What is fuse operation?
The fuses work on the principle of the heating effect of the current. Fuse is always connected in series with the electrical circuit. When the excessive current or heat is generated due to heavy current flows in the circuit, the fuse melts down due to the low melting point of the element and it opens the circuit.
What is fuse clearing time?
Clearing Time (see Figure 11) – The time between the initiation of an overcurrent condition to the point at which the overcurrent is interrupted. Clearing Time is the sum of Melting Time and Arcing Time.
What is arcing time for a fuse?
The time taken from the initiation of the arcs to their being extinguished is called the arcing time. The sum of the pre-arcing and arcing time is the total clearing time (see Figure A2). During the pre-arcing and the arcing times a certain amount of energy will be released depending on the magnitude of the current.
How does a fuse work in a circuit?
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 fusing current?
Fusing current: It is the minimum current at which the fuse element melts and thus disconnects the circuit protected by it. Obviously, its value will be more than the current rating of the fuse element.
What is the difference between current-limiting and time delay fuses?
In addition to providing time-delay for surges and short time overloads, time-delay fuses meet all UL requirements for sustained overload protection. On higher values of current, time-delay fuses are current-limiting; meaning they remove large overcurrents in less than one-half cycle (0.00833 seconds).
What is a non time delay fuse?
Non-Time-Delay Fuses They are electrically connected to the end blades (or ferrules) (see Figure 1) and enclosed in a tube or cartridge surrounded by an arc quenching filler material. Cooper Bussmann Limitron® and T-Tron® fuses are both single-element fuses.
What do you mean by arcing time?
Definition: The time between instant of separation of the CB contacts and the instant of arc excitation.
Can I replace a fast acting fuse with a time delay fuse?
The fast acting ones cannot take the place of the time delay models, though. Their fuse wire will melt because of the initial excess supply of electricity. However, replacing the fast acting fuses with the time delay versions will not be cost-effective because the latter is more expensive.