Xiamen SET Electronics Co., Ltd.

TFV Series are comprised of varistor and thermal protection element. The TFV offer quick thermal response due to the close proximityof the intgraed thermal element to the MOV body. The integratedconfiguration also ofers lower inductance than most discrete solutions resulting in improved clamping performance to fast overvoltage transients.

V_N

Nominal Varistor  Voltage

Voltage, at specified d.c. current used as a reference point in the component characteristic.  

I_L

Leakage Current

Current passing through the varistor at the max. d.c. voltage, and at a temp. of 25 °C, or any other specified temp.

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. 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.

V_C

Clamping Voltage

Peak voltage developed across the varistor terminations under standard atmospheric conditions, when passing an 8/20 μs class current pulse.

Voltage Proof

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)

C_V

Capacitance

Capacitance across the MOV measured at a specified frequency and voltage.

V_ac

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. 

V_dc

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.

I_n

Nominal Discharge Current

Crest value of the current through the SPD having a current waveshape of 8/20 µs.

Imax

Max. Discharge Current

Crest value of a current through the SPD having an 8/20 µs waveshape and magnitude according to the manufacturers specification. Imax is equal to or greater than In.

Limited Current

Limited Current UL 1449

I_n

Nominal Discharge Current

Crest value of the current through the SPD having a current waveshape of 8/20 µs.

I_max

Nominal Discharge Current

Crest value of a current through the SPD having an 8/20 µs waveshape and magnitude according to the manufacturers specification. Imax is equal to or greater than In.

T_f

Rated Functioning Temp.

The Temp. of the TCO which causes it to change its state of conductivity with a detection current up to 10 mA as the only load.

Fusing Temp.

The Temp. of the TCO which causes it to change its state of conductivity with a detection current up to 10 mA as the only load. It is measured with a silicone oil bath in which the Temp. is increased at the rate of (0.5  - 1) °C /min.

Tolerance: T_f +0/-10 ℃(GB 9816, UL 60691, EN 60691, K60691 )

Tolerance: T_f ±7 ℃(J60691)

T_h

Holding Temp.

The Max. temp. of product body surface at which a TCO will not change its state of conductivity when conducting rated current for 168 h.

U_r

Rated Voltage

The voltage used to classify a TCO, which is the maximum voltage that TCO allows to carry and is able to cut off the circuit safely.

Through Hole

Radial

● Power Supplies

● Home Electrical Appliances    

● Industrial Devices

● Surge Protectors

● Telecom Devices 

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, Digital caliper, Salt Spray Tester, Universal Material Testing Machine, Spectrum Analyzer, etc.

Manufacturing Process

Online Inspection and Testing (Function 100% 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.

Resistance test system (100% Testing).

100% Visual inspection.

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 29 items of appearance requirements, electrical performance, mechanical performance, Soldering performance, environmental test and Material performance. e.g.

Voltage Protection Level Up Test.

Operating Duty Test.

High temperature and high humidity test

Tensile Test.

Solderability 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.

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Usage

1. Please do not apply severe vibration, shock or pressure to avoid surface resin or element cracking.

2. Please fix lead wires when bending or cutting. The distance between the bending point and the sealing of MOV shall be greater than 2mm.

3. In order to reduce the surface temperature rise, adding heat insulated shroud is recommended before wave soldering.

4. This curve is for reference only. Please confirm before production to avoid damaging the integrated Thermal Fuse.

Replacement

1. If varistor is visually damaged, please replace it.

2. Varistor is a non-repairable product. For safety sake, please use equivalent varistor for replacement.

Storage

1. Storage Temp. Range: (-40 to +125) °C

2. Relative Humidity : ≤75% RH

3. 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 not 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.

Please do not apply severe vibration, shock or pressure to MOV, to avoid surface resin or element cracking.

Application Examples

The application examples below show how the indicator lead on the TFV can be used to indicate that the thermal element has been opened. This signifies that the circuit is no longer protected from transients by the MOV.

1. In this case, the LED is normally on, and is off when the thermal element opens.

2. This circuit utilizes an optocoupler to provide galvanic isolations between the TFV varistor and the indicating or alarm circuitry.

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