Varistor Voltage

The voltage between two terminals with the specified measuring current 1mA DC applied is called V1mA,The measurement shall be made as fast as possible to avoid heat affection. 
Test equipment; MYZ-3 type varistors three parameters tester

The usual tolerance on varistors voltage is±10%. 
K：±10%；
L：±15%。

Leakage current

In the standard test conditions, the maximum allowable DC voltage applied, the flow through the varistor current. Test equipment: MYZ-3 Varistor three parametric tester.

Leakage current within the specified rating.（μA）

Applied the pulse current waveform is 8/20μS to varistor, time interval is 2 minutes, twice applied the same direction, make the varistor voltage change rate within ± 10% of the maximum peak current test 
Test equipment; impulse generator storage oscilloscope MYZ-3 type varistors three parameters tester

After applied the maximum pulse current in this instruction: varistor voltage change rate≤±10%

The maximum energy within the varistors voltage change of ±10% when one impulse of 2ms or 10/1000μS is applied.
For the 2mS waveform：
J=2000*Ip* Vc*10-6
For the 10/1000μS waveform：
J=1391*Ip* Vc*10-6 
Where J -- Energy absorbed in joules.
      Ip -- Maximum let-through current in amps.
      Vc-- Measured clamping voltage in volts.
Test equipment; impulse generator storage oscilloscope MYZ-3 type varistors three parameters tester

After applied the maximum impact energy in this instruction: no appearance damage, varistor voltage change rate≤±10%

Applied to the varistor current waveform is 8/20μS pulse, time interval of 2 minutes, twice applied the same direction, so that the rate of varistor voltage change within ± 10% of the maximum peak current. Test equipment: pulse generator memory oscilloscope MYZ-3 Varistor three-parameter test set

After applied the maximum pulse current in this instruction: varistor voltage change rate≤±10%

Voltage temperature coefficient

The varistor voltage change rate of varistor's temperature from 25 ℃ to 85 ℃, showed as %/℃.

Test equipment: THS-A5P-150 constant temperature and humidity box varistor tester

≤-0.05 %/℃。

Rated Wattage

The maximum permissible power consumption under the temperature of 25℃

See specification tables

Typical value measured at 1Vrms and test frequency of 1kHz

Test equipment: CY 2646A-type capacity tester

Capacitance is less than the specified rating, details see specification tables.

Standard test condition Temperature：15℃-35℃;  Relative humidity：45%-75%;  Air pressure：86 Pa-106kPa .

After dipping the terminals to a depth of immersion 3.5-0.5 mm from the body in a soldering bath temperature 235℃±5℃ for 2± 0.5seconds, the terminal shall be visually examined.
Test equipment: Solder machine

Approximately 90% of the terminals shall be covered with solder uniformly.

After each lead shall be dipped into a solder bath having a temperature 350℃±10℃,to a point 2.0 to 2.5mm from the body of the unit. Using shielding. Board(t=1.5mm) ,be held there for specified time 5±0.5s and then be stored at room temperature and humidity for 1 to 2 hours. The change of V1mA and mechanical damages are examined.
Test equipment: Solder machine

ΔV1mA /V1mA≤±5%.

Solvent resistance of marking

Solvent: alcohol Rubbing material: cotton woolRecovery: 4hours.
Thereafter, visual examination and the change of V1mA shall be examined.

Legible marking.

Solvent:70±5% and F113+30±5% strange third mellow mixture，Solvent temperature:23+5℃，5±0.5Min.
Recovery:  4hours.
Thereafter, visual examination and the change of  V1mA  shall be examined.

No outstanding damage.
ΔV1mA /V1mA≤±5%.

Robustness of terminations Tensile Bending

After gradually applying the force specified below and keeping the unit fixed for ten seconds. The terminal shall be visually examined for and damage.

No outstanding damage.
ΔV1mA /V1mA≤±5%.

Pulse shape half sine acceleration:390 m/s2, pulse 4000±10times. Thereafter, visual examination and the change of V1mA shall be examined. Test equipment: Collision sets

No outstanding damage.

