The housing is glass-filled nylon (PA), which holds up in industrial cabinets but not in extreme heat: the operating range tops out at 65°C, so this is an indoor, controlled-environment part, not something for an engine bay or a foundry floor. The 30 A per-circuit rating puts this in bus-level power territory — each blade socket carries enough current for a main DC rail or a motor feed, not a signal line. You order the matching female blade crimp terminals separately, then terminate the wires and insert them into the cavities.
Does 1982299-6 Include Contacts?
No. The note on this part is clear: contacts are not included. If you're filling a BOM line, make sure the matching crimp terminal is on the same order — otherwise you'll have a housing with nothing to wire.
The 1982299-4 is the same 2-position, 7.80 mm pitch, same latch lock, same 30 A capability — but it's a plug, not a receptacle. If you already have the 1982299-6 receptacle on the harness side, the 1982299-4 is the matching plug half. Same glass-filled nylon housing, same crimp terminal family, same side-to-side stackable design. The only decision is which side gets the receptacle and which gets the plug.