The sunrise (aka universal) adapter uses a mounting system common in the power industry for mounting adapters to operating poles and earth sticks.
It allows attachments to be mounted at an angle.
See also
Universal Adapter (Aluminium)
Universal Adapter (Bronze)
Hook Disconnect Adapter
Starlogixs 240V-220kV Contactless Voltage Detector
Low Voltage Disconnect for NZI LV Porcelain Fuses
