In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current.
Why do we need electric fuse?
The fuse breaks the circuit if a fault in an appliance causes too much current to flow. This protects the wiring and the appliance if something goes wrong. The fuse contains a piece of wire that melts easily. If the current going through the fuse is too great, the wire heats up until it melts and breaks the circuit.
What is the importance of a fuses?
A fuse(s) is needed in any electrical system (AC or DC). These protection devices react to the amount of heat being produced by electricity passing through wires and/or components. They are used so as to protect wires and components from the extreme heat produced should there be an electrical overload or short circuit.
Do you always need a fuse?
You need a fuse if you want to limit possible damage if something got shorted. This is defenetly possible with non-protected LiIon batteries for example. For low-voltage applications there are self-healing fuses (often found on motherboards, especially for USB protection).
What are the 3 types of fuses?
Different Types of Fuses – Constriction, Working & Characteristics
- DC Fuses.
- AC Fuses.
- Cartridge Fuses.
- D – Type Cartridge Fuse.
- HRC (High Rupturing Capacity) Fuse or Link Type Cartridge Fuse.
- High Voltage Fuses.
- Automotive, Blade Type & Bolted Type Fuses.
- SMD Fuses (Surface Mount Fuse), Chip , Radial, and Lead Fuses.
Do all appliances need a fuse?
For appliances up to 700w you need to use a 3A fuse and for appliances over 700w you need to use a 13A fuse. Most appliance manufacturers have now standardised plug fuse ratings to either 3A or 13A. But take care; some older equipment may use 5 amps fuses which are still available today.
How many types of electrical fuses are there?
LV 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 an electric fuse and why it is important?
Answer: An electric fuse is a safety device which prevents damage to an electrical circuit when excessive current flow through it.
What fuse to use?
For an appliance rated as 700W or less, a 3A fuse should be fitted. For appliances above 700W, a 13A fuse should be fitted. One complication of using the 700W rule is that some appliances can draw a higher current when they are first switched on (inrush current).
What amp fuse do I need?
Plugs for appliances rated between about 700 watts and 3000 watts (the maximum rating of a wall socket) should be fitted with a 13-amp fuse (coloured brown). For example: 13A Fuse – Washing machine, dishwasher, microwave, kettle, toaster, iron.
When should a fuse be put?
Fuses should always be connected to the hot wire and should be placed before any other component in the circuit. In most projects, the fuse should be the first thing the hot wire connects to after it enters your project enclosure.
Does a relay act as a fuse?
So to sum up, a fuse is a one time protection device that interrupts a circuit. A relay is a device controlled by another part of the circuit and operated to connect or interrupt the circuit many times.