstanding surge current
times of the calibrated value because of the peak voltage in alternating
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 th...
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