125V Fuse Vs. 250V Fuse
Fuses are essential components in electronic circuitry, detecting the current flow in a circuit and causing it to open if the current exceeds a certain level. This prevents permanent damage to sensitive electronic components, such as integrated circuits and transistors. Fuses protect equipment only from excessive current flow, not from voltage spikes.
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Fuse Characteristics
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The three main characteristics of a fuse are its physical construction, operating voltage and current rating. Many applications require unique physical designs. For example, the ability to withstand vibration is critical in an automotive fuse.
Operating Voltage
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If you exceed a fuse's voltage rating, you run the risk of it operating improperly when it exceeds its current rating. It is acceptable to use a fuse below its voltage rating--for example, a 250 V fuse in a 125 V circuit. Voltage ratings are always specified for AC unless specifically labeled DC. Fuses with higher voltage ratings are usually more expensive and larger than fuses rated for lower voltages.
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Current Rating
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The current rating of a fuse specifies the current flow that will cause the fuse to blow. For example, a 5 A fuse will blow and open the circuit when the current exceeds 5 A.
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References
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