Bussmann FRS-150 Fusetron Dual Element Time Delay Fuse

The Bussmann FRS-R-150 Fusetron is a 150 A dual‑element, time‑delay fuse in the RK5 class designed to protect circuits that experience inrush, such as motors and transformers. It is a current‑limiting fuse rated for 600 VAC or 300 VDC with an interrupting capability of 200 kA at 600 VAC and 20 kA at 300 VDC, providing reliable protection without tripping on normal startup surges. The cartridge body is fiberglass with dimensions of 1.61 inches in diameter by 9.63 inches in length, and it uses knife‑blade terminals for holder mounting. It is a non‑indicating fuse, though an open‑fuse indication option is available on select ratings. The FRS-R‑150 embodies Bussmann’s dual‑element, time‑delay design that protects against short circuits while tolerating temporary overloads, enabling closer sizing to full‑loadamps for inductive loads. Typical applications include motor controllers, transformers, and other equipment that exhibit brief surges during startup or load changes, where dependable motor and transformer protection is essential.