ΔV1mA /V1mA≤±5%.

Frequency range:10Hz--55Hz.
Amplitude: 0.75mm or 98 m/s whichever is the less severe.
Total duration: 6 hours .
Thereafter, visual examination and the change of  V1mA  shall be examined.
Test equipment: vibrating table

No outstanding damage.
ΔV1mA /V1mA≤±5%.

Impose the required flame on the side of varistor after fixed the varistor, 15s per cycle for 3 cycles.

Self-extinguishing within 15s for one and second cycles, self-extinguishing within 30s for 3rd cycle.

Pulse current life

Applied the pulse current waveform is 8/20μS in below table to varistor, interval is 10s for 10000 times, testing the varistor voltage after 1 hour to 2 hours under put in normal temperature.

Test equipment: pulse generator
MYZ type varistors three parameters tester

No outstanding damage.
ΔV1mA /V1mA≤±10%.

Rapid temperature changes

Placed varistor under 125 ℃ ± 2 ℃ environment for 1000 hours, taking out at room temperature for 1 hour, 4 hours then measure the varistor voltage and leakage current.

Test Equipment: 101-Ⅱ A drum wind oven
MYZ-3 Varistor three parametric tester.

No outstanding damage.
ΔV1mA /V1mA≤±5%.
Leakage current within the specified rating.

Placed varistor under -40℃±2℃ environment for 1000 hours, taking out at room temperature for 1 hour, 4 hours then measure the varistor voltage and leakage current.
Test equipment: THS-A5P-150 constant temperature and humidity box
MYZ-3 Varistor three parametric tester

No outstanding damage.
ΔV1mA /V1mA≤±5%.
Leakage current within the specified rating.

Placed varistor under -40℃±2℃ and Relative humidity 90%~95% environment for 1000 hours, taking out at room temperature for 1 hour, 4 hours then measure the varistor voltage and leakage current.
Test equipment: THS-A5P-150 constant temperature and humidity box
ADCS ac/dc life testing machine
MYZ-3-based varistor three-parameter test set

No outstanding damage.
ΔV1mA /V1mA≤±10%.
Leakage current within the specified rating.

Placed varistor under -40℃±2℃ and Relative humidity 90%~95% environment for 1000 hours, taking out at room temperature for 1 hour, 4 hours then measure the varistor voltage and leakage current.
Test equipment: THS-A5P-150 constant temperature and humidity box ADCS ac/dc life testing machine
Test equipment: THS-A5P-150 constant temperature and humidity box ADCS ac/dc life testing machine
MYZ-3 Varistor three parametric tester

No outstanding damage.
ΔV1mA /V1mA≤±10%.
Leakage current within the specified rating.

Placed varistor under -85℃±2℃ environment for 1000 hours, and impose the maximun clamping AC voltage accordingly, power 90 minutes, off 30 minutes, taking out at room temperature for 1 hour, 4 hours then measure the varistor voltage and leakage current.
Test Equipment: 101-Ⅱ A drum wind oven
ADCS ac/dc life testing machine
MYZ-3 Varistor three parametric tester

No outstanding damage.
ΔV1mA /V1mA≤±10%.
Voltage rate of change ≤ ± 20%.

Dry heat: +85 ℃ ± 2 ℃, 16 hours;
Cycle heat: IEC68-2-30 test Db, 55 ℃, a cycle of 24 hours; cold: -40 ℃ ± 3 ℃, 2 hours;
Cycle heat: IEC68-2-30 Test Db rest cycle.
Measuring varistor voltage after take out at room temperature for 1 hour, 24 hours

No outstanding damage.
ΔV1mA /V1mA≤±5%.

V1mA
(v)

ACrms
(v)

DC
(v)

Vc
(v)

Ip
(A)

10/1000
μS

2ms

1time(kA)
(kA)

2times 
(kA)

(W)

1kHz
( pF)

UL

CSA

VDE

CQC