Current Limiting Thermistor NTC Chip Disc Inrush Current Limiter ICL 20D-20 20mm 5 Amp 20R For Power Supply Ballast 552

Brief Introduction

MF72 series NTC thermistor devices for limiting surge current are made of a specially formulated metal oxide ceramic material and in the form of radial resin coated that is capable of limiting high surge current.Applying power NTC thermistor in the power supply loop is the most simple, convenient and effective measure to restrain switch-on surge current and protect electronic equipment.

Main parameters and dimension

NTC Thermistor Application

1. Conversion power supply, switch power supply, UPS power
2. Power supply circuit, electronic circuit of equipments
3. Electric heater
4. Electronic ballast
5. Oscillight,display
6. Filament protection of bulb,electronic energy-saving lamps and other lighting lamps

Working principle

When turn on an electrical equipment,a prodigious surge current arises in the moment can be restrained effectively by a power NTC thermistor connected in series with the power circuits,which including a capacity,heater, motor.This inrush current lasts short, but its peak current is prodigious. It can even exceed 100 times of operating current in conversion power, switch power and UPS power.So limiting the surge currentmeasures must be took effectively.When current is applied on NTC thermistor directly, NTC resistance may decrease with the heating of NTC thermistor speedily. Power type NTC thermistor has a specified zero powerresistance, when it is in series in the circuit, it can restrain the switch-on surge current effectively. After it completes surge current limiting function, due to the current operation continuously, the resistance candecrease to very small value, its power consumption can be neglected, does not influence the normal operation current. Therefore, applying power NTC thermistor in the power supply loop is a most effectively and mostbrief measure to restrain surge current,protecting electrical equipment from destruction.
Be noticed, the NTC thermistor can not be used in parallel in the circuit since one unit will tend to conduct all the current available nearly.

Main parameter:

Zero Power Resistance Value R25(Ω)
Maximum stable current I(A)
Approximate resistance in maximum current(Ω)
Thermal time constant(S)
Dissipation factor (mW/ ℃)
Operating temperature range -55~+200 ℃

Advantages

MF72 series thermistors are used for limiting the Inrush Current in the power supply loop of every kinds of power supply, ballast / CFL etc. and the heating loop of CRT of color TV / monitor, heater, filament etc.

The MF72 series thermistors is the radial leads resin coating type products, it has the characteristic of small bulk, high power, strong limiting of inrush current, quick response, long life, high reliability, etc.

The temperature is decreased while the Material Consistent(B) of thermisters is increasing and the Remain Resistance is decreasing. The higher is the Thermal Capacity, the stronger is the capability of limiting the Inrush Current. It is direct proportion to the product of the Thermal Time Constant (T) and Thermal Dissipation Constant (d) .

​The MF72 series thermistors has so wide application area, which is mainly used in Switching Power Supply, UPS Power Supply, CFL, Ballast, Circuitry of Power Supply, etc.