Zero-ohm link

Zero ohm resistors can also be used as configuration jumpers or in places where it should be easy to disconnect and reconnect electrical connections within a PCB to diagnose problems.

The resistance is only approximately zero; only a maximum is specified, which is typically in the range of 10–50 mΩ.

[4] However, it is common practice for manufacturers and retailers to list zero ohm resistors with a percentage tolerance.

[5] In cases where a percentage tolerance is specified, this value generally refers to the tolerance class that should be referred to within the datasheet or parts catalogue in order to find the absolute maximum resistance specification for the 0Ω part.

Surface-mount zero-ohm resistors are usually marked with a single or multiple "0" (if size allows marking), where the number of digits can indicate the tolerance or maximum resistance rating, as is the case with regular resistors.