The PowerCon conector is made by Neutrik, a European manufacturer, and, as such, there are some terms that the manufacturer uses that may not be familiar to American users.
Here Are A Few-
Mains Power-The power provided from the source (a wall outlet or a electrical service panel) needed to power an electrical device.
Chassis Connector-The power inlet on a piece of equipment that is powered by a removable connector.
Line Connector-A connector permanently mounted on an electrical cable.
Type A Connector-The connector that provides the power source. This is the connector that the power flows from. In the PowerCon connector series, The Type A connector is blue.
Type B Connector-The connector that receives the incoming power. This is the connector that the power flows to. In the PowerCon connector series, the Type B connector is grey or white.
Under Load-The state of an electrical device being in the “on” or “powered up” state. This means that as soon as the device is connected to a power source, it will be in the turned on mode. The standard PowerCon connector is not intended to be used on a device that will be under load when connected.