Technical Standards for Fuses
1. Rated zero power resistance
PPTC thermistors should be packaged according to zero power resistance levels, and the resistance range should be indicated on the outer packaging. After the withstand voltage and current resistance tests, the change rate of the resistance before each group of samples is extremely poor δ| After Ri - Before Ri - (After Rj - Before Rj)/Before Rj | ≤ 100%.
2. PTC effect
A material has a PTC (Positive Temperature Coefficient) effect, which means that the resistance of the material increases with increasing temperature. Most metal materials have the PTC effect. In these materials, the PTC effect is manifested as a linear increase in resistance with increasing temperature, which is commonly referred to as the linear PTC effect.
3. Nonlinear PTC effect
The material undergoing phase transformation will exhibit a phenomenon where the resistance rapidly increases by several to more than ten orders of magnitude along a narrow temperature range, known as the nonlinear PTC effect. Various types of conductive polymers exhibit this effect, such as polymer PTC thermistors. These conductive polymers are very useful for manufacturing overcurrent protection devices.
4. Initial resistance Rmin
Before being installed in the circuit, test the resistance value of the polymer PTC thermistor of the self resetting fuse series at an ambient temperature of 25℃.
5. Rmax
Under room temperature conditions, the self resetting fuse series polymer PTC thermistor acts or reflows.
The maximum resistance value is measured after one hour of installation in the circuit board.
6. Minimum resistance (Rmin)/maximum resistance (Rmax)
At a specified ambient temperature, such as 25℃, the resistance value of a specific model of self resetting fuse series polymer thermistor before installation in the circuit will be within a specified range, that is, between the minimum value (Rmin) and the maximum value (Rmax). This value is listed in the resistance column of the specification.
Fig.1
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