Electronic time relay, delayed on drop-out, with control signal and semiconductor output, time range 0.05-100 s, AC/DC 24-240 V, 50/60 Hz. A varistor for damping the relay coils is integrated. The spring-loaded connection allows for front-side snapping onto relays 3RT201 / 3RT202 and auxiliary relays 3RH2. The SIRIUS 3RA28 function module is designed for direct mounting on relays 3RT2 and auxiliary relays 3RH2, making it suitable for time-delayed switching operations in control, starting, protection, and regulation circuits, such as cascading motor starts or fan run-on control.

The simple and tool-free snap-on design enables the implementation of control-independent time functions without additional wiring, thereby avoiding wiring errors and reducing testing costs. By mounting it on the front side of the devices, you save space on the DIN rail. An additional protective circuit is not required. The devices can be used worldwide thanks to international approvals (e.g., IEC, CCC, UL/CSA). The function modules are available for relays 3RT2 and auxiliary switches 3RH2 in sizes S00 to S3. They come with a flexible wide voltage range of AC/DC 24-240 V, selectable outputs 1 S + 1 Ö or 1 W, and in screw or spring-loaded connection technology. Wiring kits and a sealable cover are available for the function modules. SIRIUS relays - a program for all cases.