Xiamen SET Electronics Co., Ltd.
Metal Oxide Varistor (MOV) is a nonlinear resistance component with zinc oxide (ZnO) as its main constituent. The resistance of an MOV is sensitive to changes in the applied voltage. Below the threshold voltage, the MOV exhibits high resistance, allowing only a negligibly small leakage current to flow. Once the threshold voltage is exceeded, the resistance of the MOV drops sharply, enabling the conduction of a large current. This characteristic makes the MOV suitable for detecting and suppressing surge voltage and overvoltage, thereby protecting the circuit from damage caused by excessive voltage.
The Metal Oxide Varistor (MOV) finds wide application in various fields such as photovoltaics, communication, lightning protection, power supply, and power strips. It serves to suppress transient overvoltage and absorb surge energy within the circuit.
SETsafe | SETfuse offers Metal Oxide Varistors (MOV) with maximum peak current ratings ranging from 0.75 kA to 70 kA, and maximum continuous voltage ratings from 14 VAC to 750 VAC. These MOVs are equipped with safety certifications such as UL, cUL, TUV, and CQC, and comply with RoHS and REACH requirements.
VN
Nominal Varistor Voltage
Voltage, at specified d.c. current used as a reference point in the component characteristic.
IL
Leakage Current
Measuring at 75% of varistor voltage
UCT
Upper Category Temp.
Max. ambient temp. for which a varistor has been designed to operate continuously.
LCT
Lower Category Temp.
Minimum ambient temp. at which a varistor has been designed to operate continuously.
Max. Peak Current
Max. current per pulse, which may be passed by a varistor at an ambient temp. of 25 °C, for a given number of pulses.
VC
Clamping Voltage
Peak voltage developed across the varistor terminations under standard atmospheric conditions, when passing an 8/20 μs class current pulse.
Voltage Proof
Max. peak voltage, which may be applied under continuous operating conditions between the varistor terminations and any conducting mounting surface. (Applicable only to insulated varistors)
CV
Capacitance
Capacitance across the MOV measured at a specified frequency and voltage.
Vac
Max. Continuous a.c. Voltage
Max. a.c. r.m.s. voltage of a substantially sinusoidal waveform (less than 5% total harmonic distortion) which can be applied to the component under continuous operating conditions at 25 °C.
Vdc
Max. Continuous d.c. Voltage
Max. d.c. voltage (with less than 5% ripple) which can be applied to the component under continuous operating conditions at an ambient temp. of 25 °C.
● Power Supplies
● Home Electrical Appliances
● Industrial Devices
● Surge Protectors
● Telecom Devices
● Charging pile Rail transit vehicle electronics robot
● Smart grid Industrial control equipment Security
● Military industry aerospace illumination
SETsafe | SETfuse Quality Policy
Provide Industry-Leading Products
Raw-materials Supplier
Select critical raw materials: Must be from a manufacturer with quality management system (ISO9001, IATF16949) certification.
Annual or Quarterly Audits.
IQC (Incoming Quality Check)
AQL(MIL-STD-105E), Dimensions, Function, Visual Inspection, RoHS & REACH Test.
Document
Formulate corresponding incoming inspection specifications (01-QA-06-xxx) for each key material according to design data such as material technical indicators.
Testing Equipment and Tools
Projector, Tool Microscope, Salt Spray Tester, Universal Material Testing Machine, Spectrum Analyzer, etc.
Manufacturing Process
Online Inspection and Testing (Function 100% Automatic Testing).
Document
Process Flow Chart.
Failure Mode and Effects Analysis (FMEA).
Quality Control Flow Chart (QCFC).
Standard Inspection Procedure (SIP).
Work Instruction (WI).
Online Testing and Inspection
Static three-parameter detection system.
Visual inspection system for product appearance.
etc.
IPQC (In Process Quality Control) Inspection
AQL(MIL-STD-105E), Dimensions Inspection, Function Test, Visual Inspection.
FQC ( Final Quality Control)
AQL(MIL-STD-105E), Dimensions Inspection, Function Test, Visual Inspection, RoHS & REACH Test.
Reliability Test
Test specification (01-TE-01-xxx).
Including 28 items of electrical performance, mechanical performance, soldering performance, environmental test and life test, e.g.
Varistor Voltage Test.
Leakage Current Test.
Surge Test.
Climatic Sequence Test.
Rapid Change of Temp. Test.
Endurance at Upper Category Temp. Test.
etc.
OQC (Outgoing Quality Control)
AQL(MIL-STD-105E), Packaging, Labeling, Quantity Inspection.
Agency
Agency (Safety Certificate) Annual, Quarterly Audits.
Management System
ISO9001, (TUV approved and issued certificate).
ISO14001, ISO45001, etc.
Click to view the certificate
Environmental
RoHS & REACH Compliant.
SETsafe | SETfuse
Usage
1. Varistor must operated in the specified ambient temp.
2. Do not clean the varistor with strong polar solvent such as ketone, esters, benzene and halogenated hydrocarbon.
3. Please do not apply severe vibration, shock or pressure to MOV.
4. Please fix lead wires when bending or cutting. The distance between the bending point and the sealing of MOV shall be greater than 2 mm.
Replacement
If varistor is visually damaged,please replace it.
Storage
1. Storage Temp. Range: (-40 to +125) °C
2. Relative Humidity : ≤75% RH
3. Height Above Sea Level :< 2000 m
Do not store the MOV at the high temp., high humidity or corrosive gas environment, to avoid influencing the solder-ability of the lead wires, the product shall be used up within 1 year after receiving the goods.
Environmental Conditions
1. Varistor should neither be exposed to the open air, nor direct sunshine.
2. Varistor should avoid rain, water vapor or other condition of high temp. and high humidity.
3. Varistor should avoid sand dust, salt spray, or other harmful gases.
Max. Typical Capacitance of Varistor
The typical capacitance of varistor is listed in the specifications. Designers may refer to it when designing MOV in high frequency circuit.
Installation
Mechanical Stress
Do not knock MOV when installing, to avoid mechanical damage.
Soldering Parameters
Wave Soldering Parameters
The wave soldering parameters are for reference only. When MOV is for practice use, some related validation is recommended.
Metal Oxide Varistor(MOV) Catalog
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Over Temperature Protection（80）
Over Voltage Protection（228）
Over Current Protection（51）
Active Protection（16）
Accessories（2）
