We applied for MOV certification, has not encountered because the product parameters are not complete, and asked to provide specifications or materials? Is there any reason why the test has been delayed because of the unreasonable parameter setting? You here to request the MOV parameter we offer the latest and most complete!
Take a look at the following example, these electrical parameters are necessary to provide oh!

Vr	MCOV	MLV	Vn	In	Ta
250VAC	265V	650V	390V	1.5kA	Max.85℃

Rated voltage (Vr): specify the voltage applied to the element. Can be V AC (50/60 Hz) or V dc.
Test correlation:
If the MOV claims to have insulation, the need to pass (1000V+ two times the maximum rated voltage) withstand voltage test. For example, the maximum rated voltage is 250V, it is necessary to withstand the pressure test 1500V.
Two, the maximum continuous working voltage (MCOV): allows the maximum value of the AC voltage applied to work continuously on the component. If the operating voltage exceeds MCOV, the MOV may fail.
Test correlation:
If the maximum ring temperature is above 85 DEG C, the 1000h burn-in test is going on! Aging test products need power, voltage is MCOV.
After each nominal discharge current test, the sample is applied in a second internal demand (MCOV) 60 sec; after the test of the nominal discharge current for the 15 time, the maximum continuous working voltage (MCOV) of the product is required to be applied to min ().
Three, the nominal discharge current In: plant products can be specified, the peak pulse current through the (test 15 times, the current waveform as below), current must be in the following parameters in 0.01, 0.05, 0.1, 0.15, 0.25, 0.5, 1, 1.5, 2, 2.5, 3, 5, 10 or 20 kA.
8/20 s current waveform Four, the measurement limit voltage (voltage) (MLV): when the pulse current provisions applied on the varistor when the peak voltage between the ends of leads. For the MOV, the pulse current is referred to here as the 8/20 US nominal discharge current wave.
Test correlation:
After the nominal discharge current test, the average value of MLV measured by the 3 samples is 4, and the average value of the MLV value is about 5. For example: 311V, 310V
Five, 1mA/0.1mA DC voltage sensitive (Vn): 1mA/0.1mA DC current, the voltage of MOV.
Test correlation:
The difference between the test value of the laboratory and the manufacturer‘s voltage sensitivity value should be less than 10%;
The MOV shall be tested in the following order and shall be met after testing:
90% initial Vn < repeat Vn < 110% initial Vn
1mA voltage sensitive voltage test.
1000 hours aging test (ring temperature above 85 DEG C).
Nominal discharge current test (In).
The repeated 1mA varistor voltage test.
Six, the maximum temperature of the ring (Ta): the manufacturer specified product normal working temperature.
Test correlation:
1, more than 85 DEG C products, the need for 1000h aging test.
2, the electrical parameters are set, and then provide the following information, UL certificate with extreme ease!
3, process diagram: 1mA voltage measurement must be included in the process diagram.
4, chip recipe ingredients.
5, the coating of UL plastic yellow card (plastic yellow card temperature should be greater than the maximum ambient temperature Oh!) Specification: the specification includes the above and below the size of the drawing of electrical parameters
A: pin diameter
D: uncoated chip diameter + tolerance
E: pin distance
H: uncoated chip thickness + tolerance
The distance from the edge of the chip to the edge of the plate
Coating thickness + tolerance
D: finished diameter
H: finished product thickness
L: coating height
M: pin length