HG107A6 by Danaher

The HG107A6 interval timer is built by Danaher within the Timers and Controllers series. It inserts precise on-off periods into industrial automation loops, allowing pumps, feeders, or lighting circuits to run for a selected portion of a repetitive cycle without relying on software timing inside a PLC. The module mounts in a dedicated socket that preserves wiring continuity during service. Typical applications include packaging equipment, water treatment systems, and small-machine sequencing tasks.

The timer operates from a 120 V, 60 Hz supply that powers a synchronous, unidirectional drive motor for consistent cycle timing. Its internal burden is limited to 2.5 VA at 120 VAC, placing only a light load on the panel transformer. The contact configuration is SPDT, allowing the common terminal to switch between normally open and normally closed paths. The contacts carry up to 10 A at 120 VAC with a resistive load, making them suitable for compatible heaters, solenoids, and control circuits. Once the dial is set, the timer repeats with a maximum deviation of 0.5% of the dial setting, helping maintain predictable process timing. Screw terminals on the rear base provide secure power and control connections.

Cycle overlap remains below 1.5% of the total cycle, reducing timing interference between cam-operated switching events. The mechanism has a mechanical life of 10,000,000 operations, supporting frequent cycling in repetitive machinery. The electromechanical contact assembly has a life rating of 250,000 operations at 10 A and 120 VAC. Concentric front knobs allow the cycle range and fine timing value to be adjusted without tools. The plug-in case fits through a 3.187-inch panel cutout and is secured by a pair of 8-32 mounting screws. Its twelve-pin base provides 12 terminals for the contact connections and synchronous motor supply.