Bussmann NSB FRS-R-500 Fuses

The Bussmann FRS-R-500 is a 500 A, 600 VAC / 300 VDC time-delay blade fuse in the RK5 class, part of Bussmann’s FRS‑R series. Its dual‑element design and time‑delay (slow‑blow) characteristics help tolerate brief inrush currents typical of large motors and transformers while still delivering reliable fault interruption. This 13-3/8 in long, 2-7/8 in diameter fiberglass‑bodied fuse uses blade terminals and is a rejection‑type device designed to fit HM600 or RM600 fuse blocks, and it is non‑indicating in operation. The FRS‑R‑500 provides an AC interrupt rating of 200 kA at 600 VAC and a DC interrupt rating of 20 kA at 300 VDC, with a 600 VAC / 300 VDC rating that supports protection in industrial power distribution and motor‑control circuits. Manufactured in Mexico, this fuse is listed under UL 248‑12 and CSA/CE standards, reflecting its suitability for rugged industrial environments. Designed for high‑current feeders and protection in control panels and switchgear, the FRS‑R‑500 combines a robust fiberglass body with a blade fuse style to ensure secure installation and reliable performance in demanding applications.