Bussmann NOS Series Bussmann NOS basic protection general purpose, non-current-limiting, one-time fuses. Protect lighting, heating, and other circuits not subject to temporary surges and where available short-circuit currents are relatively low. Other Names: NOS4, NOS 4 Amp, NOS-4, NOS 4A, NOS4A, NOS-4A, NOS 4 Product specifications Ampere 4 A Voltage rating 600 VAC Interrupt rating 50 kA Speed Medium / Normal Blow Class Class K5 and H Fuse Shape Cartridge Fuses Approvals CE, UL, CSA Substitute parts Mersen OTS Datasheet Bussmann NOS Datasheet Dimensions 0.81" Dia x 5" L (20.57x127mm) Item weight 1.76 oz Other names NOS4, NOS 4 Amp, NOS-4, NOS 4A, NOS4A, NOS-4A, NOS 4 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.