HG105A6 Danaher
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The Danaher HG105A6 is an ON-Off repeat cycle timer from the Timers and Controllers series with a synchronous unidirectional motor and a line frequency of 60 Hz. It features 2 SPDT output contacts rated for 10 Amps at 120 VAC and a supply voltage of 120 VAC. The timer has a mechanical life of 10,000,000 operations and maintains repeat accuracy within ±0.5% of dial.
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Product Description:
The HG105A6 is an on-off repeat-cycle timer produced by Danaher for the Timers and Controllers series. A synchronous unidirectional motor drives the internal cam stack, so the cycle length remains constant despite line voltage changes. Panel installation requires a 3.187 in circular cutout, and the rear barrier strip presents twelve numbered terminals for line, load, and control wiring. By closing or opening two independent SPDT contact sets on a fixed schedule, the device automates heaters, conveyors, or batching equipment that require repetitive start-stop sequences in industrial applications.
This timer is powered by a nominal 120 VAC supply and draws 2.5 VA, a low input burden that minimizes transformer loading in panels with multiple circuits. The synchronous motor is rated for a standard 60 Hz line, so no frequency adjustment is necessary in North American plants. Two output poles provide two SPDT contact sets, and each pole can switch up to a 10 A resistive load at 120 VAC. This capacity allows direct control of solenoids or pilot relays without interposing contactors. Contact life at the rated current is 250,000 operations, providing extended service in equipment that runs frequent cycles.
Cyclic precision is supported by a repeat accuracy of ±0.5% of the dial setting, helping the timer maintain consistent operating intervals from one cycle to the next. Overlap between adjacent functions is limited to 1.5% of the total cycle, ensuring consistent dwell periods in multistep processes. The mechanism has a mechanical life of 10,000,000 operations, allowing the cams and gearing to withstand prolonged repetitive use. Ambient operation is permitted from -20 °F to 140 °F, so the unit can be mounted in unconditioned enclosures or warm machinery housings.
