HG109A6 by Danaher

The HG109A6 timer is manufactured by Danaher and belongs to the Timers and Controllers series. This plug-in module integrates into panel sockets to deliver repeatable on-and-off cycles that coordinate the actuation of motors, lights, or other machines in automated processes. By driving its internal contacts at user-selected intervals, it provides a simple method for interlocking devices or pacing batch operations without full PLC logic.

Inside the housing, two independent circuits are switched by two SPDT contact sets, so each timer output channel can deliver an isolated control signal. When energized, the contacts are rated for 10 A at 120 VAC, allowing direct switching of moderate resistive or inductive loads without an intermediate relay. The device draws only 2.5 VA from the line, minimizing heat within compact enclosures. Separate ON and OFF dials establish the timing scales, and the operating sequence follows an on-off repeat cycle that resets automatically. Once set, the interval length is maintained within 0.5% of the dial setting to support process consistency, and overlap between successive actions is limited to 1.5% of the total cycle to prevent contact chatter. The synchronous drive motor runs in phase with the 60 Hz mains frequency, eliminating long-term drift associated with internal oscillators.

The timing mechanism is rated for 10,000,000 operations during long-term service. The contact set can sustain electrical duty for 250,000 operations before refurbishment is expected. Motion is driven by a synchronous unidirectional motor that locks timing accuracy to the utility grid while preventing reverse backlash. Nominal control power of 120 VAC energizes the unit, making it compatible with standard branch circuits in North American machinery. The independent timing dials allow the energized and de-energized portions of each repeating cycle to be adjusted for the connected equipment. Its plug-in format also allows the timer to connect through a compatible panel socket without permanent internal wiring changes.