Amp Fuse Size Calculator

Introduction: Selecting the right fuse size is crucial to protect your electrical devices and prevent potential hazards. Our Amp Fuse Size Calculator assists in determining the recommended fuse size based on device power and system voltage. This ensures safe and efficient operation of your electrical system.

Formula: The calculator uses a simple formula: it divides the device power by the system voltage to calculate the recommended fuse size. This ensures that the fuse can handle the current flowing through the circuit without being too large or too small for the connected devices.

How to Use:

  1. Enter the power consumption of your device in watts.
  2. Enter the system voltage in volts.
  3. Click the “Calculate” button to obtain the recommended fuse size.
  4. The result will be displayed in the designated field in amps.

Example: Suppose you have a device with a power consumption of 500 watts and the system operates at 120 volts. After entering these values and clicking “Calculate,” the calculator will provide the recommended fuse size for the device.


  1. Q: Why is it important to use the correct fuse size? A: The correct fuse size protects your devices from overcurrent and minimizes the risk of electrical fires.
  2. Q: Can I use this calculator for both AC and DC systems? A: Yes, the calculator is suitable for both AC and DC systems. Ensure you input the correct system voltage.
  3. Q: Should I round up or down to the nearest standard fuse size? A: It’s generally advisable to round up to the nearest standard fuse size to ensure proper protection.
  4. Q: Can I use a fuse with a higher rating than recommended? A: It’s not recommended, as a higher-rated fuse may not provide adequate protection for your devices.
  5. Q: What if my device’s power is not listed on standard fuses? A: In such cases, round up to the nearest standard fuse size that can handle the calculated amperage.

Conclusion: Ensure the safety of your electrical devices by using our Amp Fuse Size Calculator. It provides a quick and accurate recommendation for the optimal fuse size based on device power and system voltage. Make informed decisions to protect your electrical system and devices.

Leave a Comment