Disconnector contact system with controlled discharge

A disconnector for an electrical apparatus, the disconnector comprising:

• a first contact having a longitudinal center axis;
• and
• a second contact, wherein at least one of the first contact and the second contact is movable in a direction of the longitudinal center axis of the first contact, wherein the first contact is connected to the second contact in a closed position, wherein the first contact is disconnected from the second contact in an open position, wherein the second contact comprises a pre-determined contact portion that has a roughness higher than a roughness of neighbouring contact portions of the second contact, and wherein the pre-determined contact portion is closer to the longitudinal center axis of the first contact than are said neighbouring contact portions,
• wherein a minimum roughness of the pre-determined contact portion of the second contact has an Arithmetic average roughness value (Ra) of 1 microns, Total height of the roughness profile (Rt) of 8 microns, and a Mean roughness depth (Rz) of 4 microns.