CUBEFuse™ Circuit Fuses & Holders Bussmann / Eaton CUBEFuse™ Circuit Fuses and Holders are a finger-safe industrial fuse system that minimizes exposure to live parts. These devices feature a dual-element fuse construction while offering interrupt ratings from 50kA DC to 300kA DC, voltage ratings of 600VAC (or less), and an amperage range from 1A to 100A. Both the holders and switches have an amp rating rejection feature to help prevent over-fusing and an operating temperature range of -40°C to +80°C or +90°C.