Abstract: In a lock fitted with a rotary latch (30), a detent (40) is provided that can engage inside a preliminary catch and inside a main catch (32) of the rotary latch (30). The rotary latch (30) receives a locking part and can be transferred either manually or by means of a motor between an open position, a preliminary catch position and a main catch position (30.2). The motor-driven displacement ensues via a closing aid or an opening aid. In order to obtain a space-saving design, the invention provides that a locking lever (10) is eccentrically mounted on the rotary latch (30) and is held in a central position by an impulse spring whereby functioning as a closing aid. A stationary, rotationally mounted driving element (50) serves an opening aid, and an opening lever (20) is rotationally mounted on this driving element. This opening lever (20) is also held in a central position by an impulse spring.