Switching current is the maximum rated current that can flow through the switch as it makes or breaks a contact. Switching active currents higher than those specified in the switch documentation can result in arcing that can damage the contacts of electromechanical relays. A minimum current specification indicates the smallest current that can reliably flow through the switch.

Switches can also have carry current. Carry current is the maximum rated current that can pass through a closed switch, or the current that a switch can carry. Carry current can be larger than switching current. However, since carry current can only flow while the switch is closed, the current needs to be stopped while the switch operates.