BRAND: All SETsafe | SETfuse products are derived from SETsafe | SETfuse’s own brand “SETsafe | SETfuse”
CUSTOMIZATION: Customers can customize Products, Technical Specifications and Circuit Protection Solutions at SETsafe | SETfuse (subject to communication between the two parties)
UPDATE: The information on SETsafe | SETfuse’s official website is the latest version, so feel free to purchase
All SETsafe | SETfuse products are derived from SETsafe | SETfuse’s own brand “SETsafe | SETfuse”.
CUSTOMIZATION:
Customers can customize Products, Technical Specifications and Circuit Protection Solutions at SETsafe | SETfuse (subject to communication between the two parties).
UPDATE:
The information on SETsafe | SETfuse’s official website is the latest version, so feel free to purchase.
TFMOV is a combination of varistors (MOV) and thermal protection component. Since varistor has the characteristics of aging or degrading; TFMOV can separate the varistor from the main circuitry by opening the thermal protection component when the varistor (MOV) degrades or fails. It is often used in which requires high reliability and weather withstanding, such as photovoltaic inverters, communication equipment, and power supplies in data centers, etc.
VN
Nominal Varistor Voltage
Voltage, at specified d.c. current used as a reference point in the component characteristic.
8/20 μs
8/20 Current Impulse
Current impulse with a nominal virtual front time of 8 µs and a nominal time to half-value of 20 µs.
— (IEC 61643-11)
1.2/50 μs
1.2/50 Voltage Impulse
Voltage impulse with a nominal virtual front time of 1.2 µs and a nominal time to half-value of 50 µs.
— (IEC 61643-11)
Uc
Maximum Continuous Operating Voltage
Maximum r.m.s. voltage, which may be continuously applied to the SPD's mode of protection.
— (IEC 61643-11)
In
Nominal Discharge Current
Crest value of the current through the SPD having a current waveshape of 8/20.
— (IEC 61643-11)
Iimp
Impulse Discharge Current for Class I Test
Crest value of a discharge current through the SPD with specified charge transfer Q and specified energy W/R in the specified time.
— (IEC 61643-11)
Imax
Maximum Discharge Current
Crest value of a current through the SPD having an 8/20 waveshape and magnitude according to the manufacturers specification. Imax is equal to or greater than In.
— (IEC 61643-11)
VC
Clamping Voltage
Peak voltage developed across the varistor terminations under standard atmospheric conditions, when passing an 8/20 class current pulse.
CV
Capacitance
Capacitance across the MOV measured at a specified frequency and voltage.
Modes of protection
An intended current path, between terminals that contains protective components, e.g. line-to-line, line-to-earth, line-to-neutral, neutral-to-earth.
— (IEC 61643-11)
Up
Voltage Protection Level
Maximum voltage to be expected at the SPD terminals due to an impulse stress with defined voltage steepness and an impulse stress with a discharge current with given amplitude and wave shape.
— (IEC 61643-11)
TCO
Thermal-Link
A non-resettable device incorporating a THERMAL ELEMENT which will open a circuit once only when exposed for a sufficient length of time to a temperature in excess of that for which it has been designed.
ATCO
Alloy Thermal-Link
Alloy Type Thermal-Link, Alloy is the thermal element.
Through Hole
Solder Pin
● Telecom Equipment
● String Inverter in Photovoltaic System
● AC / DC Power Supply
● Uninterruptable Power Supply (UPS)
● Surge Protective Device (SPD)
● Electric Meter
● Power Distribution Unit (PDU)
View Product Structure, Principle, Application Video
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.
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.
Including 29 items of appearance requirements, electrical performance, mechanical performance, Soldering performance, environmental test and Material performance. e.g.
2. The voltage applied continuously to the TFMOV can not exceed its maximum continuous operating voltage Uc.
3. When atmosphere press is from 80 kPa to 106 kPa, the related altitude shall be from 2000 meters to - 500 meters.
4. Do not touch the product body or pins directly when power is on, to avoid electric shock.
5. Do not clean the TFMOV with strong polar solvent such as ketone, esters, benzene, halogenated hydrocarbon, to avoid damaging the enclosure.
6. It should have a reliable grounding when using these products.
Replacement
TFMOV is a non-repairable product. For safety sake, please use equivalent TFMOV for replacement.
Storage
Do not store TFMOV at high temperature, high humidity or corrosive gas environment. To avoid reducing the solderability of the pins, please use them up within 1 year after receiving the goods.
Installation Position
Do not install the TFMOV on a place that may often suffer severe continuous vibration.
Mechanical Stress
Do not take violent action such as knocking when assembling to avoid mechanical damage.
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For more information, please contact SETsafe | SETfuse: sales@SETfuse.com.
ABSTRACT
According to the working principle and failure mode of varistor, this paper will explain the disadvantage of only overcurrent protection against MOV’s failure. At the same time, the best protection mode –Thermal protection is promoted.
Over Temperature Protection（85）
Over Voltage Protection（232）
Over Current Protection（59）
Active Protection（18）
Accessories（3）
