Looks like this is what plugs into it:
Clipsal connectors
View attachment 1715016414
Clipsal 492/32 DC plug, not wired
In Australia, a T-configuration
Clipsal socket is used for
extra-low voltage DC power outlets, such as in
stand-alone power systems (SAPS) or on boats, in order to prevent accidental connections of 12 V appliances into 240 V socket-outlets.
[11] This connector is also used for temporary equipment in emergency vehicles.
The connector pins are mutually
perpendicular, and are usually oriented to look like a capital T. In the state of
Victoria, the top of the T is taken to look like a minus sign, and has been assigned to negative polarity. In the rest of Australia, the vertical pin is assigned to earth/chassis ground, consistent with Australian Standards for Type I 240 volt outlets; therefore, the top of the T is positive on a negative-earth vehicle. Older positive-earth vehicles are still in service, so actual polarity at the outlet can be random, and must be verified to avoid equipment damage.
Treblig
