Ametherm Ampron Panasonic Alternative Power NTC Thermistor 5 Ohm 40A

Ametherm Ampron Panasonic Alternative Power NTC Thermistor 5 Ohm 40A For Limiting Inrush Current

Overview Of The Power NTC Thermistor 5 Ohm 40A

R25(Ω): 0.2～20 Imax(A): 90A
[Product Features] Large current, long life, high reliability
[Product use] High-power switching power supply, conversion power supply, UPS power supply

Inrush current is the momentary surge of current created when power is turned on to motors,transformers,power suppliers and heating elements. The more power required by industrial equipment,the larger the inrush current. It can effectively quench the inrush current by means of in series with power NTC thermistor in return circuit of power supply. The thermistor’s resistance decreases dramatically following the inrush,allowing the steady state curent to flow with very little resistance.This effect provides inrush current protection, yet allows efficiency during normal operation.The power NTC Thermistor produced by Dongguan Ampfort Electronics Co.,Ltd. with large scale,especially MF73T,MF73,MF74,MF75 serial products with big size,which can be applied in such inrush protection with industrial level as industrial robots and automation.

Features Of The Power NTC Thermistor 5 Ohm 40A

● High power, strong ability to suppress inrush current.

● The material constant (B value) is large, the residual resistance is small, and its own power consumption is small.

● Large current, long life, high reliability.

● Easy to install the circuit board, complete series and wide application range.

Application Of The Power NTC Thermistor 5 Ohm 40A 

Nuclear magnetic resonance equipment, high-power audio power amplifier, high-power toroidal transformer.
Solar panel array of high-capacity power inverter.
Industrial robot driven by high voltage power supply.

Dimension Of The Power NTC Thermistor 5 Ohm 40A (mm)

Specificational Data Of The Power NTC Thermistor 5 Ohm 40A

Body diameter Φ40mm

Body diameter Φ45mm

Body diameter Φ50mm

What is the detection method of NTC thermistor?

NTC is a thermistor with a negative temperature coefficient, that is, the resistance becomes smaller as the temperature rises (in an exponential relationship).
When testing, use the multimeter ohm level (depending on the nominal resistance value to determine the level, generally R×1 level), the specific operation can be divided into two steps: first, the room temperature test (the indoor temperature is close to 25℃), and the alligator clip is used instead of the test pen to clamp. The actual resistance of the two pins of the PTC thermistor is measured and compared with the nominal resistance. The difference between the two is within ±2Ω, which is normal. If the actual resistance value differs too much from the nominal resistance value, it means that its performance is poor or damaged. Secondly, heating test. On the basis of normal temperature test, the second step of test—heating test can be performed. Place a heat source (such as an electric soldering iron) close to the thermistor to heat it, and observe the universal indicator. Seeing that the universal indicator changes with the increase of temperature, it indicates that the resistance value is gradually changing (the resistance of NTC thermistor with negative temperature coefficient will become smaller, and the resistance of PTC thermistor with positive temperature coefficient will become larger) , When the resistance value changes to a certain value, the displayed data will gradually stabilize, indicating that the thermistor is normal. If the resistance value does not change, it indicates that its performance has deteriorated and cannot be used continuously.

Pay attention to the following points when testing:
(1) Rt is measured by the manufacturer when the ambient temperature is 25℃, so when measuring Rt with a multimeter, it should also be carried out when the ambient temperature is close to 25℃ to ensure the reliability of the test.
(2) The measured power shall not exceed the specified value, so as to avoid the measurement error caused by the heating effect of the current. (3) Pay attention to correct operation. During the test, do not pinch the thermistor body with your hands to prevent the body temperature from affecting the test.
(4) Be careful not to put the heat source too close to the PTC thermistor or directly touch the thermistor to prevent it from being burned.