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primos 250 solar thermal controller.The difference between a fuse resistor and a fuse

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2024-02

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　　A fuse resistor has a similar function to a fuse, that is, it can cut off the current when the circuit is overcurrent and also act as a fuse. Therefore, many people are prone to confusion. However, the load of a resistor has a certain limit, and if the current flowing through the resistor exceeds the limit, it will burn out the resistor, causing it to appear in an open circuit state. This is different from the fuse's blow protection.

　　The protection function includes overload protection and short circuit protection, that is, when the circuit experiences unacceptable overcurrent up to the limit of short circuit overcurrent, the fuse must act within the specified time range to protect the circuit or components. However, the technical parameters such as the starting time and duration of the fuse resistor cannot be as accurate as the fuse, and overload current protection cannot be guaranteed, It can only have a slight effect on short-circuit current.

　　The carrying function of a fuse is guaranteed by the melting heat value, so that the fuse can withstand a certain amount of pulse impact of necessary switching times. We need to calculate and evaluate it when selecting it. However, the fuse resistor itself does not have similar technical indicators, and if used small, it will be broken by the pulse, and if used large, it will have no protective function.

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