SPMZC Intelligent PTCR 300R 105C 290V NTC PTC Thermistors For Energy Saving Lamp

SPMZC Intelligent PTCR 300R 105C 290V NTC PTC Thermistors For Energy Saving Lamp

Product Details:

Place of Origin: China
Brand Name: TIAN RUI
Certification: ROHS
Model Number: SPMZC

Payment & Shipping Terms:

Minimum Order Quantity: 1000pcs
Price: Negotiable
Packaging Details: PE bag, Bulk
Delivery Time: 5-7 work days
Payment Terms: T/T, Paypal, Mastercard, Wetern Union, Alipay, etc
Supply Ability: 1000000PCS per Month
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Detail Information

Part Name: SPMZC Intelligent PTCR PTC Thermistor Reference Temperature: 105±7℃
R25: 300Ω±50% Varistor Voltage: 290 ±10%
Max. Operating Voltage: 265V Diameter: 8.0mm
Lead Spacing: 5mm Coating: Silicon Resin
Color: Green Package: PE Bag
High Light:

105C NTC PTC Thermistors


290V NTC PTC Thermistors


300R PTCR Thermistor

Product Description


SPMZC Intelligent PTCR 300R 105C 290V PTC Thermistor For Energy Saving Lamp Starting





Sensors and components need keep improving with the demands of markets for higher and higher quality products. Our company introduced patent producing technology of intelligent PTCR to produce preheating-starting components of electronic ballasts and electronic energy-saving lamps ,which enormously increase the number of switching cycles and life of fluorescent lamps .At the same time ,they overcome temperature warmuping and energy wasting of normal PTCR after they preheated and started electronic ballasts or electronic energy-saving lamps. They enhance luminous flux ,lumen numbers and luminescence efficiency,so they are called another creative revolution of green illuminance electricities.

SPMZC Intelligent PTCR 300R 105C 290V NTC PTC Thermistors For Energy Saving Lamp 0



1. PTC and varistor composite;

2. No heat and no power consumption after the filament is warmed up;

3. Small size for easy installation;

4. Operating temperature range: -40 -- +125℃(V=Vmax);



Dimensional Drawing


Dimension: (mm)

SPMZC Intelligent PTCR PTC Thermistor 300R 105C 290V For Energy Saving Lamp Starting 1

□ No marking ■ SP729565


□Epoxy resin

■Silicon resin

□Phenolic resin









□Tinned Cu wire

■CP wire

□Tinned phosphor



□Side kink

□Outer kink

■Inner kink

Dmax F±1 hmax Lmin Φd±0.05 Hmax
8.0 5.0 16.5 20.0 0.60 6.0
Electrical performance
Item Technical requirement Test condition and method

Rated resistance



Temperature:25 ± 2 ℃,

Testing voltage≤1.5VDC;

Metering accuracy:± 0.5Ω

Reference temperature


105±7℃ The temperature corresponding to twice as rated current. Thermal conductivity of static dielectric is silicone oil or air, temperature precision ±0.5℃, temperature maintaining time ≥15min; temperature upgrade ≤30℃/h

Varistor Voltage


290 ±10%V


Ta: 25±2℃ Testing Current : 1.0mA






Intelligent power-free PTC thermistors are used as preheating components for electronic ballasts and energy-saving lamps, which can greatly increase the switching times and service life of the lamp, and at the same time overcome the common PTC thermistor’s use in electronic ballasts and energy-saving lamps. After preheating, it has the disadvantages of temperature rise and power consumption, which improves the luminous flux, lumens and luminous efficiency of the lamp. Since there is no current passing through the PTC element during operation, no heat is generated, which is conducive to the stable operation of energy-saving lamps and electronic ballasts and a longer life.


Application Principle 

The intelligent power-free PTC thermistor is an intelligent component with composite functions, which is a combination of a varistor and a PTC thermistor. Taking advantage of the characteristics of high lamp starting voltage and low working voltage, a varistor with a working voltage higher than that of the lamp and lower than the starting voltage of the lamp is selected. When the lamp is started, the varistor is turned on and the current passes through the PTC element. The resistance value changes drastically and the lamp is lit. After the lamp is lit, the voltage drops to the normal working voltage. At this time, the varistor is turned off and no current passes through, so as to achieve the goal of zero power for the intelligent component.


Contact Details:

Andy Wu

Email: andy@tianrui-fuse.com.cn

Tel/Whatsapp: +86 13532772961

Wechat: HFeng0805

Skype: andywutechrich

QQ: 969828363

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