fast blow or slow blow fuse for multimeter.What are the standard requirements for self restoring fuse technology?

　　Self recovery fuse is a type of overcurrent electronic protection component, which is made by mixing conductive particle materials with polymer organic polymers under high pressure, high temperature, and vulcanization reaction conditions, and processed through special processes. What are the standard requirements for self restoring fuse technology? 1. The rated zero power resistance PPTC thermistor should be packaged in different levels according to the zero power resistance, 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|

　　2. The PTC effect refers to a material with a Positive Temperature Coefficient (PTC) 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. The nonlinear PTC effect is a phenomenon in which the resistance of materials undergoing phase transformation 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. The initial resistance Rmin is tested at an ambient temperature of 25 ℃ before being installed in the circuit, and the resistance value of the polymer PTC thermistor of the self resetting fuse series.

　　5. Rmax operates or reflows a self restoring fuse series polymer PTC thermistor at room temperature. The maximum resistance value 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 restoring 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.

　　7. Holding current IHold is the maximum current that can be passed through the polymer PTC thermistor of the self resetting fuse series when it is not in operation. Under limited environmental conditions, the device can be maintained for an infinite period of time without transitioning from a low resistance state to a high resistance state.

　　8. The minimum steady-state current of the self resetting fuse series polymer thermistor that can operate within a limited time under limited environmental conditions under action current Itrip

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