The distinguishing feature of slo-blo fuses is that these fuses have additional thermal inertia designed to tolerate normal initial or start-up overload pulses. Fuse characteristics can be classified into three general categories: very fast acting, fast acting, or slo-blo. This type of fuse is not designed to withstand temporary overload currents associated with some electrical loads.įuse Characteristics The characteristics of a fuse design refers to how rapidly the fuse responds to various current overloads. The other element, the short circuit section operates on short circuits up to their interrupting rating.įast Acting Fuse A fuse which opens on overload and short circuits very quickly. One element, the spring actuated trigger assembly, operates on overloads up to 5-6 times the fuse current rating.
Contact us for more information.ĭual Element Fuse Fuse with a special design that utilizes two individual elements in series inside the fuse tube. Also, it will limit the instantaneous peak let-thru current to a value substantially less than that obtainable in the same circuit if that fuse was replaced with a solid conductor of equal impedance.ĭerating In 25 deg.C ambient temperatures, it is recommended that fuses operate at no more than 75% of the nominal current rating established using the controlled set of test conditions. When a fuse operates in its current limiting range, it will clear a short circuit in less than 1/2 cycle. Clearing time is the total of the melting time and the arcing time.Ĭurrent Limitation A fuse operation relating to short circuits only.
Learn more about these devices in ourĬlearing Time The total time between the beginning of the overcurrent and the final opening of the circuit at rated voltage by an overcurrent protective device.
We sell a range of bussed fuse holders that utilise an internal bus to distribute power from a single input to each fuse circuit in the holder.īreaking Capacity (See interrupting rating)Ĭartridge Fuse A fuse consisting of a current responsive element inside a fuse tube with terminals at both ends.Ĭircuit Breakers A thermal circuit breaker is designed to protect a circuit from overload, but can be reset once the fault is rectified. A bus can be used to provide a single power or ground connection to multiple circuits. This can reduce wiring and termination of each individual pole. AWG #12 is a thinner wire than AWG #10.īus / Bussed / Bussing The process of joining multiple poles or circuits to a single connection point ie. Increasing AWG numbers give decreasing wire diameters ie. Because there are also small gaps between the strands, a stranded wire will always have a slightly larger overall diameter than a solid wire with the same AWG number. The AWG of a stranded wire is determined by the total cross-sectional area (mm²) of the conductor. The fuse ambient temperature is appreciably higher in many cases, because it is enclosed (as in a panel mount fuseholder) or mounted near other heat producing components, such as resistors, transformers, etc.Īmerican Wire Gauge (AWG) The American Wire Gauge (AWG) chart was created to classify cables with a single, solid, round conductor. When a fuse is subjected to a current above its ampere rating, it will open the circuit after a predetermined period of time.Īmbient Temperature The temperature of the air immediately surrounding the fuse and is not to be confused with 'room temperature'.
Ampere Rating The current carrying capacity of a fuse.