How do you select a fuse for a DC circuit?

Proper selection of an input fuse for a dc-dc converter involves understanding and consideration of the following factors:

  1. Voltage Rating.
  2. Current Rating.
  3. Interrupting Rating.
  4. Temperature Derating.
  5. Melting Integral (I2t)
  6. Maximum Circuit Fault Current.
  7. Required Agency Approvals.
  8. Mechanical Considerations.

Are there DC fuses?

DC Fuses. In a DC circuit, when the current exceeds the limit, the metallic wire in the fuse melts and disconnects the rest of the circuit from power supply. Since DC is constant value and is always above 0V, there is a chance of an electric arc between the melted wires, which will be difficult to avoid and turn off.

What are the 5 types of fuses?

The low voltage fuses are divided into five types and those are of the rewirable, cartridge, drop out, striker, and switch fuses.

What is a DC fuse?

Mersen DC fuses provide the ultimate protection of the battery modules and battery packs, offering reliable clearing of DC fault currents. They have been specifically engineered and tested to provide DC applications best-in-class performance.

Is there a difference between AC fuses and DC fuses?

The main difference between a fuse’s AC and DC ratings is the ability to stop the arcs that form when the fuse blows. DC arcs are harder to stop than AC arcs, so you will often see fuses that are only rated for 32VDC.

Can you use AC fuses for DC?

AC fuses will work fine for DC circuits. They depend on a fusible link which simply measures current and melts if the current gets too high. The only real concern is the fuse’s ability to actually interrupt the circuit. Fuses are first rated by the ac and/or dc circuit voltage into which they can be safely applied.

Are fuses rated by volts?

For instance, all fuses are straight voltage rated and there is no need to be concerned about slash ratings. However, some mechanical overcurrent protective devices are slash voltage rated (i.e.: 480/277, 240/120, 600/347).

Can you use a 240v fuse in a 12v circuit?

Yes, it will be fine. Fuses sometimes have a maximum voltage rating that they can safely interrupt, but that’s a function of the distance between the terminals and the insulating material used. (For instance, most car-type blade fuses are rated for 32 volts.)