Mersen AJT20 Amp-Trap 2000 SmartSpot Power Fuse. Ferraz Shawmut AMP-TRAP 2000 SmartSpot Power Fuse, Current Limiting Low Voltage North American Time Delay, Series: AJT, Indicating, Rejection, 20 A, 600 VAC, 200 kA Interrupt, Class: J, Ferrule Terminal, Clip Mounting, Cylindrical Body, Dual Element, Fiberglass, 13/16 in Dia x 2-1/4 in L Body. Additional Description: MERS-AJT20 J TD FUSE 600V 20A AJT. Catalog Description: Amp-Trap 2000 time-delay AJT fuses provide IEC Type 2 (No Damage) protection to main, feeder, and branch-circuits, for all types of loads - yet, they require only half the mounting space needed for 600V UL Class RK fuses. Time-delay characteristics handle motor in-rush currents without nuisance trips. Its current-limiting ability and wide range of ratings provide excellent overcurrent protection for all your applications. An optional mechanical blown fuse indicator and Microswitch is available on blade-type (70 to 600A) fuses for visual and/or remote blown fuse indication. 600 Volts 20 amps ..