The standard manual reset fuse block replaces the blown media ATO or ATC fuse block. Manual push button reset fuse block meets ABYC circuit protection requirements. In case of short circuit, disconnect immediately. Protects equipment by preventing overcurrent surges in circuits. If the fuse in the fuse box explodes, just manually press the reset button on the top to use it again without replacing the fuse. 12 piece 3Amp is compatible with all other ST-Blade blade fuse blocks, best paired with taller fuse holders like the B08FQWZ3HV Manual reset fuse set meets UL 94V0 standard thermoplastic. Tin plated finish is protected against overheating and overcurrent. Colour:As Shown Material:plastic Package Contents: 1 set x circuit breaker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.