Rail-mounted device for installation on a mounting rail (1 TE). Simply connect the neutral conductor to the terminal (N) and the live conductor to 1 (L). This results in an additional standby consumption of only 0.1 watts. If the contact is used to control switching devices that do not switch at zero crossing, (N) should not be connected, as the additional closing delay would have the opposite effect. An internal ring core current transformer compares the alternating current flowing through a load V1 from 0.1 A to a maximum of 32 A with the set value, and if exceeded, a relay disconnects a load V2 connected to 2 within 0.5 seconds or connects a load V3 connected to 3. Setting accuracy ±5%. The relay always switches on from 25 A. State-of-the-art hybrid technology combines the advantages of wear-free electronic control with the high performance of special relays. The current base A is set using the lower locking rotary switch A.