3 AMP SURFACE MOUNT PCB FUSE
Manufactured by Littlefuse as part of their 452 'Nanofuse' range, these are an industry standard surface mount fuse 3 Amp, slow blow / time delay.
Package style is simply known as a Nanofuse, they are tiny, often found soldered directly to circuit boards or also sometimes they are in miniature board mount fuse holders, for easier replacement.
The dimensions are 6.1mm long x 2.7mm square.
Priced and supplied in packs of 2 pieces with quantity discounts available