Siemens OND-DFSB-120 DIN Rail On Delay Timing Relay

Siemens OND-DFSB-120 DIN rail on-delay timing relay delivers precise delayed-on activation with DPDT contacts, all in a compact DIN-rail mount package designed for seamless integration in standard automation panels and control circuits. Its timing range spans 0.1 seconds to 10 hours, covering short-run delays such as equipment ramp-up and longer delays for sequencing or interlocks in process control, with ON-delay operation initiating the output after the input signal remains applied for the defined interval. The device operates from a 120 V AC/DC coil and provides DPDT (two Form C) contacts rated at 12 A, enabling two independently controlled circuits from a single module while handling typical loads used in industrial automation. DIN rail mounting supports quick installation in control cabinets, matching form-factor expectations within the Siemens SIRIUS timing-relay family and allowing convenient replacement or upgrade in panel layouts. Two Form C outputs allow flexible timing schemes within one unit, simplifying panel wiring, reducing the need for extra relays, and enabling coordinated sequences such as timed power-on for auxiliary equipment.