What does over range mean on a fuse?
Over-Range is the meter indication to expect from a blown fuse outside of the circuit. The resistance value is nearly infinite, so it is above the range of even a 100M ohm meter.
When does a fuse have a peak let through current?
This reduced peak current is referred to as a fuse’s “Peak Let-through Current.” 2. When the fault current exceeds the fuse threshold current, the fuse must open the circuit in less than 180 electrical degrees (1/2 cycle) after the start of the fault. 3.
What are the different types of fuses rated for?
These fuses are rated for 601 through 6000A, and are rated to interrupt a minimum of 200kA. They are labeled “Current-Limiting” and are rated for 600Vac. They are intended to be bolted into their mountings and are not normally used in clips.
When is it OK to blow a fuse?
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. Don’t forget to turn the multimeter OFF when you have finished testing.
Over-Range is the meter indication to expect from a blown fuse outside of the circuit. The resistance value is nearly infinite, so it is above the range of even a 100M ohm meter.
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.
What do you need to know about fuses?
About this guide Fuses are current-sensitive devices that provide reliable protection for discrete components or circuits by melting under current overload conditions. Choosing the right fuse for your application can be an overwhelming, time-consuming process, even for a seasoned electronics design engineer.
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. Don’t forget to turn the multimeter OFF when you have finished testing.