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
- +1 Like
- Add to Favorites
Recommend
- The Difference between Self Recovery Fuse and Blown Fuse
- Self Recovery Performance and Working Process of Self Recovery Fuses
- Guidelines for Selecting Self Restoring Fuses and Disposable Fuses
- Self Restoring Fuses for Overcurrent Protection of Explosion-proof Lamps
- Professional Knowledge of Self-healing Fuses
- Parameters of Self Restoring Fuses
- What are the Standard Requirements for Self Restory Fuse Technology?
- What is the Function of Patch Self Recovery Fuses
This document is provided by Sekorm Platform for VIP exclusive service. The copyright is owned by Sekorm. Without authorization, any medias, websites or individual are not allowed to reprint. When authorizing the reprint, the link of www.sekorm.com must be indicated.
Integrated Circuits
Discrete Components
Connectors & Structural Components
Assembly UnitModules & Accessories
Power Supplies & Power Modules
Electronic Materials
Instrumentation & Test Kit
Electrical Tools & Materials
Mechatronics
Processing & Customization
