Product Overview. The FRS-R30 is a 30A/600VAC class-RK5 dual element Time Delay Fuse for rejection or ordinary fuse clips. This FRN-series fuse provides motor overload, ground fault and short-circuit protection. Permits the use of smaller and less costly switches.
What does R mean on a fuse?
The R after the hyphen is a symbol to represent that the particular fuse is a “rejection” type fuse. Their design is slightly different and have higher interrupt ratings than the FRN type fuses.
What is a class R fuse?
Class R (“R” for rejection) fuses are high performance, 1⁄10 to 600A units, 250V and 600V, having a high degree of current-limitation and a short-circuitshort-circuitA short circuit (sometimes abbreviated to short or s/c) is an electrical circuit that allows a current to travel along an unintended path with no or very low electrical impedance. ... The opposite of a short circuit is an "open circuit", which is an infinite resistance between two nodes.https://en.wikipedia.org › wiki › Short_circuitShort circuit - Wikipedia interrupting rating of up to 300,000A (RMS symmetrical). ... NEC® 110.9 requires that protective devices have adequate capacity to interrupt short-circuit currents.