1/4" x 1-1/4" (6.3mm x 32mm) Physical Footprint, 20A Current Rating, Fast-Acting Ceramic Tube Heavy-Duty Instrument Fuse, 250VAC/125VDC Maximum Voltage, 400A Interrupting Capacity at 250VAC, -40°C to +85°C Standard Operational Window | High-capacity commercial-grade electrical power distribution network fuse manufactured by Bussmann (Eaton) utilizing a high-purity internal silver melting link track embedded inside an advanced heat-suppressing silica filler matrix, optimized to provide rapid overcurrent clearing windows, prevent dynamic thermal flash anomalies, and cleanly isolate downstream motor controllers and battery bank test charging decks from catastrophic system phase faults | Industry Exact Equivalents: Bussmann ABC-20, Eaton ABC-20, Bussmann ABC20-R, Bussmann ABC20 | Industry Functional Cross-References: Littelfuse 0314020.MXP, Ferraz Shawmut GAB20, Bel Fuse 3AB 20 | Military Specification National Stock Number (NSN): 5920-01-445-0320