Technical Information 105 Switching of resistive loads including moderate overloads Technical Information Utiization Categories A = Frequent Operations B = Infrequent Operations AC-Ratings DC-Ratings DC-PV Ratings AC-1 AC-2 AC-3 AC-4 AC-15 AC-20A AC-21A AC-21B AC-22A AC-23A AC-23B DC-20A DC-20B DC-21A DC-21B DC-22A DC-22B DC-23A DC-23B DC-PV0 DC-PV1 DC-PV2 Resistive or low inductive loads Slipring motor starting, reversing and plugging, star delta starting Conventional free-air thermal current: Highest test current for the temperature-rise test, without switching operations DOL starting and higher current star delta starting DOL starting, reversing, plugging, inching Switching of control devices, contactors, valves etc Switching of resistive loads including moderate overloads Switching of mixed resistive inductive loads, including moderate overloads (eg. series motors) Switching of motor loads, or other highly inductive loads (eg. series motors) Connecting and disconnecting under no load conditions Opening and closing a PV circuit to disconnect when NO current is flowing Switching on and off individual PV strings where neither reverse current nor significant overcurrent can occur Switching on and off a PV circuit where significant overcurrents can occur and the current can flow in both directions; For example, with several strings connected in parallel to one inverter, or one string with one battery No load operation Occasional switching of motors or other high inductive loads Frequent switching of motors or other high inductive loads Switching of combined resistive or low inductive loads including moderate overloads Switching of resistive loads, including overloads Ith
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