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First of all you need to observe maximum current at various possible supply condition (i. e. 220VAC to 260VAC). Then check the inrush current for the equipment. When you start an high power device then it draws 4 times more current than usual. Your fuse should also take care of inrush current.
For example: if maximum possible current is 500mA then your inrush current may go upto 2A. Thus if you put a fuse of 600mA then everytime you turn on the device, it may burn the fuse. So the suitable fuse for such condition is 2A
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What is the correct formula to calculate a fuse rating?
watts Divided by Volts = amps
Can a 3a 125 v fuse be replaced with a 3a 250v fuse?
Yes, a 3A 250V fuse can replace a 3A 125V fuse, as the voltage rating of the replacement fuse is higher than that of the original. The critical factor is that the current rating (3A) remains the same, ensuring it will blow under the same overload conditions. However, it's essential to ensure that the device or circuit is designed to operate safely within these ratings. Always follow manufacturer guidelines for fuse replacement to maintain safety and functionality.
How do you calculate trade discounts?
You have to ask the seller what trade discount they will give you. Its usually a sliding scale based on volume or established rating of the buyer with that seller.
What minimum fuse rating is needed for a 12 volt circuit when using one 48 watt bulb?
The formula you are looking for is Watts = Amps x Volts. Amps = Watts/Volts. This comes to 4 amps load. Minimum size fuse would be 5 amps.
How can i calculate amperes for transformers?
Find the wire from the secondary of the transformer. If it's a step-down transformer the thicker wire is the secondary. Measure its diameter in inches and calculate its cross-section area in square inches. The current rating for transformer wire is 1000 amps per square inch, or 1.55 amps per square mm.
