What is the resistance of an open fuse circuit?
An open circuit implies that the two terminals are points are externally disconnected, which is equivalent to a resistance R=∞ . This means that zero current can flow between the two terminals, regardless of any voltage difference.
What does it mean when fuse is blown?
Understanding a Digital Multimeter Reading. Fuse is OK: If the multimeter reading changes to a low resistance value (similar to the result of touching the 2 leads together). Fuse is Blown: If the meter reading does not change and display still shows the original 100% resistance state.
How is the resistance of a Fuse considered?
Refer to the section on PULSES in the FUSE SELECTION GUIDE. RESISTANCE:The resistance of a fuse is usually an insignificant part of the total circuit resistance. Since the resistance of fractional amperage fuses can be several ohms, this fact should be considered when using them in low-voltage circuits.
How often do you get a blown fuse?
Most people probably have experienced a blown fuse at one time or another. Someone always knows what to do when this happens. If you’re a homeowner, that person probably is you. Blown fuses are a common occurrence.
What kind of voltage does a fusible resistor pass?
The fusible resistor used in the circuit operates high voltage with small or lower currents such as 100ma, 250ma. A fusible resistor can pass the pulse of a high volt like 500v without failure, but it must fuse quickly without flames when 100v short circuit overloads.
Understanding a Digital Multimeter Reading. Fuse is OK: If the multimeter reading changes to a low resistance value (similar to the result of touching the 2 leads together). Fuse is Blown: If the meter reading does not change and display still shows the original 100% resistance state.
Refer to the section on PULSES in the FUSE SELECTION GUIDE. RESISTANCE:The resistance of a fuse is usually an insignificant part of the total circuit resistance. Since the resistance of fractional amperage fuses can be several ohms, this fact should be considered when using them in low-voltage circuits.
When does a fuse blow for a surge current?
A slow-blow fuse does not blow for a temporary surge current; it must receive a sustained elevated current above its current rating for a period of time before it blows. This is why it is called a slow-blow fuse. A typical fuse will blow right away once it receives current above its current rating.
What does the current rating on a fuse mean?
CURRENT RATING:The nominal amperage value of the fuse. It is established by the manufacturer as a value of current which the fuse can carry, based on a controlled set of test conditions (See RERATING). Catalog Fuse part numbers include series identification and amperage ratings.