A connector arrangement for connecting the bare ends of a plurality of insulated conductors to a horizontal row of first contacts arranged on an electrical device, respectively, including a main housing having a side portion containing a chamber in which the electrical device is mounted, a connector housing pivotally connected with the main housing for pivotal movement about a vertical pivot axis between engaged and disengaged positions, the connector housing supporting a horizontal row of conductor contacts arranged to engage the first contacts when the contact housing is in the engaged position, and a manually-operable locking arrangement for locking the connector housing in the engaged position. The locking arrangement includes a locking projection fixed to the main housing, a catch member movably connected with the connector housing, and an actuating member for displacing the catch member between locked and unlocked positions relative to the locking projection.