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Hot in hot out and return, looks like a mains switch circuit, like some older power supplies used to have outputs that were switched with the main PC power for monitors so they turned off at the same time. You'd have to take a photograph of the actual part in the circuit, that schematic is useless to find a replacement.
You have a schematic; not a pcb or a parts layout. If are building it from just a schematic, then the parts layout is up to you. AFIK, the item you asked about is a wiring connector. The physical attributes of the connector is up to you. All the schematic implies is that it is a 3 pin connector. Digikey and other electronics distributors sell thousands of different connectors.