Bussmann LPJ-50SPI Low Peak Indicators Class J Fuse

LPJ-50SPI is a Bussmann (Eaton) LPJ Low-Peak Class J fuse rated for 50 A, suitable for circuits up to 600 VAC or 300 VDC. It employs a dual-element time-delay design to tolerate brief inrush and surge currents while providing robust protection against longer faults. The device carries a 300 kA interrupting rating at 600 VAC and 100 kA at 300 VDC, and, as indicated by the I suffix, includes an open-fuse indicator for panel monitoring of failure states. The LPJ family uses a cylindrical fuse element with a yellow label and a copper element inside, reflecting its common construction for low-peak protection in power distribution and industrial control panels. This 50 A model sits within the LPJ range of 1–60 A ratings and is intended for applications that require current limiting with low peak let-through and a visible fault status indicator.