The use of closer rated time-delay fuses can improve circuit protection. Garibaldi 602W Elite Sousaphone Silver Plated Single-Cup Mouthpiece Size 602W The Garibaldi Elite Silver Plated Single-Cup Sousaphone Mouthpiece is the perfect choice for any Sousaphone player looking to improve their sound Allow the use of lower rated fuses in existing equipment Class J rejection fuse reducer Class J rejection fuse reducer · Allow the use of lower rated fuses in existing equipment · The use of closer rated time-delay fuses can improve circuit... Bussmann® J-63 Rejection Fuse Reducer, 600 VAC, 1 To 30 A, Class J Renewable or one-time fuses feeding a motor can be replaced with fuses sized closer to the motor nameplate current. FERRAZ SHAWMUT R212 100-200A R Fuse Reducer, Brass, 100-200AMP, 250 The use of closer rated time-delay fuses can improve circuit protection Class J fuse reducer isn't for bolt on applications. 250V voltage rating and 30A fuse current, 60A holder current. UL listed guide no. IZZR. CSA certified. Rejection-type reducer will allow only class J fuses to fit class J clips.