Mersen OTM Series Series Ferraz Shawmut is Mersen. Mersen OTM One-Time midget fuses provide low-cost protection for 250VAC general purpose lighting, heating, control circuits, etc. where time-delay is not required. (Not for Branch Circuit Protection). Other Names: OTM20, OTM 20 Amp, OTM-20, OTM 20A, OTM20A, OTM-20A, OTM 20 Product specifications Ampere 20 A Voltage rating 250 Vac Interrupt rating 10 kA Speed Fast-Acting Class Midget Shape Cartridge Fuses Approvals UL, CSA, RoHS Substitute parts Bussmann BAF, Littelfuse BLF Datasheet Mersen OTM Datasheet Dimensions 0.41" Dia x 1.5" L (10.41x38.1mm) Item weight 0.2 oz Other names OTM20, OTM 20 Amp, OTM-20, OTM 20A, OTM20A, OTM-20A, OTM 20 WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.