HG104A6 by Danaher

The HG104A6 is a single-function industrial timer produced by Danaher within the Timers and Controllers series. Designed for panel installation, the unit initiates and terminates machine sequences according to a preset dial, allowing conveyors, heaters, or indexing tables to run for a specified interval and then pause or change state. By closing or opening its internal relay contacts at precise moments, the timer provides predictable dwell periods that help coordinate multiple devices in an automated line.

In normal operation, the timer is energized from a control source of 120 VAC at 60 Hz; this removes the need for a separate transformer in most North American panels. Its circuitry draws only 2.5 VA, so heat rise inside an enclosure remains modest. The output relay can switch resistive loads up to 10 A at 120 V, supporting solenoids, contactors, or pilot lamps without an interposing relay. Dial calibration remains stable because repeat accuracy is held to 0.5% of the dial setting, minimizing drift between cycles. The front selector permits a minimum time setting of 10 seconds, and the design also allows a dwell or overlap period of 10 seconds when overlapping signals are required for sequencing.

The timing range reaches a maximum of 10 min, enabling moderately long process intervals without multiple cascaded timers. All switching is performed by two SPDT contacts, providing both normally open and normally closed paths for control logic. Reliable operation is maintained from -20 °F up to 140 °F, covering unheated equipment rooms and warm machinery cabinets. The housing measures 3.812 inches wide, 4.250 inches high, and 5.750 inches deep, allowing direct mounting in standard cutouts while leaving room behind the panel for wiring bends. These dimensions help the device fit into crowded control panels without obstructing adjacent hardware.